Ford Mustang GT RPM to MPH at Redline

Estimate the top speed in 6th gear at redline (7,000 RPM) for a Mustang GT with stock 255/40R19 tires and a 3.15 rear axle.

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How to use this tool

Enter the engine RPM you want to evaluate.
Enter the overall tire diameter in inches.
Enter the transmission gear ratio for the selected gear and the axle ratio.
The calculator returns vehicle speed in MPH.

Calculate the theoretical top speed of a Ford Mustang GT at redline in 6th gear using stock tire and axle specs.

Frequently asked questions

How do you calculate vehicle speed from RPM?: Speed (MPH) = RPM × tire circumference (in) ÷ (gear ratio × axle ratio × 1,056). The constant 1,056 converts inches/minute to MPH (63,360 in/mile ÷ 60 min/hr).
Why does gear ratio matter for speed?: A lower (numerically higher) gear ratio like 3.73 gives more torque but less top speed than a ratio like 2.73 at the same RPM.