What is 9/20 as a decimal?

9/20 is exactly 0.45 as a decimal.

How many millimetres is 9/20 of an inch?

9/20 of an inch is 11.43 mm, computed with the exact definition 1 inch = 25.4 mm.

9/20

Fraction9/20

Decimal0.45

Percent45%

9 of 20 equal parts filled .

Where the decimal comes from

9/20 equals 45/100 equals 0.45.

Multiply the top and bottom by 5 and the denominator becomes 100. A fraction over 100 is what a decimal is: 0.45 means 45 hundredths.

45 of 100 squares — 0.45 of the whole. The same squares read as a percentage: 45%, because percent means per hundred.

Every way to write it

Decimal: 0.45
Percent: 45%
Ratio: 9 : 20 (part to whole)
As inches: 9/20″ = 11.43 mm

Equivalent fractions

Multiply the top and bottom of 9/20 by the same number and the value does not change:

9/20 = 18/40 = 27/60 = 36/80 = 45/100 = 54/120 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 9/20″ is 11.43 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	7/16″	0.4375	11.1125	−0.3175 mm
32ths	7/16″	0.4375	11.1125	−0.3175 mm
64ths	29/64″	0.453125	11.5094	+0.0794 mm

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

Common questions

What is 9/20 as a decimal?: 9/20 is exactly 0.45 as a decimal.
What is 9/20 as a percentage?: 9/20 is exactly 45%.
How many millimetres is 9/20 of an inch?: 9/20 of an inch is 11.43 mm, computed with the exact definition 1 inch = 25.4 mm.

0.45 as a fractionThe same number from the decimal's side, with the reduction shown.45% as a fractionThe same number as a percentage, with the work shown.Fraction–decimal chartThe everyday set, printable.Rule charts16ths, 32nds, 64ths, 128ths.The rulerSee 9/20 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.