Motor torque calculator

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.

Enter the motor rated power

Enter the motor rated 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 motor torque calculator:

The above tool requires the following data for calculation:

Motor-rated power in HP or kW. (Mandatory)
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 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.
P_kW : Power in kilowatts.
Torque _in.lb: Torque in Inch – pounds.
P_hp : Power in horsepower.
Torque _ft.lb: Torque in Feet – pounds.

Full load torque of motors @ 1500rpm

kW	hp	Torque(Nm)	Torque(lb.ft)	Torque(lb.ft)
0.75	1	4.8	42.1	3.5
1.1	1.5	7.2	63.15	5.25
1.5	2	9.6	84.2	7
2.2	2.9	13.92	122.09	10.15
3	4	19.2	168.4	14
3.7	4.9	23.52	206.29	17.15
4	5.3	25.44	223.13	18.55
5	6.6	31.68	277.86	23.1
7.5	10	48	421	35
9.3	13	62.4	547.3	45.5
10	14	67.2	589.4	49
11	15	72	631.5	52.5
15	20	96	842	70
18	24	115.2	1010.4	84
22	29	139.2	1220.9	101.5
30	40	192	1684	140
37	49	235.2	2062.9	171.5
45	59	283.2	2483.9	206.5
55	72	345.6	3031.2	252
75	99	475.2	4167.9	346.5
90	118	566.4	4967.8	413
110	144	691.2	6062.4	504
130	170	816	7157	595
150	197	945.6	8293.7	689.5
175	229	1099.2	9640.9	801.5
200	262	1257.6	11030.2	917
225	295	1416	12419.5	1032.5
250	327	1569.6	13766.7	1144.5
275	360	1728	15156	1260
300	393	1886.4	16545.3	1375.5
350	458	2198.4	19281.8	1603
400	523	2510.4	22018.3	1830.5
450	589	2827.2	24796.9	2061.5
550	719	3451.2	30269.9	2516.5
600	785	3768	33048.5	2747.5

Other calculators:

2 thoughts on “Motor torque calculator | Full load torque of a motor”

Mark Pulley

November 9, 2022 at 1:06 am

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
- Electrical Classroom
  
  November 10, 2022 at 4:43 pm
  
  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.