What is 13/16 as a decimal?

13/16 is exactly 0.8125 as a decimal.

How many millimetres is 13/16 of an inch?

13/16 of an inch is 20.6375 mm, computed with the exact definition 1 inch = 25.4 mm.

13/16

Fraction13/16

Decimal0.8125

Percent81.25%

13 of 16 equal parts filled — the same share as a bar and as a circle.

Where the decimal comes from

13/16 equals 8125/10,000 equals 0.8125.

Multiply the top and bottom by 625 and the denominator becomes 10,000. A fraction over 10,000 is what a decimal is: 0.8125 means 8125 thousandths.

Every way to write it

Decimal: 0.8125
Percent: 81.25%
Ratio: 13 : 16 (part to whole)
As inches: 13/16″ = 20.6375 mm

Equivalent fractions

Multiply the top and bottom of 13/16 by the same number and the value does not change:

13/16 = 26/32 = 39/48 = 52/64 = 65/80 = 78/96 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 13/16″ is 20.6375 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	13/16″	0.8125	20.6375	exact
32ths	13/16″	0.8125	20.6375	exact
64ths	13/16″	0.8125	20.6375	exact

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

Common questions

What is 13/16 as a decimal?: 13/16 is exactly 0.8125 as a decimal.
What is 13/16 as a percentage?: 13/16 is exactly 81.25%.
How many millimetres is 13/16 of an inch?: 13/16 of an inch is 20.6375 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 13/16 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.