What is 5/8 as a decimal?

5/8 is exactly 0.625 as a decimal.

How many millimetres is 5/8 of an inch?

5/8 of an inch is 15.875 mm, computed with the exact definition 1 inch = 25.4 mm.

5/8

Fraction5/8

Decimal0.625

Percent62.5%

5 of 8 equal parts filled — the same share as a bar and as a circle.

Where the decimal comes from

5/8 equals 625/1,000 equals 0.625.

Multiply the top and bottom by 125 and the denominator becomes 1,000. A fraction over 1,000 is what a decimal is: 0.625 means 625 thousandths.

Every way to write it

Decimal: 0.625
Percent: 62.5%
Ratio: 5 : 8 (part to whole)
As inches: 5/8″ = 15.875 mm

Equivalent fractions

Multiply the top and bottom of 5/8 by the same number and the value does not change:

5/8 = 10/16 = 15/24 = 20/32 = 25/40 = 30/48 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 5/8″ is 15.875 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	5/8″	0.625	15.875	exact
32ths	5/8″	0.625	15.875	exact
64ths	5/8″	0.625	15.875	exact

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

Common questions

What is 5/8 as a decimal?: 5/8 is exactly 0.625 as a decimal.
What is 5/8 as a percentage?: 5/8 is exactly 62.5%.
How many millimetres is 5/8 of an inch?: 5/8 of an inch is 15.875 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 5/8 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.

5/8