The following are a quick reference for converting inches in fractions, decimals or metric format and metric/US unit conversions for volume, energy, flow, etc.
| Decimal to fraction conversion chart | ||
| Fraction (Inches) | Decimal (Inches) | Metric (mm) |
| 7/32″ | 0.219 | 6 |
| 1/4″ | 0.250 | 6 |
| 5/16″ | 0.313 | 8 |
| 3/8″ | 0.375 | 10 |
| 1/2″ | 0.500 | 13 |
| 5/8″ | 0.625 | 16 |
| To Convert: | Into: | Multiply by: | |
| Volume | Cubic Foot ft³ | Cubic Meter m³: | 0.028 |
| Cubic Meter m³ | Cubic Foot ft³ | 35.310 | |
| Energy | Horsepower hp (electric) | Watt W | 746.000 |
| Watt W | Horsepower hp (electric) | 0.001 | |
| Flow | Cubic foot/minute CFM | Cubic meter/hour m³/h | 0.589 |
| Cubic meter/hour m³/h | Cubic foot/minute CFM | 1.699 | |
| Length | Millimeter mm | Inch in | 0.039 |
| Inch in | Millimeter mm | 25.400 | |
| Pressure | Pascal (N/m³) Pa | Pounds/sq inch psi | 0.000145 |
| Pounds/sq inch psi | Pascal (N/m³) Pa | 6894.757 | |
| Inch of Water (at 4° C) in w.g. | Atmospheres atm | 0.002 | |
| Atmospheres atm | Inch of Water (at 4° C) in w.g. | 406.800 | |
| Inch of Water (at 4° C) in w.g. | Millimeters of water mm H2O | 0.039 | |
| Millimeters of water mm H2O | Inch of Water (at 4° C) in w.g. | 25.400 | |
| Temperature | Celsius °C | Fahrenheit °F | 33.800 |
| Fahrenheit °F | Celsius °C | -17.222 | |
| Weight | US Pound lb | Kilogram kg | 0.454 |
| Kilogram kg | US Pound lb | 2.205 |