Weight Converter

Convert weight and mass between metric and imperial — mg, g, kg, ounces, pounds, stone, and metric tons. Free and instant.

Reviewed / updated August 4, 2026

Your inputs

Result

Converted weight

68.038856

Kilograms (kg)

Input
150 lb
Output
68.038856 kg

150 Pounds (lb) = 68.038856 Kilograms (kg). Exact fixed factors — no live API. Useful for weight conversions in school, DIY, and travel.

Same value in other units

  • Milligrams (mg)6.8039e+7
  • Grams (g)68,038.8555
  • Kilograms (kg)68.038856
  • Ounces (oz)2,400
  • Stone (st)10.714286

Suggested next steps

  • Need distance or liquid units? Open the Length or Volume converters.
  • Double-check whether a recipe uses US cups/gallons vs metric liters.
  • For percent math after a conversion, use the Percentage Calculator.

How the weight conversion works

  1. Enter the amount and select the From unit
  2. Select the To unit (or swap)
  3. Values convert through kilograms using exact factors
  4. Related units appear below so you can compare without changing the dropdowns

All math is client-side with static conversion constants.

Worked example

Convert 150 lb to kilograms:

  1. 150 × 0.45359237 ≈ 68.0389 kg
  2. In ounces: 150 × 16 = 2,400 oz
  3. In stone: 150 ÷ 14 ≈ 10.71 st

Handy for fitness goals, shipping forms, and recipes that mix US and metric packages.

Methodology and notes

Factors follow international avoirdupois and SI definitions. Precious-metal troy ounces are not included. Pair with the Length and Volume converters when a project needs more than one unit type.

Frequently asked questions

How do you convert pounds to kilograms?

Multiply pounds by 0.45359237 (the exact avoirdupois pound definition). This converter applies that factor automatically when you pick lb → kg.

Is stone included?

Yes. One stone = 14 pounds = 6.35029318 kg. Useful for body-weight conventions in the UK alongside pounds and kilograms.

Weight vs mass — which is this?

Everyday “weight” conversions here use mass units (kg, lb). We do not convert force units like newtons. For kitchen liquids, use the Volume Converter instead.

Can I convert tiny amounts like milligrams?

Yes — milligrams and grams are included for supplements, recipes, and lab-style quantities, alongside kg and imperial units.

Related tools

Related calculators — live tools and upcoming pages for internal linking.