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 speed	RPM

Result
Power in kW	kW
Power in hp	hp

Power-torque calculator

Enter the motor power

Enter the motor speed	RPM

Result
Torque in N.m	N.m
Torque in lb.in	lb.in
Torque in lb.ft	lb.ft

How to use the power-torque calculator:

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

Power in HP or kW and choose the input unit
Enter the motor speed in RPM. (Mandatory)
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:

Torque in Nm or lb.in and choose the input unit.
Enter the motor speed in RPM. (Mandatory)
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.
P_kW : Power in kilowatts.
Torque _in.lb: Torque in Inch – pounds.
P_hp : Power in horsepower.
Torque _ft.lb: Torque in Feet – pounds.

Power-torque table @ 1500rpm

kW	HP	Torque(Nm)	Torque(lb.ft)	Torque(lb.ft)
0.75	1	4.8	42.1	3.6
1.1	1.5	10.6	94.6	7.9
1.5	2	14.4	126.1	10.6
2.2	2.9	21.1	182.8	15.3
3	4	28.7	252.1	21.1
3.7	4.9	35.4	308.9	25.8
4	5.3	38.2	334.1	27.9
5	6.6	47.8	416	34.7
7.5	10	71.7	630.3	52.6
9.3	13	88.9	819.4	68.3
10	14	95.5	882.4	73.6
11	15	105.1	945.4	78.8
15	20	143.3	1260.5	105.1
18	24	171.9	1512.6	126.1
22	29	210.1	1827.8	152.4
30	40	286.5	2521	210.1
37	49	353.4	3088.3	257.4
45	59	429.8	3718.5	309.9
55	72	525.2	4537.8	378.2
75	99	716.2	6239.5	520
90	118	859.5	7437	619.8
110	144	1050.4	9075.6	756.3
130	170	1241.4	10714.3	892.9
150	197	1432.4	12416	1034.7
175	229	1671.1	14432.8	1202.8
200	262	1909.8	16512.6	1376.1
225	295	2148.6	18592.4	1549.4
250	327	2387.3	20609.2	1717.5
275	360	2626	22689	1890.8
300	393	2864.7	24768.9	2064.1
350	458	3342.2	28865.5	2405.5
400	523	3819.6	32962.1	2746.8
450	589	4297.1	37121.8	3093.5
550	719	5252	45315	3776.2
600	785	5729.4	49474.7	4122.9

Torque-power calculator & power-torque calculator curves

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