What is 0.25 as a fraction?

0.25 as a fraction is 1/4. Write the digits over 100 to get 25/100, then divide top and bottom by 25.

What is 0.25 as a percentage?

0.25 is 25%. Multiplying a decimal by 100 moves the point two places to the right.

How many millimetres is 0.25 of an inch?

0.25 inches is 6.35 mm, using the exact definition 1 inch = 25.4 mm.

0.25 as a fraction

Fraction1/4lowest terms

Decimal0.25

Percent25%

How to get there

0.25 has 2 digits after the point, so it is that many hundredths: write the digits over 100 — 25/100.
25 and 100 share a greatest common divisor of 25. Divide both by it: 1/4.

25 of 100 squares — 0.25 of the whole, which is also 25%.

As a measurement

Read as inches, 0.25″ is 6.35 mm exactly. The nearest marks on a rule:

Rule	Nearest mark	Inches	mm	Difference
16ths	1/4″	0.25	6.35	exact
32ths	1/4″	0.25	6.35	exact
64ths	1/4″	0.25	6.35	exact

Common questions

What is 0.25 as a fraction?: 0.25 as a fraction is 1/4. Write the digits over 100 to get 25/100, then divide top and bottom by 25.
What is 0.25 as a percentage?: 0.25 is 25%. Multiplying a decimal by 100 moves the point two places to the right.
How many millimetres is 0.25 of an inch?: 0.25 inches is 6.35 mm, using the exact definition 1 inch = 25.4 mm.

The same number, other ways

1/4Everything about the fraction: equivalents, the bar model, the number line.25%The same value as a percentage, with its own derivation.Decimal → fraction chartThe whole lookup table, printable.Nearest fractionMatch 0.25″ 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.