Equivalent mass units
The main result shows the same mass in the selected target unit. The comparison table gives additional equivalents without changing the original quantity. Although commonly called weight conversion, these units measure mass; the calculator does not calculate a gravitational force.
For an adult height-and-weight calculation after checking units, the BMI Calculator accepts kilograms or pounds directly.
The formula
Kilograms provide the common basis. One international avoirdupois pound equals 0.45359237 kg, one avoirdupois ounce is one sixteenth of that pound, and one stone equals fourteen pounds. The metric tonne option means 1,000 kg. Mixed entries combine pounds + ounces/16 or stones × 14 + extra pounds before applying the international pound factor.
One pound in kilograms
Enter 1, choose Avoirdupois pounds as From, and Kilograms as To. The result is 0.45359237 kg, equivalent to 453.59237 grams or 16 avoirdupois ounces.
How to use this calculator
- Choose decimal mass, pounds/ounces or stones/pounds and enter the active fields.
- Choose the target unit and read the live mass equivalents.
- Reverse reuses the converted amount in decimal mode; Reset restores the original example.
Mass conversion does not depend on local gravity
A package containing one kilogram of material retains that mass when moved between locations. Its gravitational force can vary, but converting kilograms to pounds here does not need a gravity input.
Force measurements such as newtons or pound-force are therefore absent. Converting a force into a mass would require a separate physical assumption about acceleration.
Ounces and tons need an explicit definition
The ounce on this page is the avoirdupois mass ounce used with ordinary pounds. It is not a fluid ounce, which measures volume, or a troy ounce used in some precious-metal contexts.
The tonne is metric and equals 1,000 kilograms. U.S. short tons and imperial long tons are not included. A label that says only ton should be clarified before using it as a source measurement.
Use the two parts written on the scale
Two pounds eight ounces equals 2.5 lb or 1.133980925 kg. Eleven stones four pounds equals 158 lb or 71.66759446 kg. Major units are whole numbers, while the smaller part may be decimal; the full rollover value is allowed.
Changing methods retains all three entry sets. Reverse this conversion uses the converted amount in decimal mode and retains the same mass, with mixed entries still available. Amounts beyond the input range are left unchanged with a message.
Assumptions & limitations
What this calculation assumes
- Values are nonnegative and use one of the listed mass units.
- Pounds and ounces use the international avoirdupois system.
What to keep in mind
- Fluid ounces, troy ounces, short tons, and long tons are not supported.
- Output uses up to twelve significant digits; it does not increase the precision of a weighing instrument.
Common questions
Can this convert flour grams to cups?
No. Cups measure volume, so that conversion depends on density and packing. A fixed mass-to-volume factor would not apply to every ingredient.
How many pounds are in a stone?
One stone equals fourteen avoirdupois pounds.
Can I enter pounds and ounces together?
Yes. Choose Pounds and ounces and enter whole pounds plus 0 to 16 additional ounces. Stones and pounds is also available; decimal mode accepts any listed source unit.
Sources & further reading
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