| Engineering | Petroleum Engineering |
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| Chemical Engineering |
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| Mechanical Engineering |
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| Science | Biotechnology |
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| Nanotechnology |
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| Physics |
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| Chemistry |
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| Financial | Basic cashflow analysis |
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| Project selection/Capital allocation by Ranking method |
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| Measurement Units | Units Conversion Calculators |
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| Units Conversion factors |
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| Drilling | Surge & Swab pressures |
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| Bit Hydraulics Optimization |
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| Cuttings Slip Velocity |
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| Equivalent Circulation Density Of Mud |
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| Basic solids analysis |
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| Drilling rate d-Exponent |
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| Directional survey |
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| Well Schematic I - Single vertical completion |
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| Well Schematic II - Dual vertical completion |
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| Well Schematic III - Horizontal single completion |
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| Casing Data Browser |
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| Reservoir I | Material Balance Equation I: SolutionGas- GasCap Drive |
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| Material Balance Equation II: SolutionGas with GasCap Withdrawal/Injectio n |
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| Pressure Buildup Analysis - Horner Plot (Oilwell) |
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| Inflow Performance Relationships For solution-gas drive Vertical wells |
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| Inflow Performance Relationships For solution-gas drive Horizontal wells |
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| Horizontal well performance (oil) |
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| Water coning in a vertical well |
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| Water breakthrough time in a vertical well |
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| Reservoir II - Gas | Original Gas In Place: Volumetric reservoir - p/z method |
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| Original Gas In Place: Abnormally Pressured gas reservoir |
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| Coalbed Methane: Original Gas In Place by P/Z* method |
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| Coalbed Methane: Reservoir performance prediction |
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| Gaswell deliverability - Backpressure AOF test |
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| Horizontal well performance (gas) |
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| Gas Properties - I: Z, μ, Bg and Sg for a given Composition |
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| Gas Properties - II: Z, μ, Bg for a given Specific gravity |
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| Real gas pseudo-pressure |
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| Gas coning in a vertical well |
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| Production | Decline Curve Analysis |
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| Flow through chokes (1-phase) |
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| Flow through chokes (2-phase) |
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| Gaswell flow in Vertical Tubing |
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| Gas flow in Horizontal Pipeline |
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| Gas flow in Inclined Pipeline |
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| API Gravity Correction to 60°F |
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| Gas well load-up: Critical Rate |
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| Tubing Data Browser |
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| Skin Factors In Perforated Vertical Wells |
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| Skin Factors In Perforated Horizontal Wells |
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| Productivity Ratio Of Perforated Horizontal Wells |
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| Geosciences | Contouring |
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| Conventional well log analysis I |
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| Conventional well log analysis II |
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| Economics | Basic cashflow analysis |
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| Comprehensive cashflow analysis (oilfield) |
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| Comprehensive cashflow analysis (gasfield) |
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| "Optimum" number of Oilfield development wells |
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| Project selection/Capital allocation by Ranking method |
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| Miscellaneous | Units Conversion Calculators |
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| Units Conversion factors |
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| World Oil & Gas Production & Reserves - Country by country Data |
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| Mechanical Engineering Calculators |
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| Civil Engineering Calculators |
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| Physical Properties | Physical properties of Water |
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| Liquid-phase Diffusion coefficients |
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| Gas Z-factor, Viscosity & Specific Gravity for a given Composition |
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| Gas Z-factor & Viscosity for a given Specific gravity |
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| API gravity Correction To 60°F |
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| Fluid Flow | Reynolds Number and Friction Factors |
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| Vapor-Liquid 2-Phase Vertical downflow |
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| Flow Through Packed Bed |
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| Liquid Pipe flow: Pressure Drop calculation |
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| Liquid Pipe flow: Pipe Length calculation |
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| Liquid Pipe flow: Flow Rate calculation |
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| Liquid Pipe flow: Pipe Diameter calculation |
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| Gas flow in Horizontal Pipeline |
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| Gas flow in Inclined Pipeline |
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| Heat Transfer | Shell & Tube Heat Exchanger: Corrected LMTD |
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| Air-cooled Heat Exchanger Design |
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| Equipment Sizing | Sizing Of Liquid-Vapor Separators |
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| Partial Volumes Of Tanks |
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| Orifice Sizing for fluid flow |
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| Gas Compressor performance |
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| Mass Transfer | |
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| Packed-Tower Sizing |
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| Economics | Basic cashflow analysis |
