kg to lb Converter

How to use this tool

Enter any weight in kilograms (kg) or pounds (lb) above to convert in either direction immediately in your browser. The tool displays decimal results and stones-and-pounds output for kg-to-lb conversions. The reference table below also explains pounds-and-ounces notation.

For grams, milligrams, metric tonnes or liquid volumes, use the full Unit Converter.

To convert height or dimensions alongside weight, use the cm to Inches Converter.

For oven and weather temperatures, use the Temperature Converter.

Transparent method: the exact international kg ↔ lb conversion factor

Under the 1959 International Yard and Pound Agreement standardized by the National Institute of Standards and Technology (NIST Guide to the SI, Appendix B), 1 avoirdupois pound (lb) is defined as exactly 0.45359237 kilograms (kg):

Fast mental math approximation (about 0.21% low for kg to lb)

To convert kilograms to pounds in your head without a calculator:

Double the kilograms (70 kg × 2 = 140).

Take 10% of that doubled number (140 ÷ 10 = 14).

Add them together: 140 + 14 = 154 lbs (the exact figure is 154.32 lbs).

To convert pounds to kilograms in your head: divide the pounds in half (150 lbs ÷ 2 = 75), then subtract 10% of that half (75 − 7.5 = 67.5 kg, close to the exact 68.04 kg).

Quick-reference conversion table: 1 kg to 100 kg in pounds (lbs) and stones (st)

Use this reference chart for gym plates, airline baggage limits (23 kg = 50.7 lbs), laptop commuting weights, and body-weight conversions:

Why 2.35 lbs is NOT "2 pounds, 35 ounces" (Decimal pounds vs. ounces)

A common kitchen and postal shipping mistake is misreading the digits after the decimal point in lbs as ounces:

Because 1 pound = 16 ounces (not 10 or 100 ounces), 0.5 lbs is 8 ounces (0.5 × 16 = 8 oz), and 0.25 lbs is 4 ounces (0.25 × 16 = 4 oz).

Similarly, in the UK and Ireland, 1 stone = 14 pounds, so 10.5 stone equals 10 stone, 7 pounds (0.5 × 14 = 7 lbs), not 10 stone, 5 pounds.

When converting dry baking ingredients (like flour or sugar) across US, UK, and Canadian recipes, remember that cups measure volume whereas kilograms/grams/ounces measure weight—see our complete guide to US cups vs. UK cups recipe measurement conversions.

How to convert kg and lbs in Excel and Google Sheets

Use the built-in spreadsheet CONVERT function (assuming your weight value is in cell A2):

Kilograms to Pounds (kg → lbs): =CONVERT(A2, "kg", "lbm") (or =A2 * 2.20462262)

Pounds to Kilograms (lbs → kg): =CONVERT(A2, "lbm", "kg") (or =A2 * 0.45359237)

Assumptions and limits

• One international avoirdupois pound equals exactly 0.45359237 kilograms.
• The kilograms-to-pounds decimal is the reciprocal of the exact pound definition and is approximate when displayed.
• The engine keeps full internal precision; the main display uses up to 12 significant digits.
• One stone equals exactly 14 international avoirdupois pounds.
• Stones-and-pounds output is derived from the converted total pounds and uses up to two decimal places for remaining pounds.
• The optional conventional result is clearly labelled as rounded to the nearest whole pound.
• Zero, decimals and negative values are supported mathematically; negative physical mass may not be meaningful in every use case.
• This converter performs unit conversion only and does not assess health, BMI or an ideal weight.

Sources

• NIST Guide to the SI, Appendix B.8: Factors for Units Listed Alphabetically
• Approximate Conversions from U.S. Customary Measures to Metric