How many pounds are in a stone?

There are exactly 14 pounds in one stone. So 10 stone = 140 lbs, 12 stone = 168 lbs, and 15 stone = 210 lbs. The stone has been used in the British Isles since at least the 14th century for weighing goods and people.

Is stone used outside the UK?

Stone is primarily used in the United Kingdom and Ireland. It is occasionally understood in Australia and some Commonwealth countries, but most of the world uses kilograms or pounds exclusively. Even within the UK, official contexts use kilograms, making stone mainly an informal and conversational unit.

How do I quickly convert stone to pounds in my head?

Multiply the stone by 14 and add any extra pounds. A shortcut is to multiply by 15 and then subtract the stone value. For example, 9 stone: 9 x 15 = 135, minus 9 = 126 lbs. Check: 9 x 14 = 126. The shortcut works because 14 = 15 - 1.

Stone to Pounds Converter

Convert stone to pounds and pounds to stone

Published by UltraCalculatorsLast reviewed: 1 Apr 2026v1.0Report an issue

Stone and pounds are both imperial weight units that remain deeply embedded in British culture. While the stone is almost exclusively a UK and Irish measurement, the pound is used worldwide, particularly in the United States. Converting between the two is straightforward since one stone is defined as exactly 14 pounds, but having a quick converter is useful when dealing with multiple weights or when you also need the kilogram equivalent. The stone has a long history in the British Isles, originally varying by region and commodity. The standardisation to 14 pounds was formalised in 1835 under the Weights and Measures Act. Today, most British people use stone and pounds together to describe body weight (saying "eleven stone seven" rather than "161 pounds"), making this pairing a distinctly British convention. This converter works in both directions. Enter stone (with optional extra pounds) to see the total in pounds, or enter a total number of pounds to see the stone-and-pounds breakdown. The kilogram equivalent is also shown for international contexts.

How to Use This Calculator

To use the stone to pounds converter: 1. Select the conversion direction. Choose "Stone to Pounds" to convert from stone, or "Pounds to Stone" if you have a total pound figure. 2. For stone to pounds: Enter the number of stone and any additional pounds. For example, for 11 stone 7, enter 11 stone and 7 extra pounds. The converter shows the total pounds and kilograms. 3. For pounds to stone: Enter the total number of pounds. The converter breaks it into whole stone and remaining pounds. 4. Results are immediate and include a kilogram conversion for reference.

How It Works

The conversion is simple: 1 stone = 14 pounds exactly. Stone to Pounds: Total pounds = (stone x 14) + extra pounds Kilograms = total pounds x 0.453592 Example: 13 stone 5 lbs = (13 x 14) + 5 = 182 + 5 = 187 lbs = 84.82 kg Pounds to Stone: Whole stone = floor(total pounds / 14) Remaining pounds = total pounds mod 14 Example: 200 lbs = 200 / 14 = 14 stone with 4 remaining = 14 stone 4 lbs = 90.72 kg These are exact conversions within the imperial system. The kilogram figure uses the internationally defined factor of 1 lb = 0.453592 kg.

Worked Examples

Example 1: Telling an American friend your weight

Inputs: Stone: 11. Extra Pounds: 7. Direction: stone to pounds.

Total pounds = (11 x 14) + 7 = 154 + 7 = 161 lbs.
Kilograms = 161 x 0.453592 = 73.03 kg.

Result: 11 stone 7 equals 161 pounds or 73 kg.

Example 2: Converting a US boxing weight class

Inputs: Total Pounds: 175. Direction: pounds to stone.

Stone = 175 / 14 = 12 with remainder 7.
So 175 lbs = 12 stone 7 lbs.
Kilograms = 175 x 0.453592 = 79.38 kg.

Result: The light heavyweight limit (175 lbs) is 12 stone 7 or 79.4 kg.

Example 3: Calculating weight loss in different units

Inputs: Stone: 2. Extra Pounds: 0. Direction: stone to pounds.

Total pounds = 2 x 14 = 28 lbs.
Kilograms = 28 x 0.453592 = 12.70 kg.

Result: Losing 2 stone equals losing 28 pounds or 12.7 kg.

Quick stone-to-pounds table: 7 st = 98 lbs, 8 st = 112 lbs, 9 st = 126 lbs, 10 st = 140 lbs, 11 st = 154 lbs, 12 st = 168 lbs, 13 st = 182 lbs, 14 st = 196 lbs, 15 st = 210 lbs, 16 st = 224 lbs, 17 st = 238 lbs, 18 st = 252 lbs, 20 st = 280 lbs. Boxing weight classes in the UK are often discussed in stone: flyweight is about 8 stone (112 lbs), welterweight is about 10 stone 7 (147 lbs), and heavyweight starts at about 14 stone 4 (200 lbs).