๐ Automotive
Engine RPM Calculator
Engine speed at a given road speed depends on the tire diameter and the combined gear and final-drive ratios. Taller tires or taller gears lower the rpm for the same speed, which usually improves fuel economy but reduces acceleration.
How it works
Road speed
Gear ratio
Final drive ratio
Tire width
Aspect ratio
Wheel diameter
Tire diameter
Tire circumference
Engine speed
Speed at 2,000 rpm in this gear
Frequently asked questions
How do I use the Engine RPM Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.