Ans

Unit converter

Stone to pounds.

Convert st to lb and lb to st. Type in either box and the other follows. A stone is exactly 14 pounds — the one conversion in this family you can do in your head.

st → lbExact definition
—
Stone to pounds — common values, to 6 significant figures.
stlb
1 st14 lb
2 st28 lb
5 st70 lb
7 st98 lb
8 st112 lb
9 st126 lb
10 st140 lb
11 st154 lb
12 st168 lb
13 st182 lb
14 st196 lb
15 st210 lb
16 st224 lb
18 st252 lb
20 st280 lb
1 st=14 lb 1 lb=0.07142857143 st

Definitions

  • The stone is 14 pounds, exactly 6.350 293 18 kg. UK body weight is normally quoted as stone and pounds — 12 st 4 lb, not 12.29 st.
  • The international avoirdupois pound is exactly 0.453 592 37 kg, agreed in 1959 — which is why pounds and kilograms convert exactly.
  • This conversion is exact by definition. 1 st = 14 lb.
  • Everything here is mass, not force. The pound is defined as exactly 0.453 592 37 kg, so pound-to-kilogram conversion is exact.

How it works

One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.

The value passes through kg, the unit every other mass & weight unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general mass & weight converter always agree.

Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.

Common questions this answers: how many pounds in a stone (14), how many stone in a pound (0.0714286), and what 12 st is in pounds (168 lb).

From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.