What is 7/8 as a decimal?

7/8 is exactly 0.875 as a decimal.

How many millimetres is 7/8 of an inch?

7/8 of an inch is 22.225 mm, computed with the exact definition 1 inch = 25.4 mm.

7/8

Fraction7/8

Decimal0.875

Percent87.5%

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

Where the decimal comes from

7/8 equals 875/1,000 equals 0.875.

Multiply the top and bottom by 125 and the denominator becomes 1,000. A fraction over 1,000 is what a decimal is: 0.875 means 875 thousandths.

Every way to write it

Decimal: 0.875
Percent: 87.5%
Ratio: 7 : 8 (part to whole)
As inches: 7/8″ = 22.225 mm

Equivalent fractions

Multiply the top and bottom of 7/8 by the same number and the value does not change:

7/8 = 14/16 = 21/24 = 28/32 = 35/40 = 42/48 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 7/8″ is 22.225 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	7/8″	0.875	22.225	exact
32ths	7/8″	0.875	22.225	exact
64ths	7/8″	0.875	22.225	exact

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

Common questions

What is 7/8 as a decimal?: 7/8 is exactly 0.875 as a decimal.
What is 7/8 as a percentage?: 7/8 is exactly 87.5%.
How many millimetres is 7/8 of an inch?: 7/8 of an inch is 22.225 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 7/8 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.

7/8