Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 oz | 0.437492 gr | |
| 0.01 oz | 4.37492 gr | |
| 0.1 oz | 43.7492 gr | |
| 1 oz | 437.492 gr | |
| 5 oz | 2187.46 gr | |
| 10 oz | 4374.92 gr | |
| 50 oz | 21874.6 gr | |
| 100 oz | 43749.2 gr | |
| 1000 oz | 437492 gr |
The Milligram (mg) and the Gram (g) are both units of weight & mass. Converting between them is straightforward using the formula above.
Formula: 1 oz = 437.4923 gr
This converter uses internationally recognized conversion factors. All calculations are performed client-side in your browser — no data is sent to any server.
| Ounce (oz) | Grain (gr) | Real-world context |
|---|---|---|
| 0.1 oz | 43.7492284 gr | |
| 1 oz | 437.4923 gr | letter envelope |
| 5 oz | 2187.4614 gr | |
| 10 oz | 4374.9228 gr | |
| 100 oz | 43749.2284 gr |
1 ounce (oz) equals exactly 437.4923 grains (gr). Use the formula: oz × 437.4923 = gr.
To convert ounces to grains, multiply your value in ounces by 437.4923. For example, 5 oz × 437.4923 = 2187.4614 gr.
100 ounces = 43749.2284 grains. Calculation: 100 × 437.4923 = 43749.2284.
To convert grains back to ounces, divide by 437.4923 (or multiply by 0.00228575). Example: 10 gr ÷ 437.4923 = 0.02285755 oz.
Yes. This converter uses the internationally recognised exact conversion factor: 1 oz = 437.4923 gr. All calculations are performed in your browser with no rounding until display.
10 ounces = 4374.9228 grains. Simply multiply by 437.4923.
Converting ounces to grains is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses oz and another uses gr.
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 (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 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).
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.