Muzzle Loader's Interactive Gun Bore to Gauge Calculator for Flintlock and Percussion arms enter barrel diameter in inches or millimeters for instant conversion and results

The Battle of Waterloo by William Sadler (c.1782 – 1839)

These calculations for flintlock and percussion arms are based on the ball diameter being equal to that of the bore. The result is the gauge which is the number of spheres of this diameter required make up a 1lb weight. A patched ball will be a little smaller and weigh less than the above figures suggest. The gauge however, remains as calculated.