Conversion factors
As you may have noticed some measurements we quote on these pages are in US Customary Units and others are in Metric Units. It depends on what’s our experience is, which measurement is used most often. But to ensure we all can measure, here is a table with the ones you need for tuning your engine:
| If you have |
And you need |
Multiply by |
If you have |
And you need |
Multiply by |
| Inches |
Centimeters |
2,540 |
Centimeters |
Inches |
0,394 |
| Feet |
Meters |
0,304 |
Meters |
Feet |
3,289 |
| Miles |
Kilometers |
1,609 |
Kilometers |
Miles |
0,622 |
| MPH |
KPH |
1,609 |
KPH |
MPH |
0,622 |
| Knots |
MPH |
1,852 |
MPH |
Knots |
0,540 |
| Pints |
Liters |
0,473 |
Liters |
Pints |
2,114 |
| Quarts |
Liters |
0,946 |
Liters |
Quarts |
1,057 |
| Gallons |
Liters |
3,785 |
Liters |
Gallons |
0,264 |
| Cubic Inches |
Liters |
0,016 |
Liters |
Cubic Inches |
62,500 |
| Ounces |
Grams |
28,350 |
Grams |
Ounces |
0,035 |
| Pounds |
Kilograms |
0,454 |
Kilograms |
Pounds |
2,205 |
| Ft/lbs |
Newton-mtr |
1,360 |
Newton-mtr |
Ft/lbs |
0,735 |
| Psi |
Atmospheres |
0,680 |
Atmospheres |
Psi |
1,471 |
| Psi |
Kilopascals |
6,890 |
Kilopascals |
Psi |
0,145 |
| HP (DIN) |
HP (SAE) |
1,104 |
HP (SAE) |
HP (DIN) |
0,906 |
| HP (SAE) |
Kilowatts |
0,746 |
Kilowatts |
HP (SAE) |
1,340 |
| MPG |
Km/l |
0,425 |
Km/l |
MPG |
2,353 |