Quick-reference chart converting common length, weight, volume, and area units between metric and imperial/US systems.
Metric Equivalent: 2.54 cm
Metric to Imperial Conversion Chart
Category
Imperial / US Unit
Metric Equivalent
Length
1 inch
2.54 cm
Length
1 foot
30.48 cm
Length
1 yard
0.9144 m
Length
1 mile
1.60934 km
Weight
1 ounce
28.3495 g
Weight
1 pound
0.453592 kg
Weight
1 stone
6.35029 kg
Volume
1 fl oz (US)
29.5735 ml
Volume
1 cup (US)
236.588 ml
Volume
1 pint (US)
473.176 ml
Volume
1 quart (US)
946.353 ml
Volume
1 gallon (US)
3.78541 L
Area
1 sq foot
0.092903 sq m
Area
1 acre
0.404686 hectares
Speed
1 mph
1.60934 km/h
Temperature
32°F (freezing)
0°C
Temperature
212°F (boiling)
100°C
How to Measure
For length, weight, volume, area, and speed, multiply your value by the factor shown in this table to get the metric or imperial equivalent, or use the full converter for that category for a value not listed. Temperature doesn't work this way: it's not a simple multiplication, since Celsius and Fahrenheit don't share a zero point. Use the two temperature rows as fixed reference points, or the temperature converter for any other value.
Notes
These are conversion factors for one imperial/US unit, not fixed reference amounts. To convert a specific measurement, multiply your value by the factor shown, or use the full converter for the matching category (length, weight, volume, area, or speed) for exact results at any value. The two temperature rows are fixed reference points, not multiplication factors.
Frequently Asked Questions
The US customary system and the British imperial system diverged after US independence, so a US gallon (3.785 L) and a UK imperial gallon (4.546 L) are different sizes despite sharing a name. This chart uses US customary units, the more common reference point for American recipes, packaging, and tools.
Multiply 15 by the 1-pound factor: 15 x 0.453592 kg = 6.80 kg. For larger batches of conversions or to avoid manual math, use the Weight converter instead.
No. A metric tonne is 1,000 kg (about 2,205 lb), while a US short ton is 2,000 lb (about 907 kg) and a UK long ton is 2,240 lb (about 1,016 kg). All three often get called a "ton" without qualification, so check which one a source means for large freight or industrial weights.
60 mph is about 96.6 km/h. Multiply any mph value by 1.60934 to get km/h, or use the Speed converter for the reverse direction or other speed units.
Length, weight, and the other categories in this table start from zero in both systems, so one multiplication factor works for every value. Temperature scales don't share a zero point: 0°F isn't the same physical temperature as 0°C. Converting requires both a multiplication and an offset (°C = (°F - 32) x 5/9), which is why this table shows two fixed reference points instead of a single factor.
Source: NIST SP 811, Table B.8 · see our methodology