Speed Sensor Pulses Calculator
Find how many pulses the sensor sends per mile. Use the calculator below. Results update as you type.
How the Speed Sensor Pulses Calculator Works
This calculator works by multiplying tire revolutions per mile by the number of sensor pulses per wheel revolution. The result is pulses per mile (or per km) that a speedometer or controller receives.
- Enter the tire size, for example 265/70R17 (638.1 revs/mi).
- Enter the pulses per wheel revolution, for example 48.
- Read the pulses per mile: 30,629.
- Read the pulse rate at 60 mph: 510.5 pulses per second (Hz).
The Formula
The formula is Pulses per Mile = Revs per Mile × Pulses per Revolution.
Pulses per Mile = Revs per Mile × PPR Pulses per km = Revs per km × PPR Pulse Rate (Hz) = Pulses per Mile × Speed (mph) ÷ 3,600PPR is pulses per revolution: the number of teeth on the tone ring, or the drive-ratio-adjusted count for a transmission sensor. Worked example: 638.1 × 16 = 10,210 pulses per mile.
Conversion Table
The conversion table shows pulses per mile, per km and per second at 60 mph for 8 pulse counts on a 265/70R17. Counts run from 4 to 96 pulses per revolution.
Many ABS tone rings have 40 to 50 teeth. The 48-tooth row gives 30,629 pulses per mile.
| Pulses / Wheel Rev | Pulses / Mile | Pulses / km | Pulses / s at 60 mph |
|---|---|---|---|
| 4 | 2,552 | 1,586 | 42.5 |
| 8 | 5,105 | 3,172 | 85.1 |
| 16 | 10,210 | 6,344 | 170.2 |
| 29 | 18,505 | 11,498 | 308.4 |
| 40 | 25,524 | 15,860 | 425.4 |
| 43 | 27,438 | 17,049 | 457.3 |
| 48 | 30,629 | 19,032 | 510.5 |
| 96 | 61,258 | 38,064 | 1,021.0 |
What Is the Speed Sensor Pulses Calculator?
The Speed Sensor Pulses Calculator is a tool that converts tire size and sensor tooth count into the pulse signal a vehicle computer reads. Vehicle speed sensors (VSS) and ABS wheel-speed sensors send a pulse for each tooth that passes.
Aftermarket speedometers, GPS-free data loggers and speed-signal correctors ask for pulses per mile. The calculator gives that figure for the tire actually fitted.
Common Uses
This calculator has 4 uses: gauge programming, signal correctors, sensor diagnosis and swap projects.
- Program gauges: Enter pulses per mile in aftermarket speedometers.
- Set signal correctors: Configure inline speed calibrators.
- Diagnose sensors: Compare expected and measured frequencies.
- Plan swap projects: Match a new transmission's sensor to the tires.