What is 5/64 as a decimal?

5/64 is exactly 0.078125 as a decimal.

How many millimetres is 5/64 of an inch?

5/64 of an inch is 1.984375 mm, computed with the exact definition 1 inch = 25.4 mm.

5/64

Fraction5/64

Decimal0.078125

Percent7.8125%

5 of 64 equal parts filled .

Where the decimal comes from

5/64 equals 78125/1,000,000 equals 0.078125.

Multiply the top and bottom by 15625 and the denominator becomes 1,000,000. A fraction over 1,000,000 is what a decimal is: 0.078125 means 78125 thousandths.

Every way to write it

Decimal: 0.078125
Percent: 7.8125%
Ratio: 5 : 64 (part to whole)
As inches: 5/64″ = 1.984375 mm

Equivalent fractions

Multiply the top and bottom of 5/64 by the same number and the value does not change:

5/64 = 10/128 = 15/192 = 20/256 = 25/320 = 30/384 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 5/64″ is 1.984375 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	1/16″	0.0625	1.5875	−0.3969 mm
32ths	3/32″	0.09375	2.3813	+0.3969 mm
64ths	5/64″	0.078125	1.9844	exact

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

Common questions

What is 5/64 as a decimal?: 5/64 is exactly 0.078125 as a decimal.
What is 5/64 as a percentage?: 5/64 is exactly 7.8125%.
How many millimetres is 5/64 of an inch?: 5/64 of an inch is 1.984375 mm, computed with the exact definition 1 inch = 25.4 mm.

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