Convert Ounce to Gram
1 ounce = 28.34952 gram (g). For example, 10 ounce = 283.4952 gram and 100 ounce = 2,834.952 gram. Type any value below to convert ounce to gram both ways — it runs entirely in your browser.
Quick answer: Ounce to Gram
1 Ounce = 28.34952 Gram (oz → g). To convert ounce to gram, multiply by 28.34952. To convert gram to ounce, multiply by 0.03527396. The converter at the top does this instantly and both ways; the sections below give the formula, worked examples, a full conversion chart and answers to the most common ounce-to-gram questions.
How to convert Ounce to Gram
To convert ounce to gram, multiply the number of ounce by the conversion factor 28.34952, because 1 oz = 28.34952 g. The conversion is linear, so the same factor works for any value — whole numbers, decimals or fractions. For the reverse direction, 1 g = 0.03527396 oz, so you divide by 28.34952 (or multiply by 0.03527396) to turn gram back into ounce.
g = oz × 28.34952 ·
oz = g × 0.03527396
- Write down the value you want to convert, in ounce.
- Multiply it by 28.34952.
- The result is the same area/length/quantity expressed in gram.
Ounce to Gram — worked examples
Each row shows the exact arithmetic so you can follow the conversion step by step. For example, 5 ounce is 141.7476 gram because 5 oz × 28.34952 = 141.7476 g.
| Ounce | Calculation | Gram |
|---|---|---|
| 1 oz | 1 oz × 28.34952 = 28.34952 g | 28.34952 g |
| 2 oz | 2 oz × 28.34952 = 56.69905 g | 56.69905 g |
| 3 oz | 3 oz × 28.34952 = 85.04857 g | 85.04857 g |
| 5 oz | 5 oz × 28.34952 = 141.7476 g | 141.7476 g |
| 7 oz | 7 oz × 28.34952 = 198.4467 g | 198.4467 g |
| 10 oz | 10 oz × 28.34952 = 283.4952 g | 283.4952 g |
| 12 oz | 12 oz × 28.34952 = 340.1943 g | 340.1943 g |
| 15 oz | 15 oz × 28.34952 = 425.2428 g | 425.2428 g |
| 20 oz | 20 oz × 28.34952 = 566.9905 g | 566.9905 g |
| 25 oz | 25 oz × 28.34952 = 708.7381 g | 708.7381 g |
| 50 oz | 50 oz × 28.34952 = 1,417.476 g | 1,417.476 g |
| 100 oz | 100 oz × 28.34952 = 2,834.952 g | 2,834.952 g |
Common Ounce to Gram conversions
These are the ounce-to-gram values people look up most often. Every figure is computed from the exact factor, so you can rely on them for quick reference:
- 1 ounce = 28.34952 gram
- 2 ounce = 56.69905 gram
- 2.5 ounce = 70.87381 gram
- 3 ounce = 85.04857 gram
- 4 ounce = 113.3981 gram
- 5 ounce = 141.7476 gram
- 6 ounce = 170.0971 gram
- 7 ounce = 198.4467 gram
- 8 ounce = 226.7962 gram
- 9 ounce = 255.1457 gram
- 10 ounce = 283.4952 gram
- 12 ounce = 340.1943 gram
- 15 ounce = 425.2428 gram
- 20 ounce = 566.9905 gram
- 25 ounce = 708.7381 gram
- 30 ounce = 850.4857 gram
- 50 ounce = 1,417.476 gram
- 75 ounce = 2,126.214 gram
- 100 ounce = 2,834.952 gram
- 200 ounce = 5,669.905 gram
- 500 ounce = 14,174.76 gram
- 1000 ounce = 28,349.52 gram
Ounce to Gram conversion chart (both directions)
The chart below converts ounce to gram and gram to ounce side by side, so it works whichever way you need. 1 ounce = 28.34952 gram, and 1 gram = 0.03527396 ounce.
