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The grain is the imperial unit of mass which is used as the basis of all three of the imperial weight systems.

Conversion Factors

\(\ds \) \(\) \(\ds 1\) grain
\(\ds \) \(=\) \(\ds \dfrac 1 {437 \cdot 5}\) ounce avoirdupois
\(\ds \) \(\approx\) \(\ds 64 \cdotp 8\) milligrams

Linguistic Note

The word grain derives directly from the mass of a grain of wheat.