Automotive Calculators
Engine RPM Calculator
Calculate your engine's RPM at any speed using gear ratio, final drive, and tire size. Also find your top speed at redline.
FreeGear RatioTire SizeNo sign-up
Speed & Gear
mph
:1
:1
RPM
Tire Size
Engine RPM
591,843
at 60 mph in this gear
Tire Diameter
26.3"
outer diameter
Speed at Redline
0.7 mph
at 6,500 RPM
Use this calculator to find the ideal gear ratios for your build or verify that an engine swap is compatible with your drivetrain.
RPM Formula
RPM = (Speed (mph) × Total Ratio × 5280 × 12) / (Tire Circumference (in) × 60)
Where Total Ratio = Gear Ratio × Final Drive Ratio, and Tire Circumference = π × Tire Diameter.
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