When converting inches to millimetres, 8 millimetres (mm) equals 0.3150 inches. A millimetre is the same as 0.0394 inch.
To convert 8mm to inches, multiply 8 by 0.0394 inches, which becomes 0.3150 inches. By knowing that one inch equals 25.40 millimetres and multiplying the number of inches by that value, one can convert from inches to millimetres using conversion tables or factors.
When converting from the metric to the imperial system, conversion tables and charts come in handy, especially in math. The Imperial system was developed by the English several centuries ago, while the metric system was developed by the French in 1670.
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