Weight converter
Convert any mass via the SI kilogram. Factors are exact international definitions — see the arithmetic for your input, plus a table of every equivalent.
Defaults to your region. Switch to compare any other scale.
Canonical unit is the kilogram. Pound is exact 0.45359237 kg (NIST).
Result
154.323584 lb
kg → lb
70 kg × 1 = 70 kg; 70 ÷ 0.45359237 = 154.323584 lb
- In SI kilograms70 kg
- Factor (from)1 kg = 1 kg
- Factor (to)1 lb = 0.45359237 kg
- How calculated70 kg × 1 = 70 kg; 70 ÷ 0.45359237 = 154.323584 lb
- Cross rate1 kg = 2.204623 lb
Via the kilogram (SI)
Standards: BIPM SI + avoirdupois pound (exact 0.45359237 kg). 70 kg × 1 = 70 kg; 70 ÷ 0.45359237 = 154.323584 lb
All equivalents
| Unit | Symbol | Value | Factor to kilogram |
|---|---|---|---|
| mg (milligram) | mg | 70,000,000 | 1 mg = 0.000001 kg |
| g (gram) | g | 70,000 | 1 g = 0.001 kg |
| kg (kilogram) | kg | 70 | 1 kg = 1 kg |
| t (tonne) | t | 0.07 | 1 t = 1000 kg |
| oz (ounce) | oz | 2,469.1773 | 1 oz = 0.028349523125 kg |
| lb (pound) | lb | 154.323584 | 1 lb = 0.45359237 kg |
| st (stone) | st | 11.023113 | 1 st = 6.35029318 kg |
| US ton (short ton) | US ton | 0.07716179 | 1 US ton = 907.18474 kg |
| µg (microgram) | µg | 70,000,000,000 | 1 µg = 0.000000001 kg |
About this tool
Mass conversion is a two-step scale change through the kilogram. Multiply the input by its factor to kilograms, then divide by the target factor: value_kg = value × factor_from; result = value_kg ÷ factor_to.
The international avoirdupois pound is defined as exactly 0.45359237 kg, so 1 ounce = 0.028349523125 kg and 1 stone = 14 lb = 6.35029318 kg. Metric prefixes (µg, mg, g, t) are exact powers of ten of the kilogram. The US short ton is 2000 lb = 907.18474 kg.
Use the all-units table for kitchen scales, shipping, gym plates, or school homework. Pair with BMI when body weight is in kg vs lb, or the length converter for height.
Formula
value_kg = value × factor_fromresult = value_kg ÷ factor_to1 lb = 0.45359237 kg (exact)1 oz = 0.028349523125 kg · 1 st = 6.35029318 kg1 g = 0.001 kg · 1 mg = 0.000001 kg · 1 t = 1000 kg
How it is calculated
- Enter a mass and pick From / To units.
- Convert to kilograms: value_kg = value × factor_from (e.g. 1 lb = 0.45359237 kg).
- Convert to the target: result = value_kg ÷ factor_to.
- Read the step rows for the exact arithmetic of this input.
- Open the equivalents table to see mg, g, kg, oz, lb, st and more at once.
Questions
How does weight conversion work?
All masses go through the kilogram: multiply by the source factor to get kilograms, then divide by the target factor. Example: 70 kg → 70 × 1 = 70 kg → 70 ÷ 0.45359237 ≈ 154.32 lb.
Is the pound exactly 0.45359237 kg?
Yes. The international avoirdupois pound is defined as exactly 0.45359237 kilograms (NIST / BIPM). That makes 1 oz = 1/16 lb and 1 stone = 14 lb exact as well.
What about the US ton vs the tonne?
The metric tonne (t) is exactly 1000 kg. The US short ton is 2000 lb ≈ 907.185 kg. They are not interchangeable.
Are the results official metrology advice?
No. Calculate This is educational. For legal metrology, use your national institute’s guidance and calibrated instruments.