Metric to Imperial Converter

1. Choose the measurement: length, mass and weight, volume, area, temperature or speed. The unit lists update to match.
2. Pick the From unit you have and the To unit you want. For recipes and fuel, pick US or UK (imperial) volume on purpose.
3. Type the value. The converted amount, the exact factor and an everyday form appear at once. Swap the two units to convert imperial back to metric.

Here is what each result means:

Metric to imperial conversion expresses a metric measurement, such as meters, kilograms or liters, in the older inch-pound units. The metric system is the International System of Units (SI). It scales by powers of 10, so 1 km is 1,000 m.

Two inch-pound systems exist, and they are not identical. The imperial system is the UK system set out in the Weights and Measures Act 1985. US customary units are the US system described in NIST Handbook 44. Length and weight match in both: the yard is 0.9144 m and the pound is 0.45359237 kg. Liquid volume does not match. The UK gallon is 4.54609 L, while the US gallon is 3.785411784 L.

This page serves everyday metric to imperial work: travel distances, body weight and height, recipe volumes and oven settings. For a general metric prefix tool, see the sibling metric converter in the related tools below.

It turns your value into an SI base unit, then into the target unit, using factors that are exact by law.

1. Look up each unit in base units. One mile is 1,609.344 m and one foot is 0.3048 m, both exact.
2. Divide the two to get the factor. For km to miles that is 1,000 / 1,609.344 = 0.6213711922.
3. Multiply your value by the factor. Temperature scales have different zero points, so the tool uses the NIST formulas instead.

Height. A person is 180 cm tall. 180 / 2.54 = 70.866 in. That is 5 ft plus 10.866 in, so the everyday form is 5 ft 10.9 in.

Body weight. 70 kg x 2.2046226218 = 154.32 lb. In the UK the same weight reads as 11 st 0.3 lb, because a stone is 14 lb.

Recipe volume. 2 L of stock is 2 / 0.0295735295625 = 67.63 US fl oz. The same 2 L is 70.39 UK fl oz, because the UK fluid ounce is smaller.

Oven setting. 180 C x 1.8 + 32 = 356 F. Many US recipes round this to 350 F.

Common distances follow the same factor. A 5 km run is 3.107 mi, a 10 km race is 6.214 mi, and a 100 km/h speed limit is 62.14 mph. For the reverse direction of speed signs, see mph to km/h explained.

The factors themselves are fixed by law, so the answer only changes with the unit you pick and the rounding you apply.

US or UK Volume Units

A UK gallon, quart or pint is 1.2009 times the US one. NIST Handbook 44 describes the imperial gallon as about 20 percent larger. Picking the wrong one puts a recipe or a fuel figure off by a fifth.

The Fluid Ounce Reversal

The UK pint holds 20 fluid ounces, but the US pint holds 16. Each UK fluid ounce is 28.4130625 mL and each US fluid ounce is 29.5735295625 mL. So the US fluid ounce is 4.1 percent larger, even though the US pint is smaller.

Rounding

The tool keeps full precision and shows 7 figures. Round to match your measuring tool. Round to what your measuring jug or scale can actually show; 67.63 US fl oz is 68 in practice.

Survey Units on Old Maps

NIST retired the US survey foot on January 1, 2023. Old land records may still use it, and acres based on it differ by about 4 parts per million. This tool uses the international foot and acre.

Length, area and weight units share one definition on both sides of the Atlantic. Liquid volume is the main split.

For a deeper look at fuel and drink sizes, read liters to gallons explained.

Cooking from Another Country

A European recipe lists grams, milliliters and Celsius. Convert them to US cups, ounces and Fahrenheit, and check whether a British recipe means UK pints. The cooking measurement conversions guide covers flour and sugar by weight.

Travel and Driving

Road signs in km/h, fuel in liters and weather in Celsius all need quick translation in the US. Choose Speed, Volume or Temperature and keep the preset handy.

Height, Weight and Fitness

Forms in the US ask for feet and inches and pounds, while UK forms often use stone. The everyday form gives 5 ft 10.9 in or 11 st 0.3 lb directly. For single-pair jobs, the cm to inches converter is a faster one-field tool.

These values come from the same exact factors the tool uses, rounded for reading.

1. Mixing US and UK Pints or Gallons

A UK pint is 568 mL and a US pint is 473 mL. Using the wrong one changes the amount by about 20 percent.

2. Treating a Fluid Ounce as a Weight Ounce

A fluid ounce measures volume. An avoirdupois ounce, 28.349523125 g, measures mass. They only match roughly for water-like liquids.

3. Multiplying Celsius by a Factor

Doubling 20 C does not give a real Fahrenheit value. You must also add 32 after scaling by 1.8, because the scales start at different points.

4. Rounding the Factor Too Early

Using 1.6 for the mile gives 6.25 mi for 10 km, not 6.214. Keep the full factor and round only the final answer.

5. Converting a Temperature Change with the Formula

A rise of 10 C is a rise of 18 F, not 50 F. Temperature intervals use only the 1.8 scale, without the 32 offset.

6. Assuming a US Cup Is 250 ML

A US cup is 8 US fl oz, or 236.59 mL. A 250 mL metric cup is about 5.7 percent larger.

The conversions are as exact as the definitions allow, because each factor is fixed by NIST or UK law.

No. The US uses US customary units, which share the inch, foot, mile and pound with the UK imperial system. Their gallons, quarts, pints and fluid ounces differ.

One kilogram is 2.2046226218 pounds. That follows from the exact definition 1 lb = 0.45359237 kg, so 1 / 0.45359237 gives the factor.

The United States, UK and other nations agreed in 1959 to define the inch as 25.4 mm. Since then the inch, foot, yard and mile are exact metric multiples.

Double the Celsius figure and add 30. It is close for weather: 20 C gives 70 F against a true 68 F. At oven heat it drifts: 180 C gives 390 F against a true 356 F.

One liter is 4.227 US cups, using the US cup of 8 US fluid ounces, or 236.5882365 mL. A 250 mL metric cup gives exactly 4.

Yes. A UK pint is 568.26125 mL and a US pint is 473.176473 mL. The UK pint is 1.2009 times larger, about 20 percent.

Divide the centimeters by 2.54 to get inches, then divide by 12 for feet. The remainder is inches. The tool shows this directly as the everyday form, for example 5 ft 10.9 in for 180 cm.

Seventy kilograms is 11.02 stone, or 11 st 0.3 lb. One stone is 14 pounds, which is 6.35029318 kg under UK law.

Yes. Pick the imperial unit as the From unit and the metric unit as the To unit. The same exact factors run in reverse, and the Reverse factor result always shows the other direction.

Most gaps come from rounded factors, such as 1.6 for the mile, or from US vs UK volume. A few tools still use the US survey foot for acres, a 4 parts per million difference.

No. The conversion runs in your browser, and nothing is sent to our servers. Anything you choose to Save stays in this browser only.

• General tables of units of measurement, including US and British volume notes (NIST Handbook 44, 2026, Appendix C).
• Exact conversion factors for units listed alphabetically (NIST SP 811, Appendix B.8).
• Temperature conversion formulas (NIST SP 811, Appendix B.9).
• Imperial units defined in UK law: yard, pound, gallon, pint (Weights and Measures Act 1985, Schedule 1, legislation.gov.uk).
• The US survey foot and its retirement in 2023 (NIST Office of Weights and Measures).