Pounds and Ounces Converter
With weight 3500 g, pounds and ounces converter comes to 7 lb 11.5 oz — weight. It is reached in 5 steps, the last of which is weight / 453.59237, and each one is printed on the page with its numbers filled in. The formula is the one published by NIST, not an approximation fitted to it.
A weight in grams or kilograms as pounds and ounces — the two-unit reading a hospital chart and a kitchen scale actually give.
By Alex Seote, Built and maintains Rule Calculator · Formula and sources checked · How we check
Weight 3500 g
7 lb 11.5 oz
Weight for the example below. Editing a field recomputes the calculator below; this figure holds the answer the page was loaded with.
It is written into the HTML rather than drawn by a script, so a search engine reading this page without running JavaScript still finds an answer.
- Total pounds
weight / 453.592377.716 lb- Whole pounds
floor(total_pounds)7 lb- Remaining ounces
(total_pounds - floor(total_pounds)) * 1611.459 oz- The same weight in ounces alone
weight / 28.349523125123.459 oz- Grams
weight3,500 g
Worked example
3,500 g is 7.716 pounds, which is where most converters stop. A chart says 7 lb 11.5 oz: seven whole pounds, and the 0.716 left over multiplied by sixteen. Nobody weighs a baby in hundredths of a pound, and the remainder is the part that answers the question.
How to work it out yourself
- 1.Enter the weight and pick its unit. Grams and kilograms both work, and so do pounds if you want the ounces broken out of a decimal you already have.
- 2.The whole pounds come from the division; the ounces are what is left over, multiplied by sixteen. That second step is the one a decimal answer throws away.
- 3.A pound is exactly 0.45359237 kilograms by definition, so nothing here is a measurement and nothing drifts: the same grams give the same pounds and ounces every time.
Grams to pounds and ounces
| Weight (g) | Weight |
|---|---|
| 2000 | 4 lb 6.5 oz |
| 2500 | 5 lb 8.2 oz |
| 2750 | 6 lb 1 oz |
| 3000 | 6 lb 9.8 oz |
| 3250 | 7 lb 2.6 oz |
| 3500 | 7 lb 11.5 oz |
| 3750 | 8 lb 4.3 oz |
| 4000 | 8 lb 13.1 oz |
| 4250 | 9 lb 5.9 oz |
| 4500 | 9 lb 14.7 oz |
| 5000 | 11 lb 0.4 oz |
The range a birth weight falls in. 2,500 g is the threshold below which a baby is called low birth weight, and 4,000 g the one above which it is called large.
The formula
- Total pounds
weight / 453.59237 - Whole pounds
floor(total_pounds) - Remaining ounces
(total_pounds - floor(total_pounds)) * 16 - The same weight in ounces alone
weight / 28.349523125 - Grams
weight
Source: NIST — the pound is exactly 0.45359237 kg, BIPM — International System of Units
Questions people actually ask
- Why not just say 7.72 pounds?
- Because no scale, chart or midwife says it that way. A weight in the US and UK is given as whole pounds and the ounces left over, and 0.72 of a pound is 11.5 ounces. The decimal is the same number and the wrong form of it.
- How many ounces are in a pound?
- Sixteen, exactly, and that is why the remainder is multiplied by sixteen rather than by a hundred. The commonest mistake in this conversion is treating 0.5 lb as 50 oz-worth of something instead of 8 oz.
- Is the pound exact or measured?
- Exact. Since 1959 the international avoirdupois pound has been defined as 0.45359237 kilograms, a fixed number rather than the result of comparing two weights. Every figure on this page follows from that definition.
- What counts as a low or high birth weight?
- Below 2,500 g — 5 lb 8 oz — is termed low birth weight, and above 4,000 g — 8 lb 13 oz — large for gestational age. Those are descriptive thresholds used in record-keeping rather than a verdict about a particular baby, and the table above brackets both.
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