What is 1/25 as a decimal?

1/25 is exactly 0.04 as a decimal.

How many millimetres is 1/25 of an inch?

1/25 of an inch is 1.016 mm, computed with the exact definition 1 inch = 25.4 mm.

1/25

Fraction1/25

Decimal0.04

Percent4%

1 of 25 equal parts filled .

Where the decimal comes from

1/25 equals 4/100 equals 0.04.

Multiply the top and bottom by 4 and the denominator becomes 100. A fraction over 100 is what a decimal is: 0.04 means 4 hundredths.

4 of 100 squares — 0.04 of the whole. The same squares read as a percentage: 4%, because percent means per hundred.

Every way to write it

Decimal: 0.04
Percent: 4%
Ratio: 1 : 25 (part to whole)
As inches: 1/25″ = 1.016 mm

Equivalent fractions

Multiply the top and bottom of 1/25 by the same number and the value does not change:

1/25 = 2/50 = 3/75 = 4/100 = 5/125 = 6/150 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 1/25″ is 1.016 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	1/16″	0.0625	1.5875	+0.5715 mm
32ths	1/32″	0.03125	0.7938	−0.2223 mm
64ths	3/64″	0.046875	1.1906	+0.1746 mm

Need a different rule or a tolerance? Nearest fraction · Within tolerance

Common questions

What is 1/25 as a decimal?: 1/25 is exactly 0.04 as a decimal.
What is 1/25 as a percentage?: 1/25 is exactly 4%.
How many millimetres is 1/25 of an inch?: 1/25 of an inch is 1.016 mm, computed with the exact definition 1 inch = 25.4 mm.

0.04 as a fractionThe same number from the decimal's side, with the reduction shown.4% as a fractionThe same number as a percentage, with the work shown.Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 1/25 in its place.

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.