Converters

Six ways between the same notations, all exact. Or type anything below and be taken to the right one.

Fraction → decimal 3/8 = 0.375, with repeating decimals identified. Fraction → percent 3/8 = 37.5%, exactly. Decimal → fraction 0.375 = 3/8, in lowest terms. Percent → fraction 37.5% = 3/8, reduced over 100. Repeating decimal → fraction 0.(3) = 1/3, exact by construction. Fractional inches → mm 3/8″ = 9.525 mm, at exactly 25.4 mm per inch.

Where this comes from. Exact rational arithmetic on the values shown — fractions are pairs of integers until display, and inch–metric conversion uses 25.4 mm to the inch, exact by definition since 1959. See the full methodology.