Enter pounds to see the same weight in decimal stone and as whole stones with pounds left over.
Table of contents
How to use our Pounds to Stone Converter
- Enter the total weight in "Weight in pounds (lb)." Decimals such as 165.5 are allowed, and you may add lb or lbs after the number.
- Open "Advanced options" if you need a different number of digits after the decimal-stone result.
- Select "Calculate" to see decimal stone first, then the same weight as whole stones and pounds remaining.
- Sanity-check the mixed reading: the pounds after "st" should be from 0 up to, but not including, 14 unless display rounding carries it into the next stone.
Definitions
Pound (lb): The starting weight unit entered into this converter.
Stone (st): A weight unit equal to exactly 14 pounds. [1]
Decimal stone: Weight written as a number of stones with a decimal part. For example, 9.5 st is nine and one-half stone, not 9 st 5 lb.
Stones and pounds: A mixed-unit reading that gives whole stones followed by the pounds left over, such as 9 st 2 lb.
Common mistakes and quick fixes
Mistake: Reading 9.14 st as 9 st 14 lb.
Fix: The.14 is part of one stone, not pounds. Use the "Weight in stones and pounds" result for the traditional reading.
Mistake: Entering a mixed value such as 11 st 6 lb.
Fix: Enter one total in pounds. For this example, use 160 lb because 11 x 14 + 6 = 160.
Mistake: Typing a comma incorrectly, such as 1,40.
Fix: Use commas only for thousands grouping, such as 1,400, or enter 1400 without a comma.
Mistake: Finding pounds remaining from a rounded decimal-stone answer.
Fix: Use the mixed-unit result. It is calculated from the original pounds value before display rounding.
Mistake: Entering a negative physical weight.
Fix: Enter 0 or a positive number. Zero is valid and converts to 0 st 0 lb.
Limitations & Key Assumptions / Boundary Conditions
- This converter changes weight units only. It does not assess health, body size, shipping limits, or fitness goals.
- Enter one total in pounds, not a stones-and-pounds expression such as 11 st 6 lb.
- The decimal-stone result can be rounded for display, while the pounds remainder is calculated from the original entered value.
- A very small nonzero weight can display as 0 st at a low decimal setting. Increase "Result decimal places" to show more detail.
- The conversion cannot be more accurate than the value from the scale, record, or other source.
Methodology
How the conversion works
One stone equals 14 pounds. The calculator divides the entered pounds by 14 to find decimal stone. [1]
stone = pounds / 14
It then keeps the whole-stone part and finds the pounds left over from the original pounds value.
whole stones = floor(stone)
remaining pounds = pounds - (whole stones x 14)
Worked example
For 128 lb, 128 / 14 = 9.142857... st. The whole-stone part is 9. Then 128 - (9 x 14) = 2, so the mixed reading is 9 st 2 lb.
Rounding
The calculator keeps unrounded values during the calculation. It rounds only the displayed decimal-stone result and any fractional pounds remainder. If a rounded remainder would display as 14 lb, it carries that amount into the next whole stone and displays 0 lb.