Torque Converter Slip Calculator
SI
Imp
Imperial
Inputs
View results
Measured engine speed
(n_e)
Actual logged or observed engine RPM.
rpm
Road speed
(v)
Vehicle speed at the measured RPM.
mph
Tire diameter
(D)
Rolling tire diameter.
in
Transmission ratio
(G)
Selected gear ratio.
Final drive ratio
(F)
Axle or differential ratio.
Transfer ratio
(T)
Use 1.0 if there is no transfer case or auxiliary ratio.
Results
Default result
Edit inputs
Slip
36.7
%
Out of tol.
Also computed
Slip RPM
Out of tol.
806
rpm
Locked RPM
2,194
rpm
Wheel speed
840.3
rpm
Overall ratio
2.611
Method notes
2 notes
Positive slip means measured RPM is higher than locked mechanical RPM. Negative slip usually means tire diameter, speed or ratio data is off.
Automatic transmissions can show different slip under load, coast, lockup and transient shift conditions.
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