Energy Conversions

A comparative reference of energy quantities — from a kg of battery to world energy use — expressed in kWh, MJ, or BTU.

Acceleration Calculator

Compute wheel force and acceleration in each gear from engine torque, gear ratios, differential ratio, tire size, and vehicle weight.

Thermal Expansion Calculator

Compute thermal elongation, strain, and induced stress for constrained members across eight common engineering materials.

Pipe Flow Calculator

Full-range pipe flow — Hagen-Poiseuille for laminar and Darcy-Weisbach with Colebrook-White for turbulent, both shown simultaneously with a live Moody diagram.

Accumulator Sizing

Find needed minimum accumulator size given pressures and the size of the cyclinder being used

Hoop Stress

Lamé equations for stress distribution through a thick-walled cylinder — tangential, radial, longitudinal, and Von Mises stress with safety factor

Conduction — Flat Plate

Fourier's Law for steady-state conduction — computes heat transfer rate, thermal resistance, and heat flux across 28 common engineering materials.

Conduction — Cylinder

Radial conduction through a hollow cylinder — computes heat transfer rate, thermal resistance, and inner wall heat flux across 28 engineering materials.

Convection Coefficient

Calculate the coefficient of convective heat transfer of water or oil flowing through a pipe.

Bearing L10 Life

ISO 281 bearing life calculations — compute expected L10 life from a known dynamic load rating, or find the required rating for a target service life.

Shaft Stress — Torsion

Torsional shear stress for solid and hollow shafts — computes applied stress from torque, max allowable torque, and keyway stress concentration effects.

Torque Calculator

Convert between power, speed, and torque — power + speed to torque, or torque + speed to power, across hp, kW, in·lb, ft·lb, and N·m.

Heat-Up Calculator

Find required power to heat a mass in a target time, or find required time given available power — for water, Therminol 66, ISO 220, steel, and aluminum.

Fluid Power Calculator

Calculate thermal power from flow rate and temperature change for water, ISO 220, ISO 320, and Therminol 66 — results in kW, hp, and BTU/hr.

Fastener Preload

VDI 2230 torque-preload for standard bolts and SHCS — accounts for both thread and bearing face friction, with torque specs by grade at 75/85/90% proof load.

Power Screw Calculator

Axial force, efficiency, and self-locking analysis for ACME, square, and large-thread power screws — jacks, clamps, presses, and lead screws.

Gear Design Calculator

Get gear geometery and stress given tooth size, mating gear and input torque.

Hydraulic Diameter Calculator

Get equivalent diameter for a number of shapes.