What is 1/100 as a decimal?

1/100 is exactly 0.01 as a decimal.

How many millimetres is 1/100 of an inch?

1/100 of an inch is 0.254 mm, computed with the exact definition 1 inch = 25.4 mm.

1/100

Fraction1/100

Decimal0.01

Percent1%

Where the decimal comes from

1/100 equals 0.01.

The denominator is already a power of ten, and that is what a decimal is: 0.01 means 1 hundredths.

1 of 100 squares — 0.01 of the whole. The same squares read as a percentage: 1%, because percent means per hundred.

Every way to write it

Decimal: 0.01
Percent: 1%
Ratio: 1 : 100 (part to whole)
As inches: 1/100″ = 0.254 mm

Equivalent fractions

Multiply the top and bottom of 1/100 by the same number and the value does not change:

1/100 = 2/200 = 3/300 = 4/400 = 5/500 = 6/600 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 1/100″ is 0.254 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	0″	0	0	−0.254 mm
32ths	0″	0	0	−0.254 mm
64ths	1/64″	0.015625	0.3969	+0.1429 mm

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

Common questions

What is 1/100 as a decimal?: 1/100 is exactly 0.01 as a decimal.
What is 1/100 as a percentage?: 1/100 is exactly 1%.
How many millimetres is 1/100 of an inch?: 1/100 of an inch is 0.254 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 1/100 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.