Torque-power calculator & power-torque calculator

Here is a calculator that can be used to calculate torque from power and power from torque.

Torque- power calculator

Enter motor torque
Enter the motor speedRPM

Result

Power in kWkW
Power in hphp

Power-torque calculator

Enter the motor power
Enter the motor speedRPM

Result

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

How to use the power-torque calculator:

The above power-torque calculator requires the following data for calculation:

  1. Power in HP or kW and choose the input unit
  2. Enter the motor speed in RPM. (Mandatory)
  3. After entering the required data, click on the “Calculate” button.

How to use the torque-power calculator:

The above torque-power calculator requires the following data for calculation:

  1. Torque in Nm or lb.in and choose the input unit.
  2. Enter the motor speed in RPM. (Mandatory)
  3. After entering the required data, click on the “Calculate” button.
Torque-power calculator & power-torque calculator

Formulae for Power calculation from torque

Calculation of kilowatts from torque:

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

Calculation of horsepower from torque:

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

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

Formulae for Torque calculation from power

Calculation of motor torque when it is rated in kilowatts:

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

Calculation of motor torque when it is rated in horsepower:

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

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

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.

Power-torque table @ 1500rpm

kWHPTorque(Nm)Torque(lb.ft)Torque(lb.ft)
0.7514.842.13.6
1.11.510.694.67.9
1.5214.4126.110.6
2.22.921.1182.815.3
3428.7252.121.1
3.74.935.4308.925.8
45.338.2334.127.9
56.647.841634.7
7.51071.7630.352.6
9.31388.9819.468.3
101495.5882.473.6
1115105.1945.478.8
1520143.31260.5105.1
1824171.91512.6126.1
2229210.11827.8152.4
3040286.52521210.1
3749353.43088.3257.4
4559429.83718.5309.9
5572525.24537.8378.2
7599716.26239.5520
90118859.57437619.8
1101441050.49075.6756.3
1301701241.410714.3892.9
1501971432.4124161034.7
1752291671.114432.81202.8
2002621909.816512.61376.1
2252952148.618592.41549.4
2503272387.320609.21717.5
2753602626226891890.8
3003932864.724768.92064.1
3504583342.228865.52405.5
4005233819.632962.12746.8
4505894297.137121.83093.5
5507195252453153776.2
6007855729.449474.74122.9
Torque-power calculator & power-torque calculator curves

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