How it works
Pick a category (length, weight or temperature) and the two units. Length and weight convert through exact international definitions; temperature converts through Celsius.
1 mi = 1,609.344 m · 1 lb = 0.45359237 kg · °F = °C × 9/5 + 32
Supported units
- Length: m, km, cm, mm, miles, yards, feet, inches
- Weight: kg, g, tons, pounds, ounces
- Temperature: °C, °F, K
Tips
- Displayed values are rounded; the math underneath uses exact definitions.
- For body weight and height, the BMI calculator interprets the numbers for you.
Standards and sources
- International yard and pound agreement: 1 ft = 0.3048 m, 1 lb = 0.45359237 kg exactly
- Temperature scales per the International System of Units (SI)
Last reviewed October 7, 2026
Frequently asked questions
How many meters is a mile?
Exactly 1,609.344 m by international definition (1 ft = 0.3048 m).
How many pounds is 1 kg?
About 2.20462 lb (1 lb = 0.45359237 kg exactly).
How do °F and °C convert?
°C = (°F − 32) × 5/9. So 100 °F is about 37.78 °C, and 0 °C is 273.15 K.
Are the conversions exact?
Length and weight use exact international definitions; displayed values are rounded for readability.