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| Project selection/Capital allocation by Ranking method |
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| Measurement Units | Units Conversion Calculators |
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| Units Conversion factors |
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| Other Calculators | |
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| Chemistry Calculators |
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| Mechanical Engineering Calculators |
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| Civil Engineering Calculators |
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| Machine Mechanics | Rolling Wheel |
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| Motion of Crank-Slider Mechanism |
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| Buckling of Helical Spring |
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| Bolt & Nut Bolted Joint: Stiffnesses of components |
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| Cap Screw Bolted Joint: Stiffnesses of components |
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| Bolted Joint: Static and Dynamic loading |
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| Butt Weld under axial and transverse loading |
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| Fillet Weld under Torsional loading |
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| Fillet Weld under Bending loading |
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| Material Stresses | Pressure loading: Thin-walled vessels (Sphere & Cylinder) |
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| Pressure loading: Thick-walled Cylinder |
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| Stresses due to Interference (press or shrink) fit |
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| Contact stresses: Sphere on a sphere |
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| Contact stresses: Sphere on a Flat surface |
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| Contact stresses: Cylinder on a cylinder |
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| Contact stresses: Cylinder on a Flat surface |
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| Rotational loading: Thin disk |
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| 2D Stresses & Mohr's Circle |
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| 3D Stresses & Mohr's Circles |
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| Static Failure analysis: Ductile material |
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| Static Failure analysis: Brittle material |
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| Buckling of Column with Rectangular cross-section |
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| Buckling of Column with Circular cross-section |
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| Fatigue & dynamic Failure analysis |
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| Stress Concentration factors: Two U-Notches in a Rectangular member |
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| Stress Concentration factors: Circular Hole in a Rectangular member |
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| Stress Concentration factors: U-Notch in a Circular shaft |
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| Stress Concentration factors: Square Shoulder with Fillet in a Circular shaft |
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| Stress Concentration factors: Radial Hole in hollow or solid Circular shaft |
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| Fluid Flow | Reynolds Number and Friction Factors |
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| Liquid Pipe flow: Pressure Drop calculation |
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| Liquid Pipe flow: Pipe Length calculation |
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| Liquid Pipe flow: Flow Rate calculation |
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| Liquid Pipe flow: Pipe Diameter calculation |
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| Gas Z-factor, Viscosity & Specific Gravity for a given Composition |
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| Gas Z-factor & Viscosity for a given Specific gravity |
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| Gas flow in Horizontal Pipeline |
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| Gas flow in Inclined Pipeline |
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| Forces on a pipe bend |
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| Heat Transfer | |
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| Vibrations | Critical Speed of a Multi-Rotor System |
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| Metalworking | Hardness-To- Hardness Conversion |
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| Sheet metal Bend Deduction & Allowance |
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| Economics | Basic cashflow analysis |
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| Project selection/Capital allocation by Ranking method |
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| Beam Flexure | Simply-supported beam with concentrated Force at intermediate point |
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| Simply-supported beam with concentrated Couple at intermediate point |
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| Simply-supported beam with Uniform Distributed load |
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| Simply-supported beam with Triangular Distributed load |
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| Simply-supported beam with Twin concentrated Forces |
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| Simply-supported beam with Single overhang and concentrated Force at free end |
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| Simply-supported beam with Single overhang and uniform Distributed load |
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| Simply-supported beam with Double overhang and concentrated Forces both ends |
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| Simply-supported beam with Double overhang and Distributed load |
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| Simply-supported beam with Multiple and Varied loading: I |
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| Simply-supported beam with Multiple and Varied loading: II |
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| Cantilevered beam with concentrated Force at intermediate point |
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| Cantilevered beam with concentrated Couple at intermediate point |
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| Cantilevered beam with Uniform Distributed load |
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| Cantilevered beam with Triangular Distributed load |
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| Miscellaneous | Units Conversion Calculators |
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| Units Conversion factors |
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| Petroleum Engineering Calculators |
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| Civil Engineering Calculators |
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| Chemical Engineering Calculators |
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| Structure I | Simply-supported beam with concentrated Force at intermediate point |
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| Simply-supported beam with concentrated Couple at intermediate point |
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| Simply-supported beam with Uniform Distributed load |
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| Simply-supported beam with Triangular Distributed load |
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| Simply-supported beam with Twin concentrated Forces |
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| Simply-supported beam with Single overhang and concentrated Force at free end |
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| Simply-supported beam with Single overhang and uniform Distributed load |
