Stones to Pounds converter (st → lb)

st to lb formula

Worked example: 10 st = 140 lb. The defining value behind this factor is documented on our mass & weight standards page.

Stones to Pounds chart

Includes standard reference values plus the specific numbers people search for most.

Most-searched st to lb answers

When to convert st to lb

• ▸Body weight tracking — bathroom scales, BMI calculators and airline check-in all mix st and lb; 20 st is the value you enter, lb is what the app stores.
• ▸Gym & powerlifting — plates are labelled in st in US gyms and lb in European gyms; a 20 st lift is the same load, different label.
• ▸Cooking & baking — recipes from the US use st while European recipes use lb; 20 st of flour = the lb value your kitchen scale shows.
• ▸Shipping & parcel weight — courier calculators (FedEx, DHL, USPS) accept either unit; entering the wrong one can double your shipping cost.
• ▸Medicine dosing — drug doses are calculated per kg; if your weight is in st, converting to lb is often the first step.

Common mistakes

• ✕Confusing pounds (lb) with pound-force or with the British stone (1 st = 14 lb).
• ✕Rounding too aggressively — 1 lb = 0.4536 kg, not 0.45 kg; the error compounds on large weights.
• ✕Using US "cups" for solid weight — cups are a volume unit, not a mass unit.
• ✕Short ton, long ton and tonne are three different units. A US short ton is 2000 lb = 907.18474 kg. A UK long ton is 2240 lb = 1016.0469088 kg. A metric tonne is 1000 kg. Freight and commodity figures are wrong by up to 12% if these are mixed up.

Regional usage & source

Kilograms and grams are the global standard for mass. Pounds and ounces remain common in the US. The UK still uses stone (1 st = 14 lb) for body weight in everyday speech.

Reference: 1 pound (avoirdupois) = exactly 0.45359237 kilograms per the 1959 international yard and pound agreement (NIST Handbook 44).

How these numbers are produced and rounded: methodology.

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