Pound to Stone Converter
Weight · unit-converter
Convert Pound to Stone 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: Pound (lb)
To: Stone (st)
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.
About Stone
The stone is 14 pounds (UK and Ireland). It is often used for human body weight in those regions.
How to convert pounds to stone
1 pound is equal to 0.07142857142857 stone:
1 lb = (453.59237 g ÷ 6350.29318 g) st = 0.07142857142857 st
Each pound is defined as 453.59237 g and each stone as 6350.29318 g, so one lb equals 453.59237 ÷ 6350.29318 st = 0.07142857142857 st.
Let w(lb) be the numeric value of the same mass measured in Pound (lb), and w(st) the value in Stone (st). Then:
w(st) = w(lb) × (453.59237 / 6350.29318)
Equivalently, divide by how many lb fit into one st (grams per st divided by grams per lb):
w(st) = w(lb) ÷ 14
Or: stone = pound ÷ 14
Examples
Example #1: Convert 20 lb to stone
20 lb = 20 lb × (453.59237/6350.29318) st = 1.4285714286 st
20 lb = 20 lb ÷ 14 = 1.4285714286 st
Example #2: Convert 50 lb to stone
50 lb = 50 lb × (453.59237/6350.29318) st = 3.5714285714 st
50 lb = 50 lb ÷ 14 = 3.5714285714 st
Summary
To convert Pound to Stone, multiply the value in lb by the ratio of grams per lb divided by grams per st. Equivalently: value_st = value_lb × (453.59237 / 6350.29318). Numerically, 1 lb equals 0.07142857142857144 st.
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
| Pound (lb) | Stone (st) |
|---|---|
| 0.1 | 0.0071428571 |
| 1 | 0.0714285714 |
| 2 | 0.1428571429 |
| 3 | 0.2142857143 |
| 4 | 0.2857142857 |
| 5 | 0.3571428571 |
| 6 | 0.4285714286 |
| 7 | 0.5 |
| 8 | 0.5714285714 |
| 9 | 0.6428571429 |
| Pound (lb) | Stone (st) |
|---|---|
| 10 | 0.7142857143 |
| 20 | 1.4285714286 |
| 30 | 2.1428571429 |
| 40 | 2.8571428571 |
| 50 | 3.5714285714 |
| 60 | 4.2857142857 |
| 70 | 5 |
| 80 | 5.7142857143 |
| 90 | 6.4285714286 |
| 100 | 7.1428571429 |