Torque-speed calculator & speed-torque calculator

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

Torque-speed calculator

Enter motor torque
Enter motor power

Result
Motor speed	rpm

Speed-torque calculator

Enter the motor speed	RPM
Enter the motor power

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

How to use the Speed-torque calculator:

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

Enter motor speed in RPM. (Mandatory)
Enter power in hp or kW and choose the input unit
After entering the required data, click on the “Calculate” button.

How to use the torque-speed calculator:

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

Torque in Nm or lb.in and choose the input unit.
Enter power in hp or kW and choose the input unit
After entering the required data, click on the “Calculate” button.

Torque-speed calculator & speed-torque calculator

Formulae for speed calculation from torque

Calculation of motor speed when the power is in kilowatts:

$Speed \hspace{1 mm} in \hspace{1 mm} rpm =\frac{ 9549 \times P_k_W }{Torque_(_N_._m_)}$

Calculation of motor speed when the power is in horsepower:

$Speed \hspace{1 mm} in \hspace{1 mm} rpm =\frac{ 63025 \times P_h_p}{Torque_(_i_n_._l_b_)}$

$Speed \hspace{1 mm} in \hspace{1 mm} rpm =\frac{ 5252 \times P_h_p}{Torque_(_i_n_._f_t_)}$

Formulae for torque calculation from speed

Calculation of motor torque when the power is in kilowatts:

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

Calculation of motor torque when the power is 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-speed calculator & speed-torque calculator curves

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