0.421875 as a fraction

Fraction27/64lowest terms
Decimal0.421875
Percent42.1875%

How to get there

  1. 0.421875 has 6 digits after the point, so it is that many ten-to-the-6 parts: write the digits over 1,000,000421,875/1,000,000.
  2. 421,875 and 1,000,000 share a greatest common divisor of 15,625. Divide both by it: 27/64.

27 of 64 equal parts filled.

As a measurement

Read as inches, 0.421875″ is 10.715625 mm exactly. The nearest marks on a rule:

RuleNearest markInchesmmDifference
16ths7/16″0.437511.1125+0.3969 mm
32ths7/16″0.437511.1125+0.3969 mm
64ths27/64″0.42187510.7156exact

Common questions

What is 0.421875 as a fraction?
0.421875 as a fraction is 27/64. Write the digits over 1,000,000 to get 421,875/1,000,000, then divide top and bottom by 15,625.
What is 0.421875 as a percentage?
0.421875 is 42.1875%. Multiplying a decimal by 100 moves the point two places to the right.
How many millimetres is 0.421875 of an inch?
0.421875 inches is 10.715625 mm, using the exact definition 1 inch = 25.4 mm.

The same number, other ways

27/64Everything about the fraction: equivalents, the bar model, the number line.42.1875%The same value as a percentage, with its own derivation.Decimal → fraction chartThe whole lookup table, printable.Nearest fractionMatch 0.421875″ against any rule, with the exact error.
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.