# Unit Conversion calculators

> Length, mass, temperature, area, volume, speed, time, data, energy, pressure, power, angle, fuel economy and more.

18 calculators. HTML index: https://tttkmbb.com/conversion · JSON: https://tttkmbb.com/api/v1/calculators?category=conversion

- [Length Converter](https://tttkmbb.com/conversion/length.md): Converts a length or distance between metric (nm to km), imperial/US (in, ft, yd, mi), nautical and astronomical units using exact NIST factors (1 in = 0.0254 m, 1 mi = 1609.344 m). Tool: `convert_length`.
- [Mass / Weight Converter](https://tttkmbb.com/conversion/mass.md): Converts mass between metric units (μg to tonne), avoirdupois units (grain, oz, lb, stone, short and long ton) and carats using the exact definition 1 lb = 0.45359237 kg. Tool: `convert_mass`.
- [Temperature Converter](https://tttkmbb.com/conversion/temperature.md): Converts temperatures between Celsius, Fahrenheit, Kelvin and Rankine with the exact defining relations (°F = °C × 9/5 + 32, K = °C + 273.15, °R = °F + 459.67) and rejects values below absolute zero. Tool: `convert_temperature`.
- [Area Converter](https://tttkmbb.com/conversion/area.md): Converts areas between metric (mm² to km², hectare) and US/imperial units (in², ft², yd², acre, mi²) using exact factors (1 ft² = 0.09290304 m², 1 acre = 4046.8564224 m²). Tool: `convert_area`.
- [Volume Converter](https://tttkmbb.com/conversion/volume.md): Converts volumes between metric units (mL, L, cm³, m³), US customary units (tsp to gallon, in³, ft³, yd³, oil barrel), imperial units (fl oz, pint, quart, gallon) and metric kitchen units, with exact definitions (1 US gal = 3.785411784 L, 1 imperial gal = 4.54609 L). Tool: `convert_volume`.
- [Speed Converter](https://tttkmbb.com/conversion/speed.md): Converts speeds between m/s, km/h, km/s, mph, ft/s, knots and Mach number using exact factors (1 mph = 0.44704 m/s, 1 kn = 1852/3600 m/s) and 340.294 m/s for Mach 1 at sea level. Tool: `convert_speed`.
- [Time Converter](https://tttkmbb.com/conversion/time.md): Converts durations between nanoseconds, microseconds, milliseconds, seconds, minutes, hours, days, weeks, fortnights, 30-day months, 365-day years and Julian years (365.25 days). Tool: `convert_time`.
- [Data Storage Converter](https://tttkmbb.com/conversion/data-storage.md): Converts digital storage and transfer sizes between bits, bytes, decimal SI multiples (KB = 1000 B, MB, GB, TB, PB), binary IEC multiples (KiB = 1024 B, MiB, GiB, TiB, PiB) and kilobit/megabit/gigabit/terabit. Tool: `convert_data_storage`.
- [Energy Converter](https://tttkmbb.com/conversion/energy.md): Converts energy between joules (J to GJ), calories (thermochemical cal = 4.184 J, kcal), watt-hours (Wh, kWh, MWh), BTU (International Table, 1055.05585262 J), MMBTU, therm (EC), electronvolts, ergs and foot-pounds. Tool: `convert_energy`.
- [Pressure Converter](https://tttkmbb.com/conversion/pressure.md): Converts pressure between pascals (Pa to MPa), bar/millibar, standard atmospheres, psi and ksi, millimetres and inches of mercury, torr and technical atmospheres (kgf/cm²) using NIST factors (1 psi = 6894.757293168 Pa, 1 atm = 101325 Pa). Tool: `convert_pressure`.
- [Power Converter](https://tttkmbb.com/conversion/power.md): Converts power between watts (W to GW), mechanical horsepower (745.69987158227 W), metric horsepower (735.49875 W), BTU per hour, foot-pounds per second, kcal/h and tons of refrigeration. Tool: `convert_power`.
- [Angle Converter](https://tttkmbb.com/conversion/angle.md): Converts plane angles between degrees, radians, milliradians, gradians (gon), arcminutes, arcseconds and turns (revolutions) using π rad = 180° = 200 gon = 0.5 turn. Tool: `convert_angle`.
- [Fuel Economy Converter](https://tttkmbb.com/conversion/fuel-economy.md): Converts fuel consumption between litres per 100 km, kilometres per litre, miles per US gallon and miles per imperial gallon; L/100km is the base and the mpg relations are reciprocal (L/100km = 235.214583 / mpg_US). Tool: `convert_fuel_economy`.
- [Force Converter](https://tttkmbb.com/conversion/force.md): Converts force between newtons (N, kN), dynes, gram-force, kilogram-force (kilopond), ounce-force, pound-force and kips using exact factors (1 lbf = 4.4482216152605 N, 1 kgf = 9.80665 N). Tool: `convert_force`.
- [Frequency Converter](https://tttkmbb.com/conversion/frequency.md): Converts frequency and rotational speed between hertz (Hz to THz), revolutions per minute, beats per minute, radians per second (angular frequency, ω = 2πf) and degrees per second. Tool: `convert_frequency`.
- [Density Converter](https://tttkmbb.com/conversion/density.md): Converts density between kg/m³, g/cm³, g/mL, kg/L, g/L, mg/L, lb/ft³, lb/in³, oz/in³ and lb per US gallon using exact mass and volume definitions (1 lb/ft³ = 16.01846337 kg/m³). Tool: `convert_density`.
- [Torque Converter](https://tttkmbb.com/conversion/torque.md): Converts torque (moment of force) between N·m, kN·m, N·cm, mN·m, lbf·ft, lbf·in, kgf·m, kgf·cm and ozf·in using exact force and length definitions (1 lbf·ft = 1.3558179483 N·m). Tool: `convert_torque`.
- [Cooking Measurement Converter](https://tttkmbb.com/conversion/cooking-measurements.md): Converts kitchen volume measures between US customary teaspoons, tablespoons, fluid ounces, cups, pints, quarts and gallons, metric teaspoons (5 mL), tablespoons (15 mL) and cups (250 mL), imperial fluid ounces and pints, and millilitres/litres. Tool: `convert_cooking_measurements`.