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Multi-Unit Converter

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Convert between metric and US units in one place. Pick a measurement, enter a value and choose the units to see the result, the exact formula, the reverse conversion and the value in every other unit.

By the CalcKite team · Last reviewed 19 Oct 2026 · Formula · Cite · Embed

Multi-Unit Converter

Convert length, weight, temperature, volume, area, speed and data units with exact conversion factors, the formula and every related unit at once.

Value in new unit = value × (size of the old unit ÷ size of the new unit) 1 inch = 2.54 cm exactly; 1 mile = 1.609344 km; 1 lb = 0.45359237 kg Temperature: °F = °C × 9/5 + 32; K = °C + 273.15

Example: Common conversions. 1 mile: 1.609344 km; 0 °C: 32 °F; 100 °F: 37.78 °C; 1 lb: 0.4536 kg; 1 US gallon: 3.7854 L; 1 GB: 0.9313 GiB.

Understand the resultHow it works, worked example, formula and FAQ
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How to use the Multi-Unit Converter

Choose what you’re measuring: length, weight, temperature, volume, area, speed or digital storage. Enter the value and pick the unit you have and the unit you want. Set how many decimal places to show. The green box shows the answer, the rows show the formula and the reverse, and the table lists the value in every unit of that type.

Worked example

Common conversions

1 mile1.609344 km
0 °C32 °F
100 °F37.78 °C
1 lb0.4536 kg
1 US gallon3.7854 L
1 GB0.9313 GiB

Assumptions and limits

  • Conversion factors are exact international definitions where they exist.
  • Volume units are US measures unless marked UK.
  • Temperature is converted with offsets, not just multiplication.
  • Only units of the same kind can be converted.

Formula

Value in new unit = value × (size of the old unit ÷ size of the new unit) 1 inch = 2.54 cm exactly; 1 mile = 1.609344 km; 1 lb = 0.45359237 kg Temperature: °F = °C × 9/5 + 32; K = °C + 273.15

Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply by 9/5 and add 32. 20 °C × 9/5 + 32 = 68 °F.

How many kilometres are in a mile?

Exactly 1.609344 kilometres, so 10 miles is about 16.09 km.

What’s the difference between GB and GiB?

A GB is 1,000,000,000 bytes and a GiB is 1,073,741,824 bytes. That is why a 1 TB drive shows as about 931 GiB on a computer.

Cite or link to this calculator

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CalcKite. (2026). Multi-Unit Converter [Online calculator]. https://www.calckite.com/unit-conversion-calculator/

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