Stone to Pound Converter
Weight · unit-converter
Convert Stone to Pound with a fixed input and output unit, step-by-step formula line, and reference tables. All calculations use gram-based factors (international avoirdupois pound and metric definitions). The full Weight Converter also includes carat, grain, and US/UK hundredweight.
Calculator
From: Stone (st)
To: Pound (lb)
About Stone
The stone is 14 pounds (UK and Ireland). It is often used for human body weight in those regions.
About Pound
The international avoirdupois pound is exactly 0.45359237 kg. It is the standard pound for weight in the US and for many trade weights.
How to convert stone to pounds
1 stone is equal to 14 pound:
1 st = (6350.29318 g ÷ 453.59237 g) lb = 14 lb
1 stone = 14 pounds exactly (UK/Ireland usage).
Each stone is defined as 6350.29318 g and each pound as 453.59237 g, so one st equals 6350.29318 ÷ 453.59237 lb = 14 lb.
Let w(st) be the numeric value of the same mass measured in Stone (st), and w(lb) the value in Pound (lb). Then:
w(lb) = w(st) × (6350.29318 / 453.59237)
Equivalently, divide by how many st fit into one lb (grams per lb divided by grams per st):
w(lb) = w(st) ÷ 0.07142857142857
Or: pound = stone ÷ 0.07142857142857
Examples
Example #1: Convert 20 st to pound
20 st = 20 st × (6350.29318/453.59237) lb = 280 lb
20 st = 20 st ÷ 0.07142857142857 = 280 lb
Example #2: Convert 50 st to pound
50 st = 50 st × (6350.29318/453.59237) lb = 700 lb
50 st = 50 st ÷ 0.07142857142857 = 700 lb
Summary
To convert Stone to Pound, multiply the value in st by the ratio of grams per st divided by grams per lb. Equivalently: value_lb = value_st × (6350.29318 / 453.59237). Numerically, 1 st equals 13.999999999999998 lb.
Relationship context
Both units belong to imperial / UK (stone, long ton, pound, ounce). Relationships such as 16 oz per lb and 14 lb per stone are exact in the avoirdupois system; tons use fixed pound counts. This tool uses international definitions tied to the kilogram.
Conversion tables
| Stone (st) | Pound (lb) |
|---|---|
| 0.1 | 1.4 |
| 1 | 14 |
| 2 | 28 |
| 3 | 42 |
| 4 | 56 |
| 5 | 70 |
| 6 | 84 |
| 7 | 98 |
| 8 | 112 |
| 9 | 126 |
| Stone (st) | Pound (lb) |
|---|---|
| 10 | 140 |
| 20 | 280 |
| 30 | 420 |
| 40 | 560 |
| 50 | 700 |
| 60 | 840 |
| 70 | 980 |
| 80 | 1,120 |
| 90 | 1,260 |
| 100 | 1,400 |