Stress and Pressure Converter

Moment of Inertia Converter

Convert the second moment of area (mm⁴, cm⁴, in⁴, ft⁴) and the mass moment of inertia (kg·m², lb·ft², slug·ft²) with exact factors and steps.

Length Converter

Convert lengths ( mm, cm, m, km, in, ft, yd, mi, ...) between metric and U.S. units, including feet and inches, with exact factors and the conversion steps shown.

Area Converter

Convert areas between mm², cm², m², in², ft², acres, hectares and more, with exact factors and the conversion steps shown.

Unit Conversion Method Examples and Conversion Tables

Convert any unit with ratios equal to 1: step-by-step examples from length to temperature, and full conversion tables for 12 engineering quantities.

Force Converter

Convert forces between newtons, kilonewtons, pound-force, kips, kilogram-force and more, with exact factors and the conversion steps shown.

Temperature Converter

Convert temperatures between °C, °F, K and °R, and temperature differences without the offset, with the formulas shown step by step.

Time Converter

Convert time between nanoseconds, seconds, minutes, hours, days, weeks and years, or split a duration into hours, minutes and seconds.

Volume Converter

Convert volumes between mL, liters, m³, in³, ft³, U.S. and imperial gallons and more, with exact factors and the conversion steps shown.

Angle Converter

Convert angles between degrees, radians, degrees-minutes-seconds, gradians and turns, with exact π-based factors and the steps shown.

Moment and Torque Converter

Convert moments and torques between N·m, N·mm, kN·m, lbf·in, lbf·ft, kip·ft, kgf·m and more, with exact factors and the steps shown.

Velocity Converter

Convert speeds between m/s, km/h, ft/s, mph and knots, and rotational speeds between rpm and rad/s, with the conversion steps shown.

Calculations with SI Prefixes

Concrete Slab: Weight, Floor Load and Equivalent Steel Plate

Units in Statics Si US Customary and Conversion

How force, mass and length units fit together through F = ma, how to convert between SI and U.S. units, and how to write SI correctly.

Mass and Weight of a Machine Part

Weight of a Crate in Newtons

Calculations with SI Prefixes

Gravitational Constant in U.S. Customary Units

Moment of a Force in kip·ft and kN·m

Mass of a Crate from F = ma in U.S. Units