Fraction · Decimal · Millimetre is an interactive workshop converter that translates between fractions, decimal inches, and millimetres — built around a live rule graduated to 1/64″ that you can type into, step, or drag.

What it does

Anyone who works to a drawing has hit the mid-job math: the plan calls for millimetres, the tape reads sixteenths, and the caliper shows a decimal. This tool keeps all three in sync on a single graduated rule. Type any value, step the blade with the − / + buttons, or drag it directly — off-grid measurements snap to the nearest sixty-fourth and tell you exactly how far off you were in inches, millimetres, and thou.

What you get

Three units, always in sync

Enter a fraction, a decimal inch, or a millimetre value and see the other two update instantly.

A live 1/64″ rule

Step the blade with the − / + buttons or drag it to feel the measurement, not just read it.

Honest snapping

Off-grid values snap to the nearest sixty-fourth and report how far off you are in inches, mm, and thou.

Workshop-accurate math

1 inch = 25.4 mm exactly, with values rounded half-up to match a standard quick-reference sheet.

Who it's for

Anyone who moves between imperial and metric at the bench and wants the conversion to be visual and unambiguous:

Machinists & fabricators reconciling drawings, calipers, and tape measures on the fly.
Woodworkers & makers who think in fractions but buy stock in millimetres.
Students & hobbyists building an intuition for how sixty-fourths, decimals, and mm line up.

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