Grains (gr) ⇄ Grams (g) Converter

Convert grains to grams and grams to grains with exact factors. Includes milligrams, rounding, presets, quick tables, and formulas.

Exact: 1 gr = 0.06479891 g 1 g ≈ 15.43235835 gr

Grains → grams

Grams (g)
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Milligrams (mg)
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Grams → grains

Grains (gr)
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Quick table

Grains (gr) Grams (g) Milligrams (mg)

Formulas & exact factors

  • Definition: 1 pound (avoirdupois) = 7000 gr and exactly 453.59237 g.
  • Therefore: 1 gr = 453.59237 / 7000 g = 0.06479891 g (exact).
  • Reciprocal: 1 g = 1 / 0.06479891 gr ≈ 15.4323583529 gr.
  • Milligrams: 1 gr = 64.79891 mg (exact).

Convert grains → grams: g = gr × 0.06479891.

Convert grams → grains: gr = g ÷ 0.06479891.

Examples

55 gr → g = 55 × 0.06479891 = 3.56394005 g.

1 g → gr ≈ 1 ÷ 0.06479891 ≈ 15.43235835 gr.

Notes & safety

  • Grains are common in ballistics (bullet/powder mass) and some pharma contexts. Always confirm unit labels.
  • This tool preserves exact factors; use the rounding menu only for display.