Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 gr | 2.28575e-06 oz | |
| 0.01 gr | 2.28575e-05 oz | |
| 0.1 gr | 0.000228575 oz | |
| 1 gr | 0.00228575 oz | |
| 5 gr | 0.0114288 oz | |
| 10 gr | 0.0228575 oz | |
| 50 gr | 0.114288 oz | |
| 100 gr | 0.228575 oz | |
| 1000 gr | 2.28575 oz |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 gr = 0.002285755 oz
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Grain (gr) | Ounce (oz) | Real-world context |
|---|---|---|
| 1 gr | 0.00228575 oz | grain of wheat |
| 100 gr | 0.22857546 oz | |
| 1000 gr | 2.2857546 oz | |
| 10000 gr | 22.857546 oz | |
| 100000 gr | 228.5755 oz |
1 grain (gr) equals exactly 0.00228575 ounces (oz). Use the formula: gr × 0.00228575 = oz.
To convert grains to ounces, multiply your value in grains by 0.00228575. For example, 5 gr × 0.00228575 = 0.01142877 oz.
100 grains = 0.22857546 ounces. Calculation: 100 × 0.00228575 = 0.22857546.
To convert ounces back to grains, divide by 0.00228575 (or multiply by 437.4923). Example: 10 oz ÷ 0.00228575 = 4374.9228 gr.
Yes. This converter uses the internationally recognised exact conversion factor: 1 gr = 0.00228575 oz. All calculations are performed in your browser with no rounding until display.
10 grains = 0.02285755 ounces. Simply multiply by 0.00228575.
Converting grains to ounces is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses gr and another uses oz.
The grain (gr) is the smallest unit in the avoirdupois, troy, and apothecary weight systems, equal to exactly 64.79891 milligrams (0.06479891 g). All three systems share the same grain as base: one avoirdupois pound = 7,000 grains; one troy pound = 5,760 grains. The grain is still used in ballistics (bullet and powder weights) and some pharmaceutical contexts.
The avoirdupois ounce (oz) equals exactly 28.349523125 grams or 1/16 of an avoirdupois pound. It is widely used in the US and UK for food portions, product packaging, and everyday measurements. Note that the troy ounce (31.1035 g), used for precious metals like gold and silver, is a different and heavier unit than the avoirdupois ounce.
The grain is among the oldest measurement units in history, derived from the average weight of a grain of barleycorn (or wheat) — a practical standard used in ancient Egypt, Greece, and Rome. England formalised the barleycorn grain in the 15th century as the foundation of its weight system. The British Weights and Measures Act 1824 defined the grain, and the value remains unchanged today.
Interesting fact: The original grain was calibrated by laying dried barleycorns end-to-end — 32 grains equalled one inch in 13th-century England. Today, 9mm pistol bullets typically weigh 115–147 grains (7.5–9.5 g), and gunpowder charges are specified in grains for reloading.
The word "ounce" derives from Latin uncia (a twelfth), originally 1/12 of the Roman pound. The avoirdupois ounce developed in medieval England specifically for the wool trade, creating a 16-ounce pound distinct from the Troy 12-ounce pound. The British Imperial system codified the ounce in 1824. The modern exact definition (28.349523125 g) was set by the 1959 International Yard and Pound Agreement.
Interesting fact: A troy ounce (31.1 g) used for gold is heavier than an avoirdupois ounce (28.35 g) used for food — so an "ounce" of gold contains more metal than an "ounce" of flour. A standard large hen's egg weighs approximately 56–63 grams (about 2 oz).