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

Gear Train Speed Ratio Calculator

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

Future Value Calculator

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

Frequency ⇄ Wavelength Converter (Hz/kHz/MHz/GHz/THz ⇄ m/cm/mm/nm)

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

Math & Numbers

Free Fall Calculator (h = ½gt²)

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

Math & Numbers

Force Calculator (F = m·a)

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

Math & Numbers

Gas Law Calculator

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

Function Equation Plotter

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

Math & Numbers

GB to Bytes

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

Math & Numbers

GB to GiB

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

Math & Numbers

GiB to GB

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

Math & Numbers

GB to Bits

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