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| Simply-supported beam with Double overhang and concentrated Forces both ends |
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| Simply-supported beam with Double overhang and Distributed load |
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| Simply-supported beam with Multiple and Varied loading: I |
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| Simply-supported beam with Multiple and Varied loading: II |
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| Cantilevered beam with concentrated Force at intermediate point |
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| Cantilevered beam with concentrated Couple at intermediate point |
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| Cantilevered beam with Uniform Distributed load |
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| Cantilevered beam with Triangular Distributed load |
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| Structure II | Fixed Frame With Concentrated Force At Any Point On Girder |
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| Hinged Frame With Concentrated Force At Any Point On Girder |
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| Fixed Frame With Distributed Force On Girder |
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| Hinged Frame With Distributed Force On Girder |
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| Fixed Parabolic Arch With Concentrated Force |
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| Two-Hinged Parabolic Arch With Concentrated Force |
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| Fixed Parabolic Arch With Distributed Force |
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| Two-Hinged Parabolic Arch With Distributed Force |
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| Triangular Truss Under Concentrated Forces |
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| Bridge Truss Under Concentrated Forces |
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| Cantilever Truss Under Concentrated Forces |
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| 2D Stresses & Mohr's Circle |
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| 3D Stresses & Mohr's Circles |
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| Static Failure analysis: Ductile material |
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| Static Failure analysis: Brittle material |
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| Buckling of Column with Rectangular cross-section |
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| Buckling of Column with Circular cross-section |
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| Structure III | Concrete Mix Job |
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| Geotechnical | Physical Properties of Soils |
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| Stresses In Soils Due To Concentrated Surface Load |
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| Soil Consolidation And Settlement |
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| Transportation |
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| Hydraulics | Reynolds Number and Friction Factors |
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| Liquid Pipe flow: Pressure Drop calculation |
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| Liquid Pipe flow: Pipe Length calculation |
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| Liquid Pipe flow: Flow Rate calculation |
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| Liquid Pipe flow: Pipe Diameter calculation |
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| Forces on a pipe bend |
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| Hydrology | Groundwater flow to a well |
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| Economics | Basic cashflow analysis |
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| Project selection/Capital allocation by Ranking method |
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| Miscellaneous | Units Conversion Calculators |
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| Units Conversion factors |
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| Mechanical Engineering Calculators |
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| Petroleum Engineering Calculators |
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| General | pH & pOH Of Aqueous Solution |
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| Cell Growth |
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| Nucleic Acids | Concentration Of Nucleic Acids |
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| Molecular Weight of DNA Molecule |
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| Polymerase Chain Reaction | Melting Temperature of DNA Strand |
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| Proteins | Protein Quantification |
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| Centrifugation | Relative Centrifugal Force |
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| Sedimentation Time |
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| Measurement Units | Particulate Density Units Conversion |
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| Miscellaneous | Nanotechnology Calculators |
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| Chemistry Calculators |
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| Chemical Structure | Molecular Modeling |
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| Particle Properties | Surface Areas & Volumes |
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| Aerodynamic Diameter |
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| Settling Velocity |
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| Processing | Energy Requirement In Size-Reduction Operation |
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| Measurement Units | Particulate Density Units Conversion |
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| Miscellaneous | Chemistry Calculators |
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| Chemical Engineering Calculators |
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| Mechanics | Vector addition |
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| Newton's laws of motion |
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| Equilibrium of rigid body under coplanar forces |
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| Simple machines |
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| Heat | Thermal expansion |
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| Kinetic theory |
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| Sound | Speed of sound in gases |
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| Doppler Effect |
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| Electricity | Alternating current |
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| Electric fields |
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| Light | Reflection & Spherical Mirrors |
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| Nuclear | Hydrogen atom energy levels |
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| Nuclear Fission |
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| Measurement Units | Units Conversion Calculators |
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| Miscellaneous | Chemistry Calculators |
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| Mechanical Engineering Calculators |
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| Other Calculators |
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| Atomic Structure | Periodic Table of Elements |
| Formulas&Composition | Hydrochloric Acid Preparation |
| Gases | Molar Mass of a gas |
| Calorimetry | Heat & Change Of Phase Of Water |
| Concentration&Solutions | Dilution Of Solutions |
| Osmotic Pressure |
| Acids & Bases | Acid-Base Titration |
| Equilibrium Constant |
| Electrochemistry | Faraday's Laws of Electrolysis |
| Chemical Kinetics | Arrhenius equation & Reaction rates |
| Measurement Units | Units Conversion Calculators |
| Units Conversion factors |
| Miscellaneous | Chemical Engineering Calculators |
| Physics Calculators |
| Other Calculators |
