What is 17/20 as a decimal?

17/20 is exactly 0.85 as a decimal.

How many millimetres is 17/20 of an inch?

17/20 of an inch is 21.59 mm, computed with the exact definition 1 inch = 25.4 mm.

17/20

Fraction17/20

Decimal0.85

Percent85%

17 of 20 equal parts filled .

Where the decimal comes from

17/20 equals 85/100 equals 0.85.

Multiply the top and bottom by 5 and the denominator becomes 100. A fraction over 100 is what a decimal is: 0.85 means 85 hundredths.

85 of 100 squares — 0.85 of the whole. The same squares read as a percentage: 85%, because percent means per hundred.

Every way to write it

Decimal: 0.85
Percent: 85%
Ratio: 17 : 20 (part to whole)
As inches: 17/20″ = 21.59 mm

Equivalent fractions

Multiply the top and bottom of 17/20 by the same number and the value does not change:

17/20 = 34/40 = 51/60 = 68/80 = 85/100 = 102/120 · more, or pick a denominator

On the number line

As a measurement

Read as inches, 17/20″ is 21.59 mm exactly. The nearest marks on the finer rules:

Rule	Nearest mark	Decimal inches	mm	Difference
16ths	7/8″	0.875	22.225	+0.635 mm
32ths	27/32″	0.84375	21.4313	−0.1588 mm
64ths	27/32″	0.84375	21.4313	−0.1588 mm

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

Common questions

What is 17/20 as a decimal?: 17/20 is exactly 0.85 as a decimal.
What is 17/20 as a percentage?: 17/20 is exactly 85%.
How many millimetres is 17/20 of an inch?: 17/20 of an inch is 21.59 mm, computed with the exact definition 1 inch = 25.4 mm.

0.85 as a fractionThe same number from the decimal's side, with the reduction shown.85% 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 17/20 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.