| Ounce → Gram | Gram → Ounce |
|---|---|
| 0.25 oz = 7.087381 g | 0.25 g = 0.00881849 oz |
| 0.5 oz = 14.17476 g | 0.5 g = 0.01763698 oz |
| 1 oz = 28.34952 g | 1 g = 0.03527396 oz |
| 2 oz = 56.69905 g | 2 g = 0.07054792 oz |
| 3 oz = 85.04857 g | 3 g = 0.1058219 oz |
| 4 oz = 113.3981 g | 4 g = 0.1410958 oz |
| 5 oz = 141.7476 g | 5 g = 0.1763698 oz |
| 6 oz = 170.0971 g | 6 g = 0.2116438 oz |
| 7 oz = 198.4467 g | 7 g = 0.2469177 oz |
| 8 oz = 226.7962 g | 8 g = 0.2821917 oz |
| 9 oz = 255.1457 g | 9 g = 0.3174657 oz |
| 10 oz = 283.4952 g | 10 g = 0.3527396 oz |
| 12 oz = 340.1943 g | 12 g = 0.4232875 oz |
| 15 oz = 425.2428 g | 15 g = 0.5291094 oz |
| 20 oz = 566.9905 g | 20 g = 0.7054792 oz |
| 25 oz = 708.7381 g | 25 g = 0.881849 oz |
| 30 oz = 850.4857 g | 30 g = 1.058219 oz |
| 40 oz = 1,133.981 g | 40 g = 1.410958 oz |
| 50 oz = 1,417.476 g | 50 g = 1.763698 oz |
| 75 oz = 2,126.214 g | 75 g = 2.645547 oz |
| 100 oz = 2,834.952 g | 100 g = 3.527396 oz |
| 150 oz = 4,252.428 g | 150 g = 5.291094 oz |
| 200 oz = 5,669.905 g | 200 g = 7.054792 oz |
| 250 oz = 7,087.381 g | 250 g = 8.81849 oz |
| 500 oz = 14,174.76 g | 500 g = 17.63698 oz |
| 1000 oz = 28,349.52 g | 1000 g = 35.27396 oz |
Ounce vs Gram: which is bigger?
A ounce is the larger unit: one ounce equals 28.34952 grams. Put another way, you need 28.34952 grams to make a single ounce.
What is a Ounce? History, origin and usage
The ounce comes from the Latin uncia, meaning a twelfth part — originally a twelfth of the Roman libra. English later reorganised its weights around the avoirdupois system, in which the pound is divided into sixteen ounces rather than twelve, and that sixteenth is the ounce used for ordinary goods today.
Ounces are used for food packaging, recipes, letters and small parcels in the United States, and for some foods and postal rates in the United Kingdom. Recipe writers use them constantly for butter, flour and cheese.
The same Latin root uncia also gave English the word "inch" — a twelfth of a foot. Confusingly, the troy ounce used for gold is a different and heavier ounce, and a "fluid ounce" is a measure of volume, not weight at all.
What is a Gram? History, origin and usage
The gram was defined in 1795 as the mass of one cubic centimetre of water at the melting point of ice. It was meant to be the everyday unit, with the kilogram as a bulk multiple — but the kilogram turned out to be the more practical size for a physical standard, so the two swapped roles and the gram became the derived one.
Grams are the normal unit for food, recipes, spices, postage, jewellery and laboratory work — anything too small to weigh comfortably in kilograms. Nutrition labels almost everywhere give protein, fat and sugar in grams.
The gram was the base unit of the old CGS (centimetre-gram-second) system used in physics before SI took over. A gram is roughly the mass of a paperclip, or of one millilitre of water.
Convert 1 Ounce to other units
It can help to see a ounce next to the other units it is commonly compared with. One ounce (oz) is equal to:
| 1 Ounce equals | Unit |
|---|---|
| 0.02834952 kg | Kilogram |
| 28.34952 g | Gram |
| 28,349.52 mg | Milligram |
| 28,349,520 µg | Microgram |
| 0.00002834952 t | Tonne |
| 0.0002834952 q | Quintal |
| 0.0625 lb | Pound |
| 0.004464286 st | Stone |
| 0.00003125 ton (US) | Short ton |
| 0.00002790179 ton (UK) | Long ton |
| 0.9114583 oz t | Troy ounce |
| 437.5 gr | Grain |
| 141.7476 ct | Carat |
Convert 1 Gram to other units
One gram (g) is equal to:
| 1 Gram equals | Unit |
|---|---|
| 0.001 kg | Kilogram |
| 1,000 mg | Milligram |
| 1,000,000 µg | Microgram |
| 0.000001 t | Tonne |
| 0.00001 q | Quintal |
| 0.002204623 lb | Pound |
| 0.03527396 oz | Ounce |
| 0.000157473 st | Stone |
| 0.000001102311 ton (US) | Short ton |
| 0.0000009842065 ton (UK) | Long ton |
| 0.03215075 oz t | Troy ounce |
| 15.43236 gr | Grain |
| 5 ct | Carat |
Tips for converting Ounce to Gram
- To go from ounce to gram, multiply by 28.34952; to go back, divide by 28.34952 (or multiply by 0.03527396).
