120 millimeters to centimeters
12.00 cm
120 mm = 12.00 cm.
centimeters
12.00cm
120 mm = 12.00 cm
In short
How many centimeters is 120 millimeters?
120 mm = 12.00 cm. 1 millimeter = 0.100000 centimeters, so the working is 120 × 0.100000 = 12.00.
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 = 0.100000 centimeters 120 × 0.100000 = 12.00
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 (cm) | Off by |
|---|---|---|
| Whole number | 12 | exact |
| 1 decimal | 12.0 | exact |
| 2 decimals | 12.00 | exact |
Round trip: take 12.00 cm back the other way and you land on 120.0000 mm — a drift of 0.0000 mm. That gap is the rounding, not the conversion.
Frequently asked questions
What is 120 millimeters in centimeters?
120 millimeters is 12.00 centimeters. 1 millimeter = 0.100000 centimeters, so the working is 120 × 0.100000 = 12.00.
How accurate is 12.00 cm?
Rounding to 12.00 cm and converting straight back gives 120.0000 mm, a drift of 0.0000 mm from the 120 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
Millimeters to Centimeters Converter
Convert mm to cm — ten to one, the shortest step on the metric ladder.
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