Centimeters to Inches Converter
Common Conversions
| cm | in |
|---|---|
| 0.5 | 0.197 |
| 1 | 0.394 |
| 2 | 0.787 |
| 2.54 | 1 |
| 5 | 1.969 |
| 10 | 3.937 |
| 15 | 5.906 |
| 20 | 7.874 |
| 25 | 9.843 |
| 30 | 11.811 |
| 50 | 19.685 |
Why this conversion matters in chemistry
A standard 1 cm spectroscopy cuvette path length works out to 0.394 inches on a machine-shop drawing; a 15 cm Buchner funnel is 5.9 inches; a 30 cm bench section is just under a foot. The bridge is dividing by 2.54, the exact 2.54 cm per inch factor pinned by international agreement. Most of chemistry happens in metric — glassware, bench measurements, pipetted volumes — so the direction that matters in practice is when a metric specimen has to be described for a US-built fabrication or a compression fitting sized in imperial units. Once the number is in inches, the downstream calculation usually stays imperial until the result loops back to chemistry.
Formula
Worked Examples
The defining anchor. Exact by international agreement.
A standard UV-Vis spectroscopy cuvette path length. Worth keeping in mind when absorbance units don't quite line up with published molar extinction coefficients.
A typical Buchner funnel diameter. Close enough to 6 inches that the US-imperial and metric versions of the same glassware are often interchangeable.
Roughly one foot, though not exactly — the foot is precisely 30.48 cm. Useful for sanity-checking a bench layout without pulling out a ruler.