What is 3/4 as a decimal?

3/4 is exactly 0.75 as a decimal.

How many millimetres is 3/4 of an inch?

3/4 of an inch is 19.05 mm, computed with the exact definition 1 inch = 25.4 mm.

3/4

Fraction3/4

Decimal0.75

Percent75%

3 of 4 equal parts filled — the same share as a bar and as a circle.

Where the decimal comes from

3/4 equals 75/100 equals 0.75.

Multiply the top and bottom by 25 and the denominator becomes 100. A fraction over 100 is what a decimal is: 0.75 means 75 hundredths.

75 of 100 squares — 0.75 of the whole. The same squares read as a percentage: 75%, because percent means per hundred.

Every way to write it

Decimal: 0.75
Percent: 75%
Ratio: 3 : 4 (part to whole)
As inches: 3/4″ = 19.05 mm

Equivalent fractions

Multiply the top and bottom of 3/4 by the same number and the value does not change:

3/4 = 6/8 = 9/12 = 12/16 = 15/20 = 18/24 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 3/4″ is 19.05 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	3/4″	0.75	19.05	exact
32ths	3/4″	0.75	19.05	exact
64ths	3/4″	0.75	19.05	exact

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

Common questions

What is 3/4 as a decimal?: 3/4 is exactly 0.75 as a decimal.
What is 3/4 as a percentage?: 3/4 is exactly 75%.
How many millimetres is 3/4 of an inch?: 3/4 of an inch is 19.05 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 3/4 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.

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