Motor torque calculator | Full load torque of a motor

The full load torque of a motor is the maximum torque that the motor can deliver when it is fully loaded. Here is a simple motor torque calculator that can help you calculate the full load torque of a motor.

Motor torque calculator

Enter the motor rated power
Enter the motor rated speedRPM

Result

Torque in N.mN.m
Torque in lb.inlb.in
Torque in lb.ftlb.ft

How to use the motor torque calculator:

The above tool requires the following data for calculation:

  1. Motor-rated power in HP or kW. (Mandatory)
  2. Rated speed of the motor. (Mandatory)

The rated power and rated speed of the motor can be found on the nameplate of the motor. After entering the required data, click on the “Calculate” button to find out the full load torque of the motor.

Motor torque calculator

Motor torque calculation

Calculation of motor torque when it is rated in kilowatts:

    \[ Torque_(_N_._m_) =\frac{ 9549 \times P_k_W }{Rated-RPM} \]

Calculation of motor torque when it is rated in horsepower:

    \[ Torque_(_i_n_._l_b_) =\frac{ 63025 \times P_h_p}{Rated-RPM} \]

    \[ Torque_(_i_n_._f_t_) =\frac{ 5252 \times P_h_p}{Rated-RPM} \]

Where,

  • Torque N.m: Torque in Newton-meter.
  • PkW : Power in kilowatts.
  • Torque in.lb: Torque in Inch – pounds.
  • Php : Power in horsepower.
  • Torque ft.lb: Torque in Feet – pounds.

Full load torque of motors @ 1500rpm

kWhpTorque(Nm)Torque(lb.ft)Torque(lb.ft)
0.7514.842.13.5
1.11.57.263.155.25
1.529.684.27
2.22.913.92122.0910.15
3419.2168.414
3.74.923.52206.2917.15
45.325.44223.1318.55
56.631.68277.8623.1
7.5104842135
9.31362.4547.345.5
101467.2589.449
111572631.552.5
15209684270
1824115.21010.484
2229139.21220.9101.5
30401921684140
3749235.22062.9171.5
4559283.22483.9206.5
5572345.63031.2252
7599475.24167.9346.5
90118566.44967.8413
110144691.26062.4504
1301708167157595
150197945.68293.7689.5
1752291099.29640.9801.5
2002621257.611030.2917
225295141612419.51032.5
2503271569.613766.71144.5
2753601728151561260
3003931886.416545.31375.5
3504582198.419281.81603
4005232510.422018.31830.5
4505892827.224796.92061.5
5507193451.230269.92516.5
600785376833048.52747.5
Motor torque curve

Other calculators:

This Post Has 4 Comments

  1. Mark Pulley November 9, 2022 Reply

    Which one is correct the table or the calculator?

    55kW drive in table @1500rpm gives 525.2Nm

    55kW drive in calculator @1500rpm gives 350Nm

    Thanks

    1. Electrical Classroom November 10, 2022 Reply

      Hello Mark, Perhaps you are referring to the wrong value. Anyways, there could be quite a small variation between the calculated value and those in the table.

  2. D March 1, 2023 Reply

    Torque in “inch feet”.
    Good one.

  3. Srinivasa May 26, 2023 Reply

    Dear sir. Please advice us the finding the torque of universal motor. Thank🙏you.

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