Free Engineering Calculators

Free metric thread calculator. Look up thread dimensions, pitch diameters, tolerances, and tap drill sizes for standard metric threads.

Free bolt torque calculator. Calculate required torque for bolts based on size, grade, and friction coefficient. Supports metric and imperial fasteners.

Free material specifications database. Look up mechanical properties, chemical composition, and equivalent grades for steels, aluminum, titanium, and more.

Free trigonometry calculator. Calculate sine, cosine, tangent, and inverse trig functions. Supports degrees and radians with visual triangle diagrams.

Find the right refrigerant based on legislation, region, and application.

Side-by-side refrigerant comparison: GWP, ODP, safety, and properties.

Searchable GWP database for 40+ refrigerants with CO2e calculator.

Calculate CO2e from refrigerant leaks, electricity, and fuel usage.

Decode resistor color bands and convert values to colors.

Decode capacitor codes, calculate series/parallel capacitance.

T568A/T568B pinout, crossover cables, and color reference.

Cat5e-Cat8 specs, PoE reference, and cable length calculator.

Battery runtime, capacity sizing, and electricity cost.

Pipe flow rate, velocity & Reynolds number.

Hydrostatic pressure, pump head & force.

Pipe pressure drop & drag force in water.