Weight converter

Convert weight between kilograms (kg), stone (st) and pounds (lb).

Weight converter (kg ⇄ st & lb)

Handy UK conversion for weights.

How to use the Weight Converter (step-by-step)

Convert between kilograms (kg) and stone & pounds (st & lb) in seconds. Perfect for health, sport, travel and shopping.

Quick start

  1. To convert kg → st & lb
    • Type your weight in Kilograms (kg).
    • Click “kg → st & lb” (or press Enter in the kg box).
    • Read the result as stone plus pounds (e.g. 75 kg → 11 st 11.0 lb).
  2. To convert st & lb → kg
    • Enter whole Stone (st) and additional Pounds (lb) (decimals allowed).
    • Click “st & lb → kg”.
    • Read the result in kilograms (e.g. 11 st 3 lb → 71.2 kg).
  3. Use Clear to reset all fields.

Examples

  • Fitness 68 kg → 10 st 10.0 lb
  • Medical 12 st 4 lb → 77.8 kg
  • Sport 95 kg → 14 st 13.7 lb
  • Everyday 9 st 7.5 lb → 60.3 kg

Conversion facts

  • 1 kilogram (kg) = 2.2046226218 pounds (lb)
  • 1 stone (st) = 14 pounds (lb)
  • 1 pound (lb) = 0.45359237 kilograms (kg)

What the tool does behind the scenes

Formulas (for reference) 
kg → st & lb:
  total_lb = kg × 2.2046226218
  st       = floor(total_lb ÷ 14)
  lb       = total_lb − (st × 14)

st & lb → kg:
  total_lb = (st × 14) + lb
  kg       = total_lb ÷ 2.2046226218

Displayed pounds are rounded to 1 decimal by default; kilograms to 1 decimal when converting from st & lb.

Pro tips

  • Decimals are OK: You can enter fractions like 11.5 st or 2.3 lb.
  • Precision: For stricter recording (e.g., clinical use), note that the internal conversion uses the exact factors above, then rounds for display.
  • Common UK format: Results show stone and pounds (e.g., 12 st 6.5 lb).
  • Keyboard flow: Type a value → press Enter (in that field) to convert quickly.
  • Negative or zero? Enter positive values only—weight can’t be negative.

Troubleshooting

  • “Enter kilograms to convert.” — The kg box is empty or invalid. Type a number like 75 or 75.5.
  • “Enter stone and/or pounds to convert.” — Fill at least one of the st/lb fields with a positive number.
  • Unexpected decimals? — Pounds are rounded to one decimal for readability; totals use precise math under the hood.

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