Convert weight and mass units — kilograms, pounds, grams, ounces, tons, carats and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 gr | 6.48e-05 g | |
| 0.01 gr | 0.000648 g | |
| 0.1 gr | 0.00648 g | |
| 1 gr | 0.0648 g | |
| 5 gr | 0.324 g | |
| 10 gr | 0.648 g | |
| 50 gr | 3.24 g | |
| 100 gr | 6.48 g | |
| 1000 gr | 64.8 g |
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 = 0.0648 g
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) | Gram (g) | Real-world context |
|---|---|---|
| 1 gr | 0.0648 g | grain of wheat |
| 10 gr | 0.648 g | |
| 100 gr | 6.48 g | |
| 500 gr | 32.4 g | |
| 1000 gr | 64.8 g |
1 grain (gr) equals exactly 0.0648 grams (g). Use the formula: gr × 0.0648 = g.
To convert grains to grams, multiply your value in grains by 0.0648. For example, 5 gr × 0.0648 = 0.324 g.
100 grains = 6.48 grams. Calculation: 100 × 0.0648 = 6.48.
To convert grams back to grains, divide by 0.0648 (or multiply by 15.4320988). Example: 10 g ÷ 0.0648 = 154.321 gr.
Yes. This converter uses the internationally recognised exact conversion factor: 1 gr = 0.0648 g. All calculations are performed in your browser with no rounding until display.
10 grains = 0.648 grams. Simply multiply by 0.0648.
Converting grains to grams is commonly needed for jewellery valuation, gemstone trading, precious metal buying and selling, and hallmarking compliance where one system uses gr and another uses g.
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 gram (g) is a unit of mass in the metric system equal to one-thousandth of a kilogram (0.001 kg). While the kilogram is the SI base unit, the gram is the practical everyday unit for small masses in cooking, pharmacy, chemistry, and nutrition labelling. The word derives from Late Latin gramma (small weight), itself from Greek.
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.
Defined in 1795 by the French Academy of Sciences as the mass of one cubic centimetre of pure water at 4 °C — this made 1 mL of water weigh almost exactly 1 gram. The gram was the practical base of early metric calculations before the kilogram took over as SI base unit in 1875. The relationship 1 mL water ≈ 1 g is still a useful approximation in cooking and chemistry.
Interesting fact: A standard large paperclip weighs about 1 gram. The gram forms the basis for milligram (mg), microgram (μg), and tonne (10⁶ g) through SI prefixes.