Length converter
Centimeters to inches.
Read the decimal answer, find its nearest inch-ruler mark, and keep the rounding difference visible.
The marker shows the fractional part of one inch. This diagram illustrates tick positions; it is not a physical-size ruler.
Conversion formula
inches = centimeters ÷ 2.54
Enter the source length above. The result updates immediately. These calculations use exact length definitions: 1 m = 100 cm = 1000 mm, 1 in = 25.4 mm, and 1 ft = 12 in. Only the displayed answer and fractional ruler mark are rounded. The feet-and-inches output splits a length into whole feet and remaining inches; decimal feet do not encode an inch count.
Worked example
10 cm equals 3.937008 inches. Rounded to the nearest sixteenth, that is 3 15/16 inches. That mark represents 10.00125 cm, just 0.0125 mm longer. A convenient fraction can be very close without being mathematically identical.
Conversion table: cm → in
Select a source value to load it into the calculator. Decimal results are displayed to at most six places; inch fractions in this table are rounded to 1/16 inch.
| Centimeters (cm) | Inches (in) | Nearest inch fraction |
|---|---|---|
| 0.393701 | ≈ 3/8 in | |
| 0.787402 | ≈ 13/16 in | |
| 1 | ≈ 1 in | |
| 1.968504 | ≈ 1 15/16 in | |
| 2.755906 | ≈ 2 3/4 in | |
| 3.937008 | ≈ 3 15/16 in | |
| 4.724409 | ≈ 4 3/4 in | |
| 5.905512 | ≈ 5 7/8 in | |
| 7.874016 | ≈ 7 7/8 in | |
| 9.84252 | ≈ 9 13/16 in | |
| 11.811024 | ≈ 11 13/16 in | |
| 19.685039 | ≈ 19 11/16 in |
When to use this conversion
Use this for fabric pieces, picture dimensions, small craft projects, and measurements written in centimeters when your ruler is marked in inches. Enter the full decimal value from your source before rounding.
If you need to check the physical length, open the screen ruler and calibrate it. This numerical converter works without screen calibration; a displayed physical scale does not.
Exact conversion versus a ruler reading
The unit relationship is exact, but a measured object may have uncertainty. At 1/16 inch, the maximum rounding difference is half a tick: 1/32 inch, or 0.79375 mm. The calculator shows the actual rounding difference for your value. Use a finer division only if the source measurement and physical instrument support that precision.
Next steps
Numerical conversion needs no display calibration. Comparing a physical object against your screen does. Use the ruler for small objects, a verified paper ruler away from your display, or an appropriate calibrated instrument for safety-critical measurements.
Related converters
Reference: NIST unit conversion factors. Calculations use the international foot, not historical survey-foot units. Fractions are explicitly approximate. NIST ↗