- For a quick mental estimate, remember that 1 ounce ≈ 28.34952 gram, so 10 ounce ≈ 283.4952 gram.
- The converter above keeps full precision; the tables round for readability, so use the tool for exact figures.
- Both fields update live as you type — change either side to convert in that direction.
How to use this Ounce to Gram converter
Type a number into the Ounce field and the equivalent in Gram appears instantly — there is no “convert” button to press and nothing is sent to a server, so it works offline once the page has loaded and is safe for any data. You can also type into the Gram field to convert the other way (gram to ounce). Use the swap control to flip the two units, and copy the result with a single click. Because the calculation runs in your browser with full floating-point precision, the converter is more exact than the rounded figures shown in the reference chart above — use the chart for quick look-ups and the tool for precise work.
Accuracy and method
Every figure on this page — the formula, the worked examples, the conversion chart and the “convert to other units” tables — is computed from a single verified conversion factor (1 oz = 28.34952 g), never copied from a hand-typed lookup table that could drift. That factor is derived from each unit’s definition in terms of a common base unit, and an automated check re-verifies all of the site’s factors on every update, so the numbers here stay correct over time. This matters for ounce-to-gram conversions because a small rounding error in a published table compounds quickly at larger quantities; computing from the exact factor avoids that.
Sources
- NIST Special Publication 811 — Guide for the Use of the SI — publishes the exact metric equivalents of the customary weight units. The 1959 international yard-and-pound agreement fixes the international avoirdupois pound at exactly 0.453 592 37 kilogram, and the ounce, stone, grain and both tons are defined as exact fractions or multiples of that pound — so every imperial weight on this page is exact, not rounded.
- BIPM — The International System of Units (SI Brochure) — the defining document for the SI, published by the International Bureau of Weights and Measures. It fixes the base unit that this conversion resolves to, which is why the factor here can be exact rather than approximate.
Weight factors here are exact, anchored to the kilogram: the international pound is exactly 0.45359237 kg, a stone is 14 pounds, a short ton is 2,000 pounds and a long ton is 2,240, a grain is 1/7000 of a pound and a metric carat is exactly 200 mg. So the live tool and every number on this page always agree.
Frequently asked questions
- How many gram are in 1 ounce?
- 1 ounce = 28.34952 gram (g). To convert any number of ounce to gram, multiply by 28.34952.
- How do I convert ounce to gram?
- Multiply the number of ounce by 28.34952. For example, 10 ounce = 10 × 28.34952 = 283.4952 gram, and 25 ounce = 708.7381 gram.
- How many ounce are in 1 gram?
- 1 gram = 0.03527396 ounce. So to convert gram back to ounce, multiply by 0.03527396.
- What is the formula to convert ounce to gram?
- gram = ounce × 28.34952. The reverse formula is ounce = gram × 0.03527396.
- How much is 100 ounce in gram?
- 100 ounce = 2,834.952 gram. (And 1000 ounce = 28,349.52 gram.)
- Which is bigger, a ounce or a gram?
- A ounce is larger: 1 ounce = 28.34952 gram.
- Is this ounce to gram converter accurate?
- Yes — every value is computed from the exact 28.34952 g per oz factor (not rounded look-up tables), and the factors are re-verified automatically on every update.
- Can I convert gram to ounce too?
- Yes. The converter works both ways — enter a value in either field. 1 gram = 0.03527396 ounce.