Stone to pounds converter

How to convert stone to lbs

Multiply the stone figure by 14, because one stone is exactly 14 pounds. So 11 st = 154 lb, 9 st = 126 lb and 15 st = 210 lb. For a weight written in stone and pounds, multiply the stones by 14 and add the pounds: 11 st 5 lb = 159 lb.

Stone and pounds to total pounds

Body weight in the UK and Ireland is often written as stones plus pounds, such as 11 st 5 lb. Convert the stones and add the extra pounds:

• 11 st 5 lb: 11 × 14 = 154, plus 5 = 159 lb.
• 10 st 8 lb: 10 × 14 = 140, plus 8 = 148 lb.
• 10 st 14 lb: the 14 lb make a full stone, so this is 11 st, or 154 lb.

To convert a mixed reading in one go, type it as stones plus a fraction of a stone: 11+5/14 gives 159 lb.

Decimal stone is not stone and pounds

A decimal counts tenths of a stone, not pounds. 11.5 st = 161 lb, which is 11 st 7 lb, because half a stone is 7 lb. Reading 11.5 st as 11 st 5 lb puts you 2 lb out.

The common fractions: a quarter stone is 3.5 lb, a half is 7 lb and three quarters is 10.5 lb. So 11.25 st is 157.5 lb, or 11 st 3.5 lb.

Stone to pounds chart

Every value is exact, since multiplying by 14 never needs rounding. A decimal pound result such as 157.5 lb is 157 lb 8 oz, because a pound has 16 ounces.

Why a stone is 14 pounds

The Gibraltar Weights and Measures Act tables define the stone as 14 avoirdupois pounds. With the pound fixed at 0.45359237 kg, one stone is 6.35029318 kg, so 11 st is 69.85 kg.

Some historical trade records used stones of other sizes for particular goods. The 14 lb stone is the one used for body weight, so check the definition before converting an old commodity record.

Quick checks

• The answer should be 14 times bigger. 11 st near 150 lb looks right; 110 lb means you multiplied by 10.
• An answer under 1 lb means you divided. 11 ÷ 14 is 0.79, the stone value of 11 lb, not the pound value of 11 st.

To split a pound total back into stone, use the pounds to stone converter. For kilograms, use stone to kg or the weight converter, and for ounces, pounds to ounces.