Unit Conversions Calculators

Convert between kg, lb, oz, g, stone, and all weight units instantly. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

cm, m, ft, in, mi and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

L, mL, gallons, cups and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert between km/h, mph, m/s, knots, and all speed units instantly. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Joules, calories, BTU and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Pa, psi, bar, atm and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Watts, horsepower, BTU/hr and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Newton, pound-force, dyne and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

kg/m³, g/cm³, lb/ft³ and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Degrees, radians, gradians. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

m/s², ft/s², g-force and more. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Look up all metric unit prefixes from yotta (10²⁴) to yocto (10⁻²⁴). Enter your value and unit — see the converted result with formula and equivalents. Free.

Convert litres to US or imperial gallons instantly. Enter your volume — get the gallon equivalent with the exact factor and comparison table. Free.

Convert US or imperial gallons to litres. Enter your volume — get the litre equivalent with other unit conversions. Free.

Convert miles per hour to kilometres per hour. Enter MPH — get KM/H with exact factor, pace equivalent, and reverse conversion. Free.

Convert kilometres per hour to miles per hour. Full formula with variable legend, worked example and step-by-step chemistry solution.

Convert watts to amperes at any voltage. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert amperes to watts at any voltage. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert pounds per square inch to bar. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert bar to PSI and other pressure units. Enter bar — get PSI, kPa, atm, mmHg, and Pa equivalents with the exact conversion factor. Free.

Convert acres to hectares and square metres. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert hectares to acres and square feet. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert stone to kilograms and pounds. Enter stone (and pounds optionally) — get kilograms and the full imperial-metric comparison. Free.

Convert kilograms to stone and pounds. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert nanometers to millimetres and microns. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert grams to avoirdupois or troy ounces. Enter grams — get ounces with the exact factor (1 g = 0.03527 oz) and pound equivalents. Free.

Convert ounces to grams with the exact factor (1 oz = 28.35 g). Enter ounces — get grams, pounds, and kilogram equivalents shown. Free.

Convert US cups to millilitres and litres. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert feet to metres with precision. Enter feet (and inches optionally) — get metres, centimetres, and millimetres. Free.

Convert miles to kilometres. Enter miles — get kilometres with the exact factor (1 mi = 1.60934 km) and reverse conversion. Free.

Convert kilometres to miles with precision. Enter kilometres — get miles using the exact factor (1 km = 0.6214 mi) plus reverse conversion. Free.

Convert joules to calories and kilocalories. Enter energy in joules — see calories, kcal, and kWh equivalents. Free.

Convert between joules, calories, and food Calories (kcal). Enter any energy value — see all major unit equivalents with conversion factors. Free.

Convert kilowatt-hours to joules and other energy units. Enter kWh — see joules, calories, BTU, and eV equivalents. Free.

Convert litres to US fluid ounces. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert miles per hour to metres per second. Full formula with variable legend, worked example and step-by-step chemistry solution.

Convert revolutions per minute to radians per second. Fast and accurate result with formula, step-by-step method and unit overview. Free tool.

Convert angular velocity between rev/s, rad/s, deg/s and rpm. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert moment of inertia between kg.m2, lb.ft2, and g.cm2. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert dynamic viscosity between Pa.s, cP, and kg/(m.s). Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert electrical conductance between siemens, mho, and S. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert magnetic flux between weber, maxwell, and Wb. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert specific heat capacity between J/(kg.K), cal/(g.C), and Btu/(lb.F). Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert thermal conductivity between W/(m.K), Btu/(hr.ft.F), and cal/(s.cm.C). Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert flow rate between m3/s, L/s, gal/min, and ft3/s. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert fuel efficiency between L/100km, mpg, km/L, and mi/L. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert radiation dose between Gy, rad, Sv, and rem. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert acoustic impedance between Pa.s/m, kg/(m2.s), and rayl. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.

Convert surface tension between N/m, mN/m, dyn/cm, and erg/cm2. Fast and accurate conversion with formula, worked examples and unit equivalents. Free online tool.