LBS to KG
This free lbs to kg converter takes the pounds printed on American scales, workout programs, pet food bags and shipping labels and expresses them in the kilograms used by the metric world — medical charts, lifting standards, airline rules and science class among them.
How to use
- Type a weight in pounds into the Value box.
- The equivalent weight in kilograms appears instantly as you type.
- Swap the From and To selects to convert kilograms back to pounds.
- Copy the full equation shown under the result into your form or log.
Frequently asked questions
How many kg is 1 pound exactly?
Exactly 0.45359237 kg. Since the 1959 international yard and pound agreement the pound has been defined as 453.59237 grams, so multiplying pounds by 0.45359237 is an exact conversion, not an approximation.
What is the formula for lbs to kg?
kg = lbs × 0.45359237. For example, 10 lb × 0.45359237 = 4.5359237 kg. The reverse direction divides by 0.45359237 (equivalently multiplies by 2.204622622).
What is 150 lb in kg?
150 lb × 0.45359237 = 68.0388555 kg — a common body weight worth remembering as "about 68 kg". Doubling the shortcut: lbs × 0.45 lands within 1% for quick mental math.
Do you store the weights I convert?
No. The conversion runs entirely in your browser and nothing is uploaded, stored or logged. Close the page and nothing remains.
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About this tool
This free lbs to kg converter takes the pounds printed on American scales, workout programs, pet food bags and shipping labels and expresses them in the kilograms used by the metric world — medical charts, lifting standards, airline rules and science class among them. The math rests on the exact definition agreed in 1959: 1 lb = 453.59237 g = 0.45359237 kg, with no rounding at all, so the conversion is pounds × 0.45359237 and the result is as exact as the definition itself. Results appear on every keystroke and the full equation is printed underneath, ready for a medical form, a training log or a customs declaration. Useful anchors in this direction: 100 lb = 45.359237 kg, 150 lb = 68.0388555 kg, 200 lb = 90.718474 kg, and the gym classic — a 45 lb plate — is 20.41165665 kg. Because the metric system treats kilograms as the base unit, this direction is the one clinicians and coaches usually need: body weight in pounds becomes the kg figure that BMI charts, medication dosing (mg per kg) and weight-class limits actually require. As everywhere on this site, the calculation runs entirely in your browser: nothing you type is uploaded, stored or logged, which matters for health information. To convert kilograms back to pounds, swap the From and To selects in one click.