Last updated: November 18, 2025
Grams to ounces explained
Science labs live in grams, while kitchen recipes and postal labels often list ounces or pounds. This calculator normalizes every entry to grams (the SI base mass), then converts into ounces, pounds, kilograms, or milligrams using exact NIST factors so you never lose precision.
How the conversion works
Key constants:
We simply multiply by the source-to-gram factor and divide by the target-to-gram factor.
Units and conversions
| Unit | Relation |
|---|---|
| Gram (g) | Base calculator unit |
| Kilogram (kg) | |
| Milligram (mg) | |
| Ounce (oz) | |
| Pound (lb) |
Worked examples
- Baking conversion
Convert 180 g of flour to ounces.
Result: scoop roughly 6.35 oz.
- Shipping label
A parcel weighs 24 oz. Express it in grams for a customs form.
Result: declare 0.68 kg.
Tips and pitfalls
- Watch for avoirdupois vs troy ounces—this tool uses the common avoirdupois ounce (28.3495 g) used in cooking and shipping.
- Convert to grams before summing multiple ingredients; metric addition avoids rounding errors from fractional ounces.
- For nutritional labels, round to the precision the regulation requires (often nearest gram) even if internal calculations carry more decimals.
- When measuring precious metals, switch to the troy ounce (31.1034768 g) instead of the avoirdupois ounce—this tool focuses on everyday mass units.