Decimal inches to ruler fractions for model makers
Round an exact decimal measurement to the nearest mark your workshop ruler can show.
Rounded inches = round(Decimal inches × Denominator) ÷ Denominator
How it works
Use 16, 32, or 64 to match your ruler.
Checked example
At 1.99 inches on a 1/16 ruler, the practical mark is 2 inches.
Workshop notes
The difference is +0.254 mm; keep exact and rounded values together.