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Unit conversion: exact factors, US vs UK gallons, KB vs KiB

Updated: 14 November 2026

Open the unit converter

Unit conversion is exact when you use the official definitions. An inch is defined as exactly 2.54 cm and a pound as exactly 0.45359237 kg, so conversions between metric and imperial units need no rounding until the end. The common errors come from units that share a name but differ in size.

Quick answer

  • 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg (all exact).
  • 5 feet 6 inches = 167.64 cm. 30 °C = 86 °F.
  • A US gallon is 3.785411784 litres; a UK (imperial) gallon is 4.54609 litres.
  • 1 KB = 1,000 bytes, but many websites and Windows treat “KB” as 1,024 bytes (a KiB). 200 KiB = 204,800 bytes.

Exact definitions used

UnitExact value
1 inch2.54 cm
1 foot0.3048 m
1 mile1.609344 km
1 pound0.45359237 kg
1 US gallon231 cubic inches = 3.785411784 litres
1 imperial (UK) gallon4.54609 litres
1 acre43,560 square feet
Temperature°F = °C × 9/5 + 32; K = °C + 273.15

Two gallons with one name

A recipe, fuel figure or tank size from the US uses the US gallon; one from the UK uses the imperial gallon, about 20% bigger. Check the source before converting.

KB, KiB and upload limits

Strictly, KB, MB and GB are powers of 1,000, and KiB, MiB and GiB are powers of 1,024. Many upload forms say “KB” but count 1,024 bytes. A file of 200,000 bytes is safely under either reading of “200 KB”; a file of 204,000 bytes passes one reading and fails the other. Keep a small margin. The site’s compress image to KB tool leaves one. See also pixels, KB and DPI.

What is not included

Traditional Indian land units such as bigha, gunta or cent vary from state to state, so they are not converted here. Check your state’s land records office.

How to use the unit converter

  1. Choose what you are converting: length, weight, temperature, area, volume, speed or data size.
  2. Type the value and pick its unit.
  3. Read the main result, or the table of every unit at once.

Writing an amount on a cheque? See amount in words.

Limits

Results are rounded for display. Land units, currency and cooking “cups” (which vary by country) are not covered.

Sources

If this page and the official notice disagree, follow the notice.

FAQ

How many cm is 5 feet 6 inches?
167.64 cm, using 1 inch = 2.54 cm exactly.
How do I convert Celsius to Fahrenheit?
°F = °C × 9/5 + 32. 30 °C is 86 °F.
Why do US and UK gallons differ?
They are different units with the same name: about 3.785 litres and 4.546 litres.
Is 1 KB 1,000 or 1,024 bytes?
Strictly 1,000. 1,024 bytes is a KiB, but many websites and Windows label it KB. Keep files a little under the limit.
Can it convert bigha or gunta?
No. These vary by state. Check your state’s land records office.

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