How many inches are in a centimetre?

One centimetre equals 0.393701 inches. To convert centimetres to inches, multiply the centimetre value by 0.393701. Conversely, one inch equals exactly 2.54 centimetres. For example, 30 cm equals 11.81 inches.

How do I convert kilograms to pounds?

To convert kilograms to pounds, multiply the kilogram value by 2.20462. One kilogram equals 2.20462 pounds (lb). For example, 10 kg equals 22.05 lb. To convert to stones and pounds, divide the kilogram value by 6.35029 to get stones, then multiply the decimal remainder by 14 to get the remaining pounds.

How do I convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply the Celsius value by 9, divide by 5, then add 32. The formula is: F = (C x 9/5) + 32. For example, 100 degrees Celsius (boiling point of water) equals 212 degrees Fahrenheit. Normal human body temperature of 37 degrees Celsius equals 98.6 degrees Fahrenheit.

Metric to Imperial Converter

Enter a metric value and choose length, weight, volume or temperature to convert millimetres, grams, litres, or Celsius into inches, pounds, gallons, and Fahrenheit instantly, plus a quick reference table.

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Standard conversions All conversion factors are exact international standard values (NIST/SI).

Metric Input

Value to convert

From unit

Worked Example

100 centimetres equals:

39.37 inches
3.281 feet
1.094 yards

Formula: cm × 0.393701 = inches; cm / 30.48 = feet

Length Conversion Results

Imperial Unit	Result

Metric Input

Value to convert

From unit

Worked Example

1 kilogram equals:

2.205 pounds (lb)
35.274 ounces (oz)
0.157 stones (st)

Formula: kg × 2.20462 = pounds; kg × 35.2740 = ounces

Weight Conversion Results

Imperial Unit	Result

Metric Input

Value to convert

From unit

Worked Example

1 litre equals:

0.2200 imperial gallons
0.2642 US gallons
35.195 imperial fl oz
33.814 US fl oz

Formula: L × 0.219969 = imperial gallons; L × 0.264172 = US gallons

Volume Conversion Results

Imperial/US Unit	Result

Metric Input

Temperature in Celsius (°C)

Worked Example

100 degrees Celsius equals:

212 °F (boiling point of water)
373.15 K (Kelvin)

Formula: (C × 9/5) + 32 = °F; C + 273.15 = K

Temperature Conversion Results

Unit	Result

Quick Reference

Length

1 mm0.0394 in

1 cm0.3937 in

1 m3.2808 ft

1 m1.0936 yd

1 km0.6214 mi

Weight

1 g0.0353 oz

1 kg2.2046 lb

1 kg35.274 oz

1 t2204.6 lb

1 t0.9842 long ton

Volume & Temperature

1 mL0.0352 imp fl oz

1 L0.2200 imp gal

1 L1.7598 imp pt

0 °C32 °F

100 °C212 °F

How to Convert Metric to Imperial

The metric system (International System of Units, SI) and the imperial system share no common base, so each type of measurement requires its own conversion factor. The conversions used on this page are the internationally agreed exact values published by the National Institute of Standards and Technology (NIST) and the International Bureau of Weights and Measures (BIPM).

Length Conversions

The foundation of length conversion is the exact definition that 1 inch equals exactly 2.54 centimetres (since 1959). All other length conversions are derived from this:

Metric	Imperial	Factor
1 millimetre (mm)	0.039370 inches	÷ 25.4
1 centimetre (cm)	0.393701 inches	÷ 2.54
1 metre (m)	3.28084 feet	÷ 0.3048
1 metre (m)	1.09361 yards	÷ 0.9144
1 kilometre (km)	0.621371 miles	÷ 1.60934

Weight Conversions

Weight conversions are based on the international avoirdupois pound, which is defined as exactly 453.59237 grams:

Metric	Imperial	Factor
1 gram (g)	0.035274 ounces (oz)	÷ 28.3495
1 kilogram (kg)	2.20462 pounds (lb)	× 2.20462
1 kilogram (kg)	0.157473 stones (st)	÷ 6.35029
1 tonne (t)	2204.62 pounds	× 2204.62
1 tonne (t)	0.984207 long tons	÷ 1.01605

Volume Conversions

Note that imperial gallons and US gallons are different units. One imperial gallon equals approximately 4.546 litres, while one US gallon equals approximately 3.785 litres. This page shows both:

Metric	Imperial (UK)	US
1 millilitre (mL)	0.035195 fl oz	0.033814 fl oz
1 litre (L)	1.75975 pints	2.11338 pints
1 litre (L)	0.219969 gallons	0.264172 gallons
1 cubic metre (m³)	219.969 gallons	264.172 gallons

Temperature Conversion

The Celsius to Fahrenheit formula is: F = (C × 9/5) + 32. Useful reference points: water freezes at 0 °C (32 °F), water boils at 100 °C (212 °F), and a comfortable room temperature of 20 °C equals 68 °F. Kelvin is the SI base unit of temperature: K = C + 273.15.

Metric vs Imperial: Which Is Used in New Zealand?

New Zealand officially adopted the metric system in 1976 and uses SI units for all official, scientific, and commercial purposes. Speed limits and distances are in kilometres, weights in kilograms, and temperatures in Celsius. Imperial units are still encountered informally, particularly in older construction contexts (where feet and inches persist for human heights and some building materials), and in recipes influenced by American or British cookbooks. Understanding both systems is useful for anyone working with imported goods, international recipes, or older New Zealand documents.

Related Calculators

Essential Calculators Hub: all unit converters in one place.
Imperial to Metric Conversion: convert the other way.
cm to Feet and Inches Converter: detailed height conversions.
Celsius to Fahrenheit Converter: temperature conversions in detail.
Area Conversion Calculator: convert square metres, hectares, acres and more.

Sources and method: Conversion factors from NIST Special Publication 811 (2008 edition) and the International Bureau of Weights and Measures (SI Brochure, 9th edition). The 1959 international inch definition (1 in = 2.54 cm exactly) and the international avoirdupois pound (1 lb = 453.59237 g exactly) underpin all length and weight conversions shown.

This converter uses internationally standard conversion factors. Volume conversions show both UK imperial and US customary units, which differ. For trade and legal purposes, always verify with official standards bodies.