Quick reference

Popular unit conversions

Start with 30 frequently used conversion pairs. Each link opens a focused calculator with the exact formula, adjustable precision, common values, and an explanation of the units.

5 categories30 common pairsFree to use

6 starting points

Length

Everyday dimensions, height, construction, and travel distances across metric and customary systems.

All length converters →

Centimeter to Inch1 cm = 0.393701 inin = cm × 0.393701 Inch to Centimeter1 in = 2.54 cmcm = in × 2.54 Kilometer to Mile1 km = 0.621371 mimi = km × 0.621371 Mile to Kilometer1 mi = 1.609344 kmkm = mi × 1.609344 Meter to Foot1 m = 3.28084 ftft = m × 3.28084 Foot to Meter1 ft = 0.3048 mm = ft × 0.3048

6 starting points

Weight

Common mass comparisons for body weight, food, parcels, gemstones, and large shipments.

All weight converters →

Kilogram to Pound1 kg = 2.204623 lblb = kg × 2.204623 Pound to Kilogram1 lb = 0.453592 kgkg = lb × 0.453592 Gram to Ounce1 g = 0.035274 ozoz = g × 0.035274 Ounce to Gram1 oz = 28.349523 gg = oz × 28.349523 Stone to Kilogram1 st = 6.350293 kgkg = st × 6.350293 Metric ton to US short ton1 t = 1.102311 short tonshort ton = t × 1.102311

6 starting points

Temperature

Weather, cooking, and scientific scales converted with the required multiplier and offset.

All temperature converters →

Celsius to Fahrenheit1 °C = 33.8 °F°F = (°C × 9/5) + 32 Fahrenheit to Celsius1 °F = -17.222222 °C°C = (°F − 32) × 5/9 Celsius to Kelvin1 °C = 274.15 KK = °C + 273.15 Kelvin to Celsius1 K = -272.15 °C°C = K − 273.15 Fahrenheit to Kelvin1 °F = 255.927778 KK = (°F + 459.67) × 5/9 Kelvin to Fahrenheit1 K = -457.87 °F°F = (K × 9/5) − 459.67

6 starting points

Volume

Kitchen, fuel, storage, and cubic capacities with US and Imperial units kept distinct.

All volume converters →

Liter to US liquid gallon1 L = 0.264172 galgal = L × 0.264172 US liquid gallon to Liter1 gal = 3.785412 LL = gal × 3.785412 Milliliter to US fluid ounce1 mL = 0.033814 fl ozfl oz = mL × 0.033814 US customary cup to Milliliter1 cup = 236.588237 mLmL = cup × 236.588237 Cubic meter to Liter1 m³ = 1,000 LL = m³ × 1,000 Imperial gallon to Liter1 imp gal = 4.54609 LL = imp gal × 4.54609

6 starting points

Speed

Road, navigation, athletics, and scientific rates with both distance and time accounted for.

All speed converters →

Mile per hour to Kilometer per hour1 mph = 1.609344 km/hkm/h = mph × 1.609344 Kilometer per hour to Mile per hour1 km/h = 0.621371 mphmph = km/h × 0.621371 Knot to Kilometer per hour1 kn = 1.852 km/hkm/h = kn × 1.852 Meter per second to Kilometer per hour1 m/s = 3.6 km/hkm/h = m/s × 3.6 Foot per second to Meter per second1 ft/s = 0.3048 m/sm/s = ft/s × 0.3048 Speed of light to Kilometer per hour1 c = 1,079,252,848.8 km/hkm/h = c × 1,079,252,848.8

Answers at a glance

Frequently asked questions

Which unit conversions are most commonly used?

Common needs include centimeters and inches, kilometers and miles, kilograms and pounds, Celsius and Fahrenheit, liters and gallons, and miles per hour and kilometers per hour. The exact choice depends on region and task.

Are the conversion factors on this page exact?

Convr uses exact defined relationships whenever standards provide them and keeps full numeric precision during calculation. Displayed values are rounded for readability.

Can I enter my own value?

Yes. Open any listed conversion to use its interactive calculator, choose the displayed precision, review the formula, and compare common reference values.

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