Grams To Oz Calculator
Converting a recipe weight, a parcel or a nutrition label between grams and ounces takes one exact factor: 1 ounce is 28.349523125 grams by definition. This converter runs in both directions, lets you set the decimal precision from 0 to 8 places, and reports the same weight in pounds, kilograms and milligrams alongside the headline result, with the step-by-step working shown under every answer.
This tool uses the international avoirdupois ounce: 1 oz = 28.349523125 g exactly, in both directions. Precious metals use the heavier troy ounce (about 31.1035 g) and need a different converter.
Quick Answer
Divide grams by 28.349523125 to get ounces. The worked example pre-filled above: 500 g = 17.6370 oz, which is also 1.1023 lb, 0.5000 kg and 500000.00 mg. In reverse, 16 oz = 453.5924 g, exactly one pound, because both directions now use the same exact factor.
Key takeaways
- One factor does everything: 1 oz = 28.349523125 g exactly. Divide going to ounces, multiply coming back, and the two directions round-trip with no drift.
- Precision is yours to set, 0 to 8 decimal places. Two decimals cover nearly all cooking; keep 4 or more for postage, jewellery and lab work.
- Every result also shows pounds, kilograms and milligrams, so a single conversion usually ends the job.
- This is the avoirdupois ounce on food labels and postal scales. Gold and silver use the troy ounce, about 9.7 percent heavier.
How to use the Grams to Ounces Converter
Choose a direction, set the decimals, enter the weight and click Convert. The results stay hidden until you convert, and the working is printed under the answer so you can check it.
- Pick the direction: grams to ounces for recipes, labels and parcels weighed in metric; ounces to grams when a US recipe or scale reading needs to land in grams. Switching direction clears the typed value, matching the tool’s long-standing behaviour.
- Set the decimal places: the default 4 suits most jobs. Drop to 1 or 2 for cooking, raise to 6 or 8 when small errors would compound across a large batch.
- Enter the weight: zero is accepted and converts to zero in every unit; negative values and blank boxes return a short message naming the problem.
- Read the full result: the headline conversion plus ounces, grams, pounds, kilograms and milligrams, the step-by-step substitution, and a reverse check. Copy or Share sends the whole set as one line of text. Reset restores the 500 g worked example.
Weight is only half of most kitchen conversions. When the next question is volume rather than weight, the gram to cup calculator handles the density-dependent step, and for dry ingredients already in ounces the dry oz to cups calculator covers the cup side directly.
The formula and why the factor is exact
Ounces = grams ÷ 28.349523125, and grams = ounces × 28.349523125. The long decimal is not a measurement; it is a definition, fixed by the international yard and pound agreement and recorded in the NIST Guide for the Use of the International System of Units (SP 811): the pound is exactly 0.45359237 kilograms, and one sixteenth of that is 28.349523125 grams.
An earlier version of this tool multiplied by the rounded 28.3495 in the ounces-to-grams direction while dividing by the exact factor in the other direction. The shortcut is invisible at 1 oz and wrong at scale: 16 oz came out as 453.5920 g instead of the exact 453.5924 g, and 1,000 oz was short by 0.0231 g. Both directions now use the exact factor, so a conversion and its reverse cancel perfectly. The familiar shorthand of 28 g to the ounce still has a place at the stove; it runs about 1.2 percent light, which no biscuit will notice and no shipping label should carry.
| Grams | Ounces | Pounds | Everyday anchor |
|---|---|---|---|
| 1 g | 0.0353 oz | 0.0022 lb | A paperclip, a dollar bill |
| 10 g | 0.3527 oz | 0.0220 lb | Two nickels |
| 28.3495 g | 1.0000 oz | 0.0625 lb | One ounce exactly |
| 100 g | 3.5274 oz | 0.2205 lb | A standard chocolate bar |
| 250 g | 8.8185 oz | 0.5512 lb | A European butter block |
| 500 g | 17.6370 oz | 1.1023 lb | A bag of pasta |
| 1,000 g | 35.2740 oz | 2.2046 lb | One kilogram |
Worked examples in both directions
Grams to ounces. A recipe calls for 500 g of flour. Divide: 500 ÷ 28.349523125 = 17.6370 oz. The same result reports 1.1023 lb, 0.5000 kg and 500000.00 mg, and the check line multiplies back: 17.6370 oz × 28.349523125 = 500.0000 g.
