Stones and Pounds to Kg Converter

How it is calculated

The tool first turns the weight into pounds, then into kilograms: total lb = stones × 14 + pounds and kg = total lb × 0.45359237. One stone is exactly 14 lb and the pound is defined as 0.45359237 kg. The pounds box is optional; left empty it counts as 0. Neither value can be negative. The pounds box is not limited to 13, so 20 lb is simply added to the total (11 st 20 lb gives 174 lb). Both the kilograms and the combined pound total are shown, rounded to two decimals.

Common mistakes

• Typing 11.4 into the stones box to mean 11 st 4 lb; 0.4 stone is 5.6 lb, not 4 lb. Use the separate pounds box.
• Multiplying stones by 6.35 and forgetting to add the extra pounds separately.
• Assuming the pounds box rolls over past 13; 11 st 20 lb is treated as 174 lb, not as 12 st 6 lb.
• Confusing the stone with the US short ton or the 100-lb hundredweight; the stone is always 14 lb.