Pounds and Ounces Calculator
Our free volume & weight converter handles poundsand ounces conversions. See tables, ratios, and examples for quick reference.
Pounds and Ounces Calculator
Calculator
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Formula: Total Ounces = (Pounds x 16) + Ounces
Worked example — 7 lb 11 oz = 3,486.99 g = 3.487 kg
Formula
Total Ounces = (Pounds x 16) + Ounces
There are 16 ounces per pound. Multiply pounds by 16 and add remaining ounces for total ounces. Multiply total ounces by 28.3495 for grams. Divide total pounds by 14 for stones.
Worked Examples
Example 1: Baby Weight Conversion
Problem:A baby weighs 7 lb 11 oz. Convert to grams and kilograms.
Solution:Total ounces = (7 x 16) + 11 = 123 oz Grams = 123 x 28.3495 = 3,486.99 g Kilograms = 3,486.99 / 1000 = 3.487 kg
Result:7 lb 11 oz = 3,486.99 g = 3.487 kg
Example 2: Package Weight Addition
Problem:Two packages weigh 2 lb 14 oz and 1 lb 10 oz. What is the total?
Solution:Ounces: 14 + 10 = 24 oz = 1 lb 8 oz Pounds: 2 + 1 + 1 = 4 lb Total: 4 lb 8 oz = 72 oz Grams: 72 x 28.3495 = 2,041.16 g
Result:Total = 4 lb 8 oz (2,041.16 g)
Frequently Asked Questions
How many ounces are in a pound?
There are exactly 16 ounces in 1 pound (avoirdupois). This is the standard used for measuring food, people, packages, and most everyday items. To convert pounds to ounces, multiply by 16. To convert ounces to pounds, divide by 16. For example, 5 pounds equals 80 ounces, and 24 ounces equals 1.5 pounds. This relationship has been standard in the imperial and US customary systems for centuries.
How do I convert pounds and ounces to grams?
First convert everything to ounces by multiplying pounds by 16 and adding any remaining ounces. Then multiply the total ounces by 28.3495 to get grams. For example, 3 lb 4 oz equals 52 ounces total (3 x 16 + 4), and 52 x 28.3495 = 1,474.17 grams. Alternatively, you can convert pounds to grams directly by multiplying by 453.592, then add ounces multiplied by 28.3495.
How do I add weights in pounds and ounces?
Add the ounces together first, then add the pounds. If the ounces total 16 or more, convert the excess to pounds. For example, 3 lb 12 oz plus 2 lb 9 oz: first add ounces (12 + 9 = 21 oz), then convert 21 oz to 1 lb 5 oz, then add pounds (3 + 2 + 1 = 6 lb). The result is 6 lb 5 oz. Pounds and Ounces Calculator handles the carrying automatically so you do not need to do the mental math yourself.
What is the relationship between pounds, stones, and kilograms?
One stone equals 14 pounds, and one kilogram equals approximately 2.2046 pounds. Stones are commonly used in the UK and Ireland for body weight. To convert pounds to stones, divide by 14. For example, 168 pounds equals 12 stones exactly. To convert to kilograms, multiply pounds by 0.453592. The same 168 pounds equals about 76.2 kilograms. Hospital and medical settings worldwide increasingly use kilograms for weight measurements.
How do I turn a decimal pound figure into pounds and ounces?
Keep the whole number as the pounds, then multiply the decimal remainder by 16 to get ounces. A reading of 3.4 pounds becomes 3 pounds plus 0.4 x 16 = 6.4 ounces. Working the other way, divide the ounces by 16 and add the result to the pounds. Digital scales that display decimal pounds are the usual reason this step is needed, and rounding the ounces to one decimal keeps the result honest.
What is the difference between an avoirdupois ounce and a troy ounce?
The everyday avoirdupois ounce used for food and parcels is 28.3495 grams, and 16 of them make a pound of 453.592 grams. The troy ounce, used for precious metals, is heavier at 31.1035 grams, and a troy pound contains only 12 troy ounces, totalling 373.24 grams. Mixing the systems inflates a quoted gold or silver mass by about 10 percent per ounce, so always confirm which ounce a weight refers to.
Why is the stone still used for body weight in the UK?
The stone is a customary British unit equal to 14 pounds, or 6.35029 kilograms, and it survives in everyday conversation because it puts adult body weights into a convenient one or two digit range. A weight of 11 stone 4 pounds is 158 pounds, or 71.7 kilograms. Clinical records in the UK use kilograms, so converting through total pounds is the safe route when moving between a conversation and a chart.
How do I subtract one pounds-and-ounces weight from another?
Convert both weights to total ounces, subtract, then convert back by dividing by 16 for whole pounds and keeping the remainder as ounces. If you prefer to work in place, borrow 16 ounces from the pounds column when the ounces being subtracted are larger: 5 pounds 3 ounces minus 2 pounds 9 ounces becomes 4 pounds 19 ounces minus 2 pounds 9 ounces, which is 2 pounds 10 ounces.
What do net weight and gross weight mean on a package?
Net weight is the contents alone, gross weight is contents plus packaging, and the difference between them is the tare. Shipping rates and postal brackets are set on gross weight, while labelling declarations quote net. When you weigh a filled box and want the net figure, weigh the empty packaging separately and subtract. Expressing both in total ounces first makes the subtraction straightforward before converting back.
Is an ounce of liquid the same as an ounce of weight?
No, and the shared name causes real errors. The fluid ounce is a volume, about 29.57 millilitres in US usage, while the avoirdupois ounce on this page is a mass of 28.3495 grams. They coincide only for a substance whose density happens to make them match, which water very nearly does. For flour, oil or syrup they diverge sharply, so a recipe calling for 8 oz of an ingredient must be read carefully: on a scale it means mass, in a measuring jug it means volume.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator · Editorial policy
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