Unit Converter and Conversion Calculator
Our conversion calculator changes length, weight and temperature values between metric and imperial units in one step. Type a number, pick the two units and the answer appears as you type. It handles everyday jobs like feet to meters, kg to lbs and Celsius to Fahrenheit without a chart.
How the Unit Conversion Calculator Works
Every length and weight result comes from one fixed factor. The tool turns your value into meters or kilograms first. It then divides by the factor of the unit you want. We use the exact international definitions, so 1 inch is 2.54 cm and 1 pound is 0.45359237 kg.
Temperature follows a different rule. Celsius, Fahrenheit and Kelvin start from different zero points. Our unit conversion calculator shifts the offset before it scales the number. That is why 0 °C shows as 32 °F.
Units You Can Convert
- Length: meters, kilometers, centimeters, millimeters, inches, feet, yards and miles
- Weight: kilograms, grams, pounds and ounces
- Temperature: Celsius, Fahrenheit and Kelvin
Each group works both ways, so feet to meters and meters to feet use one screen. Pick the type first and the unit menus refill. A length can never become a weight, so groups do not mix.
Common Conversions With Worked Examples
Length: Centimeters, Millimeters and Inches
To change cm to inches, divide by 2.54. A height of 180 cm shows as 70.866142 inches in our unit converter. For mm to inches the divisor is 25.4, so 10 mm is 0.393701 inches. Five kilometers equals 3.106856 miles.
Converting Your Height
Many forms ask for your height in cm. Turn feet and inches into total inches first. A height of 5 feet 7 inches is 67 inches, which the unit converter shows as 170.18 cm.
Weight: Kilograms, Pounds, Grams and Ounces
One kilogram equals about 2.204623 pounds. So 70 kg to lbs gives 154.323584 lb, and 150 lb gives 68.038856 kg. Cooks often need grams to ounces, where 100 g equals 3.527396 oz.
Temperature: Celsius to Fahrenheit
Multiply Celsius by 9/5 and add 32. So 25 °C is 77 °F and 37 °C is 98.6 °F. For Fahrenheit to Celsius, subtract 32 and multiply by 5/9. For Kelvin to Celsius, take away 273.15.
Quick Metric Conversion Chart
Use these values to check a result by hand. They are the same factors the tool uses. Round only at the final step.
| 1 inch | 2.54 cm |
| 1 foot | 0.3048 m |
| 1 yard | 0.9144 m |
| 1 mile | 1.609344 km |
| 1 pound | 0.45359237 kg |
| 1 ounce | 28.349523 g |
| 100 °C | 212 °F |
Tips for Accurate Results
Round only at the end of a sum, never in the middle. Check the type before you read the answer, since fluid ounces measure volume and not weight. A measurement calculator cannot fix a wrong unit choice. Metric conversion is easier because each step is a power of 10.
Why Use Our Free Converter
Our unit converter covers the length, weight and temperature jobs people search for every day. It works as a simple measurement calculator for school, cooking and travel. Everything runs in your browser, so your numbers stay on your device. Convert your next value now.
Frequently asked questions
Is this conversion calculator free?
Yes, it is free with no sign up and no limit on conversions.
What is the fastest way to convert cm to inches?
Divide the value in centimeters by 2.54.
How do I find my height in cm?
Multiply your total inches by 2.54, so 70 inches is 177.8 cm.
Can the unit converter change grams to ounces?
Yes, pick Weight and then choose grams and ounces.
Does it convert mm to inches?
Yes, and 25.4 mm makes exactly 1 inch.
What is 100 °C in Fahrenheit?
It is 212 °F, the boiling point of water at sea level.
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