20 millimeters to inches
0.79 in
20 mm = 0.79 in.
inches
0.79in
20 mm = 0.79 in
In short
How many inches is 20 millimeters?
20 mm = 0.79 in. 1 millimeter = 0.039370 inches, so the working is 20 × 0.039370 = 0.79.
The working
The factor below is an exact definition rather than a measurement, so nothing is approximated in the arithmetic. The only rounding on this page happens where a number is displayed.
1 millimeter = 0.039370 inches 20 × 0.039370 = 0.79
How much precision do you need?
Each row is the same answer cut at a different number of decimals, with what that choice costs you. Pick the shortest row whose error is smaller than whatever you are measuring with.
| Rounded to | Answer (in) | Off by |
|---|---|---|
| Whole number | 1 | +0.21260 |
| 1 decimal | 0.8 | +0.01260 |
| 2 decimals | 0.79 | +0.00260 |
Round trip: take 0.79 in back the other way and you land on 20.0660 mm — a drift of 0.0660 mm. That gap is the rounding, not the conversion.
Frequently asked questions
What is 20 millimeters in inches?
20 millimeters is 0.79 inches. 1 millimeter = 0.039370 inches, so the working is 20 × 0.039370 = 0.79.
How accurate is 0.79 in?
Rounding to 0.79 in and converting straight back gives 20.0660 mm, a drift of 0.0660 mm from the 20 you started with. The factor itself is exact; every bit of that difference comes from the rounding, not the conversion.
Nearby values
Any value at all
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