Math & Numbers

Calculate the kinetic energy stored in a flywheel. E = ½·I·ω², ω = 2π·n/60. Enter the moment of inertia directly, or compute it from flywheel mass and radius (I = ½·m·r²). Supports J/kJ/Wh.

Math & Numbers

Calculate the gear ratio and output speed of a meshing gear pair. i = z₂/z₁ = n₁/n₂. Enter the tooth counts to get the ratio; add the driver speed to get the driven speed.

Math & Numbers

Calculate the overall ratio and output speed of a multi-stage gear train. i_total = i₁·i₂·…·iₙ (each i = z₂/z₁). Enter tooth pairs per stage and the input speed to get the final output speed.

Finance

Project today's amount (plus optional recurring contributions) forward with compound interest (FV). Supports a lump sum or lump sum + annuity, multiple compounding frequencies, a growth curve, and a per-period breakdown. FV = PV*(1+r)^n for a lump sum.

Math & Numbers

Convert between frequency and wavelength with selectable medium; results in all common frequency and length units

Math & Numbers

Compute distance, time, or final velocity for free fall from rest, given any one plus gravity

Math & Numbers

Compute force, mass, or acceleration from Newton's second law, with weight on Earth

Math & Numbers

Solve pressure, volume, temperature, or moles with the Ideal Gas Law (PV=nRT) or Combined Gas Law; also gas density and molar mass.

Math & Numbers

Plot one or more y=f(x) expressions, mark roots and extrema, and generate SVG-ready graph output

Math & Numbers

Convert gigabytes to bytes with decimal vs binary interpretation, alternate-system comparison, and network-speed-aware transfer estimates

Math & Numbers

Convert gigabytes to gibibytes with decimal vs binary interpretation, alternate-system comparison, and network-speed-aware transfer estimates

Math & Numbers

Convert gigabytes to bits with decimal vs binary interpretation, alternate-system comparison, and network-speed-aware transfer estimates