Ounces to grams. A US recipe lists 16 oz of flour. Multiply: 16 × 28.349523125 = 453.5924 g, exactly one pound (0.4536 kg in the tool’s 4-decimal display). A smaller check: 8 oz = 226.7962 g, the weight printed on a standard half-pound butter quantity across two sticks. Both examples reproduce exactly in the converter with the direction set to Ounces to Grams.
Avoirdupois, troy and fluid ounces are three different things
The ounce in this calculator is the avoirdupois weight ounce used for food, parcels and body weight. Two other units share the name and cause most conversion mistakes. The troy ounce (31.1034768 g) prices gold, silver and platinum, so a troy conversion here would understate a metal weight by about 9.7 percent. The fluid ounce measures volume, not weight: 8 fluid ounces of water happen to weigh close to 8.5 weight ounces, and 8 fluid ounces of flour weigh barely 4.5. If a recipe gives fluid ounces for a dry ingredient, convert by ingredient density instead; the grams to mass calculator covers the wider mass-unit family when the job grows past ounces.
What competing calculators miss
The grams to ounces keyword is crowded with fast, thin converters. The gaps that show up across the top results:
- UnitTables and BakingScalePro: quick answers and handy baking notes, but both work with the rounded 28.3495 or 28.35 factor and neither shows a reverse check, so a rounded reverse conversion quietly disagrees with the forward one.
- MiniWebTool: the strongest rival, with the exact factor, a visual scale and troy guidance. It still separates its views across steps and offers no precision control, which matters for small weights under a gram.
- HomeEdit: a long static table out to 500 g and little else; any value off the table means doing the division yourself, and the table itself is printed at 3 decimals.
- A2Z Tools: a clean two-box instant converter with a decimals option. Instant is convenient, but there is no worked example, no step display and no companion units, so a typo has nothing to catch it.
- The gap this page fills: the exact NIST factor in both directions with a printed reverse check, precision from 0 to 8 decimals, pounds, kilograms and milligrams in the same result, and the troy and fluid ounce traps named before they cost anyone money.
Frequently asked questions
One avoirdupois ounce is exactly 28.349523125 grams. Multiply ounces by 28.349523125 to convert to grams.
One gram is 0.035274 ounces. Divide grams by 28.349523125, or multiply by 0.035274 for a close mental estimate.
500 grams is 17.6370 ounces, which is also 1.1023 pounds and 0.5000 kilograms. It is the pre-filled worked example in the converter above.
No. 28 grams is 0.9877 ounces, about 1.2 percent short of a full ounce. The shorthand is fine for everyday cooking, but use 28.349523125 grams per ounce for postage, trade or lab work.
An avoirdupois ounce is 28.349523125 grams and is used for food, parcels and everyday weights. A troy ounce is 31.1034768 grams and is used only for precious metals such as gold and silver. This converter uses the avoirdupois ounce.
Divide grams by 453.59237, or convert to ounces first and divide by 16. The converter shows the pound value automatically with every result, so no second step is needed.
Yes. Both directions use the exact factor 28.349523125, so converting 500 grams to 17.6370 ounces and converting back returns 500.0000 grams. An earlier version used the rounded factor 28.3495 for ounces to grams, which made 16 ounces read 453.5920 grams instead of the exact 453.5924 grams.
For cooking, 1 or 2 decimals is plenty: 250 grams reads 8.82 ounces at 2 decimals. For science, postage or trade work, use 4 to 8. The converter defaults to 4 decimals.
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References
- National Institute of Standards and Technology. Guide for the Use of the International System of Units (SI), SP 811, Appendix B conversion factors. Accessed October 21, 2026.
- Bureau International des Poids et Mesures (BIPM). The International System of Units (SI Brochure). Accessed October 21, 2026.
- National Institute of Standards and Technology. Handbook 44, Appendix C: General Tables of Units of Measurement. Accessed October 21, 2026.
- Encyclopaedia Britannica. Ounce (unit of weight). Accessed October 21, 2026.
- Encyclopaedia Britannica. Pound (unit of weight). Accessed October 21, 2026.
- National Institute of Standards and Technology, Physical Measurement Laboratory. Special Publication 811: Guide for the Use of the International System of Units (SI). Accessed October 21, 2026.