Formulas & exact factors
- Definition: 1 pound (avoirdupois) =
7000 grand exactly453.59237 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.
Formula (LaTeX) + variables + units
This section shows the formulas used by the calculator engine, plus variable definitions and units.
Formula (extracted LaTeX)
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Formula (extracted text)
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.
Variables and units
- No variables provided in audit spec.
Sources (authoritative):
- NIST — Weights and measures — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/weights-and-measures - NIST — SI units — nist.gov · Accessed 2026-01-19
https://www.nist.gov/pml/owm/metric-si/si-units
Changelog
Version: 0.1.0-draft
Last code update: 2026-01-19
Last code update: 2026-01-19
0.1.0-draft · 2026-01-19
- Initial audit spec draft generated from HTML extraction (review required).
- Verify formulas match the calculator engine and convert any text-only formulas to LaTeX.
- Confirm sources are authoritative and relevant to the calculator methodology.