Unit Conversion Cheat Sheet
Quick reference for common unit conversions in length, weight, volume, temperature, and more.
About this reference
A quick-reference sheet of common conversions for length, weight, volume, temperature, area and speed. Search for what you need.
Bookmark it for homework, travel and cooking.
How to use it
- Search the unit you need.
- Read the equivalents.
- Use the converters for exact calculations.
Key conversions
Length: 1 km = 0.6214 mi; 1 m = 3.2808 ft; 1 in = 2.54 cm. Weight: 1 kg = 2.2046 lb; 1 lb = 453.59 g. Volume: 1 L = 0.2642 US gal; 1 US gal = 3.785 L. Temperature: °F = °C × 1.8 + 32. Area: 1 acre = 4,046.86 m²; 1 hectare = 10,000 m². Speed: 1 m/s = 3.6 km/h; 1 mph = 1.609 km/h.
Worked example
Quick maths
| 5 km | 3.1 miles |
| 70 kg | 154.3 lb |
| 180 cm | 5 ft 10.9 in |
| 37°C | 98.6°F |
Tips and common mistakes
- Multiply miles by 1.609 for km.
- Doubling kg and adding 10% gives lb.
- °C to °F: double and add 30 for a quick estimate.
- Always check the unit before calculating.
- Use the full converters for precision.
Frequently asked questions
How many cm in an inch?
2.54.
How many pounds in a kg?
2.2046.
What is 37°C in °F?
98.6°F.
How many metres in a mile?
1,609.344.
What is a hectare?
10,000 square metres.
Is it free?
Yes.