Convert inches (in) to millimetres (mm).
Edit either value. Decimals and scientific notation supported.
Whole feet; inches from 0 to less than 12. Non-negative values.
No units found. Try a name or symbol.
Feet + inches
Whole feet; inches from 0 to less than 12. Non-negative values.
No units found. Try a name or symbol.
Feet + inches
1 in ≈ 25.4 mm
Precision changes displayed rounding, not calculation accuracy.
mm = in × 25.4mm = in × 25.4
Multiply the in reading by 25.4.
0.5 in ≈ 12.7 mm
0.5 × 25.4 ≈ 12.7
12 in ≈ 304.8 mm
12 × 25.4 ≈ 304.8
A decimal inch is a fraction of one inch: 0.5 is 1/2 inch and 0.25 is 1/4 inch. This tool keeps decimal results rather than rounding them automatically to ruler marks.
Fixed reference · Inch to Millimetre
Reference values use this page’s named pair and default context. Calculator precision and font settings do not change this table.
| Inch (in) | Millimetre (mm) |
|---|---|
| 0 | 0 |
| 0.1 | 2.54 |
| 0.5 | 12.7 |
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 127 |
| 10 | 254 |
| 25 | 635 |
| 50 | 1270 |
| 100 | 2540 |
| 1000 | 25400 |
m · km · cm and more
kg · g · mg and more
m² · km² · cm² and more
L · mL · m³ and more
°C · °F · K and more
m/s · km/h · mph and more
Pa · kPa · MPa and more
J · kJ · MJ and more
W · kW · MW and more
B · b · kB and more
px · pt · pc and more
s · ms · µs and more
° · rad · gon and more
Hz · kHz · MHz and more
N · kN · lbf and more
bit/s · kbit/s · Mbit/s and more
L/100 km · km/L · mpg (US) and more
kg/m³ · g/cm³ · g/L and more
No matching category. Try “length”, “pounds”, “GB” or “temperature”.