Where is 1.7 mm on a ruler?
Quick Answer
1.7 mm on a ruler is between the 1 mm and 2 mm lines.
The red marker shows 0.17 cm position on a metric ruler. This is 1.7 millimeters (1 cm = 10 mm).
Millimeters on a Ruler
How to read mm on a ruler
A metric ruler divides every centimeter into 10 equal millimeters. The longest lines mark each whole centimeter (cm); the single medium-length line in the middle of each centimeter is the 5 mm (half-centimeter) mark; the eight shortest lines are the remaining 1 mm steps. So 10 mm = 1 cm.
- Whole centimeters — the tallest, numbered lines (1, 2, 3 … cm).
- 5 mm mark — the one taller line halfway between two cm lines (e.g. 25 mm = 2.5 cm).
- 1 mm steps — the short lines; count them up from the last cm line.
- Reading a value — for 85 mm, find 8 cm then count 5 more mm: it lands on the 8.5 cm (half) mark.
To read any millimeter value, divide by 10 to get the centimeter line, then count the leftover millimeters past it: 85 mm → 8 cm + 5 mm. A decimal like 1.5 mm falls between two millimeter lines, just past the 1 mm step.
Popular mm on a ruler
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