What is 3/20 as a decimal?

3/20 is exactly 0.15 as a decimal.

How many millimetres is 3/20 of an inch?

3/20 of an inch is 3.81 mm, computed with the exact definition 1 inch = 25.4 mm.

3/20

Fraction3/20

Decimal0.15

Percent15%

3 of 20 equal parts filled .

Where the decimal comes from

3/20 equals 15/100 equals 0.15.

Multiply the top and bottom by 5 and the denominator becomes 100. A fraction over 100 is what a decimal is: 0.15 means 15 hundredths.

15 of 100 squares — 0.15 of the whole. The same squares read as a percentage: 15%, because percent means per hundred.

Every way to write it

Decimal: 0.15
Percent: 15%
Ratio: 3 : 20 (part to whole)
As inches: 3/20″ = 3.81 mm

Equivalent fractions

Multiply the top and bottom of 3/20 by the same number and the value does not change:

3/20 = 6/40 = 9/60 = 12/80 = 15/100 = 18/120 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 3/20″ is 3.81 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	1/8″	0.125	3.175	−0.635 mm
32ths	5/32″	0.15625	3.9688	+0.1588 mm
64ths	5/32″	0.15625	3.9688	+0.1588 mm

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

Common questions

What is 3/20 as a decimal?: 3/20 is exactly 0.15 as a decimal.
What is 3/20 as a percentage?: 3/20 is exactly 15%.
How many millimetres is 3/20 of an inch?: 3/20 of an inch is 3.81 mm, computed with the exact definition 1 inch = 25.4 mm.

Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 3/20 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.