All Converters
16 unit converters, 11 converter tools and 60 conversion charts. Search to jump to one.
Length & Distance
e.g. mm, cm, m, km, in, ft, yd, mi
Weight & Mass
e.g. g, kg, lb, oz, stone
Temperature
e.g. °C, °F, K, °R
Volume & Liquid
e.g. ml, L, gal, cup, oz
Area
e.g. m², ft², acre, hectare
Speed
e.g. mph, kph, m/s, knots
Time
e.g. ms, s, min, hr, day, year
Energy
e.g. J, kJ, cal, kcal, kWh, BTU
Power
e.g. W, kW, hp, PS, BTU/h, tons
Pressure
e.g. psi, bar, kPa, atm
Density
e.g. kg/m³, g/cm³, g/mL, lb/ft³, lb/gal
Data Storage
e.g. KB, MB, GB, TB, KiB, MiB
Currency
e.g. USD, EUR, GBP, JPY +
Number Base
e.g. binary, decimal, hex, octal
Color Code
e.g. HEX, RGB, HSL, CMYK, HSV
Angle
e.g. degrees, radians, gradians
Converter tools
Time to Decimal Hours
7:45 → 7.75 hours, and back
Fraction ↔ Decimal ↔ Percent
3/8 = 0.375 = 37.5%, nearest 1/16
Fuel Economy Converter
mpg (US/UK) ↔ L/100 km ↔ km/L
Roman Numeral Converter
1994 ↔ MCMXCIV
Time Zone Converter
Your time in New York, London, Tokyo…
Shoe Size Converter
US men's & women's ↔ UK ↔ EU ↔ JP ↔ foot length
Torque Converter
N·m ↔ lb·ft ↔ lb·in ↔ kgf·m, plus horsepower at rpm
Watts to Amps Converter
W → A at any voltage, DC, single- or three-phase
Military Time Converter
1430 ↔ 2:30 PM, with a 24-hour chart
Scientific Notation Converter
123000 ↔ 1.23 × 10⁵, E notation, engineering + SI prefix
Number to Words Converter
1,234.56 → words, cheque wording, dollars & cents
Popular conversions with charts
- Centimeters to Inches (cm to in)
- Inches to Centimeters (in to cm)
- Kilograms to Pounds (kg to lbs)
- Pounds to Kilograms (lbs to kg)
- Fahrenheit to Celsius (°F to °C)
- Celsius to Fahrenheit (°C to °F)
- Feet to Meters (ft to m)
- Meters to Feet (m to ft)
- Kilometers to Miles (km to mi)
- Miles to Kilometers (mi to km)
- Millimeters to Inches (mm to in)
- Inches to Millimeters (in to mm)
- Cubic Feet to Gallons (ft³ to gal)
- Milliliters to Fluid Ounces (ml to fl oz)
- Fluid Ounces to Milliliters (fl oz to ml)
- Cups to Milliliters (cups to ml)
- Gallons to Liters (gal to L)
- Liters to Gallons (L to gal)
- Grams to Ounces (g to oz)
- Ounces to Grams (oz to g)
- Miles per Hour to Kilometers per Hour (mph to km/h)
- Kilometers per Hour to Miles per Hour (km/h to mph)
- Kilopascals to PSI (kPa to psi)
- PSI to Bar
- Bar to PSI
- Acres to Square Feet (ac to ft²)
- Square Feet to Square Meters (sq ft to m²)
- Watts to Horsepower (W to hp)
- Horsepower to Watts (hp to W)
- PSI to Atmospheres (psi to atm)
- Ounces to Pounds (oz to lbs)
- Minutes to Years
- Inches to Feet (in to ft)
- Feet to Inches (ft to in)
- Centimeters to Feet (cm to ft)
- Grams to Pounds (g to lbs)
- Pounds to Ounces (lbs to oz)
- Ounces to Cups (fl oz to cups)
- Square Feet to Acres (sq ft to ac)
- Square Meters to Square Feet (m² to sq ft)
- Quarts to Cups (qt to cups)
- Cups to Ounces (cups to fl oz)
- Milliliters to Cups (ml to cups)
- Pints to Cups (pt to cups)
- Feet to Yards (ft to yd)
- Yards to Feet (yd to ft)
- Meters to Yards (m to yd)
- Liters to Cups (L to cups)
- Quarts to Gallons (qt to gal)
- Kilograms to Grams (kg to g)
- Knots to Miles per Hour (kn to mph)
- Meters per Second to Miles per Hour (m/s to mph)
- Kelvin to Celsius (K to °C)
- Celsius to Kelvin (°C to K)
- Megabytes to Gigabytes (MB to GB)
- Gigabytes to Megabytes (GB to MB)
- Kilobytes to Megabytes (KB to MB)
- Gigabytes to Terabytes (GB to TB)
- Hectares to Acres (ha to ac)
- Seconds to Hours (s to h)
Which converter do you need?
The unit converters at the top handle every unit inside one measurement family. Pick the family first (length, weight, volume, pressure and so on), then choose any two units in it, so you are never limited to a single pair. The converter tools cover conversions that are not a simple multiplication: temperature scales with different zero points, time zones, shoe sizes that follow regional size charts, and number bases. The conversion charts are the everyday pairs people look up most, each with a ready-made table you can print or keep open while you work.
Three mix-ups worth checking first
- Weight or volume? Cups, millilitres and fluid ounces measure volume; grams, ounces and pounds measure weight. Moving between the two needs the ingredient's density, which is what the density converter is for.
- US or imperial? Gallons, pints and fluid ounces have different sizes in the US and UK systems. The volume converter lists both, so check which one your recipe, fuel figure or product label uses.
- Rounding. Results show several decimal places so you can round to suit the job: whole numbers for a shopping list, more precision for engineering or lab work.
Every converter runs in your browser and needs no sign-up. For background on how the systems fit together, read metric vs imperial explained or browse the blog.