How to Convert Units (Length, Weight, Temperature)
From following a recipe to reading a foreign weather report, unit conversion is a daily need. The metric and imperial systems don't line up neatly, so it helps to know the key conversions — and to have a tool that does them instantly.
Length conversions
- 1 inch = 2.54 cm
- 1 foot = 0.3048 m
- 1 mile = 1.609 km
- 1 meter = 3.281 feet
Weight conversions
- 1 kilogram = 2.205 pounds
- 1 pound = 0.4536 kg
- 1 ounce = 28.35 grams
Temperature conversions
Temperature isn't a simple multiplication — it uses formulas:
°F = (°C × 9 ÷ 5) + 32
°C = (°F − 32) × 5 ÷ 9
Example: 100°C = (100 × 9 ÷ 5) + 32 = 212°F.
Step-by-step: convert units
- Open the Unit Converter.
- Choose a category: length, weight or temperature.
- Pick the "from" and "to" units and type your value.
- The result updates instantly.
💡 Tip: A quick mental trick — to convert Celsius to Fahrenheit roughly, double it and add 30. 20°C ≈ 70°F (exact is 68°F).
Frequently Asked Questions
Why doesn't temperature use a simple factor?
Because the Celsius and Fahrenheit scales start at different zero points, so conversion needs both a multiply and an add step.
How many cm in an inch?
Exactly 2.54 cm.
How do I convert kg to pounds fast?
Multiply kilograms by roughly 2.2. So 10 kg ≈ 22 lb.
Does the converter round the result?
It shows a sensible number of decimal places for everyday use while keeping good accuracy.
Is it free?
Yes, completely free and it works in your browser.
Try the Unit Converter