Stone to Lbs Converter

Quick Answer

Last updated: 11 November 2026 ·How we calculate this: 14 pounds per stone (NIST Handbook 44)

How This Stone to Lbs Converter Works

In the UK and Ireland, people usually give their body weight in stones and pounds, while the US uses pounds and most of the world uses kilograms. Choose the direction, enter the weight and press Calculate. The converter gives pounds, kilograms, stones and pounds, and decimal stones.

How to Use the Stone to Lbs Converter

1. Choose stones and pounds to lbs and kg, pounds to stones, or kilograms to stones.
2. Enter the weight.
3. Press Calculate.
4. Read pounds, kilograms, stones and pounds, and decimal stones.

Stone to Pounds Formulas

• Definition: 1 stone (st) = 14 pounds (lb)
• Pounds: lb = st × 14 + extra lb
• Stones and pounds: st = floor(lb ÷ 14); lb left = lb − 14 × st
• Kilograms: kg = lb × 0.45359237; 1 st = 6.35029 kg
• From kilograms: lb = kg ÷ 0.45359237, then split into stones

Key Terms

• Stone (st): 14 pounds, used for body weight in the UK and Ireland.
• Pound (lb): 0.45359237 kg exactly.
• Kilogram (kg): the SI unit of mass.
• Decimal stones: stones written with a decimal, such as 11.5 st.
• Avoirdupois: the everyday system of weights that includes the pound and stone.

Worked Example

A doctor’s scale in Ireland reads 13 st 9 lb. What is that in pounds and kilograms?

• 13 × 14 = 182, plus 9 = 191 lb
• 191 × 0.45359 = 86.6 kg
• In decimal stones: 191 ÷ 14 = 13.64 st

Going the other way, a weight of 85 kg is 85 ÷ 0.45359 = 187.4 lb, which is 13 st 5.4 lb.

Real-Life Examples

• Body weight: 10 st is 140 lb or 63.5 kg.
• Weight loss: losing 1 stone is losing 14 lb or 6.35 kg.
• Boxing and racing: UK weights are often given in stones.
• Medical forms: convert stones to kg for BMI.

Stone vs Pound vs Kilogram

• Stone: 14 lb, 6.35 kg.
• Pound: 0.4536 kg.
• Kilogram: 2.205 lb, about 0.157 stone.

Stone to Pounds Chart

1 st = 14 lb = 6.35 kg.

Where the Stone Comes From

The stone is an old British unit that once varied by trade and town; a stone of wool, meat or glass could each be a different weight. It was standardized at 14 pounds in the 19th century and survives mainly for body weight in the UK and Ireland. Other weights there are now metric, so food labels and luggage limits use kilograms, while bathroom scales often offer stones, pounds and kilograms.

Because a stone is 14 pounds, not 10, decimal stones can be confusing: 11.5 st is 11 st 7 lb, not 11 st 5 lb. Health calculators such as BMI usually need kilograms or pounds, so convert first. Small changes are easier to track in pounds or kilograms, since one stone is a fairly large step of 6.35 kg. If you weigh yourself on scales set to different units, weigh at the same time of day and convert to one unit before comparing results.

Common Mistakes to Avoid

• Reading 11.5 st as 11 st 5 lb. It is 11 st 7 lb.
• Using 10 pounds per stone. A stone is 14 lb.
• Forgetting the extra pounds. 11 st 4 lb is 158 lb, not 154.
• Mixing kg and stones. 1 st is 6.35 kg, not 6.
• Using stones in BMI formulas. Convert to kg or lb first.

Frequently Asked Questions

References & Sources