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Press brake bending tonnage and force calculator

You can use this calculator to calculate necessary tonnage for press brake to perform the bending of necessary part. It means that you can verify the max. tonnage according to the technical specification of press brake or check the max. obtained tonnage by the press brake bending tooling compare to the necessary force. All bending tools have limits of force to be used.
This calculator is used for standard air bending process.

Legend:
F (Force), kN - total necessary force to execute the bend
s (thickness), mm - thickness of material to bend
V (opening), mm - opening of the bending die
h (resting part), mm - minimum necessary length of rest of the sheet before the bend
L (width of the bend), mm - main width of the part to be bended
R (radius), mm - internal radius of bended shape
TS - material tensile strength

The main formula to calculate
the bending force: F = (1,42 x TS x S2 x L)/1000 x V
internal radius: R = (5 x V) / 32

Press brake bending tonnage and force calculator Please use point, not comma if the number not integer

Sheet thickness (s), mm
Tensile strength (TS), kg/mm2
Die opening (V), mm
Width of bending (L), mm
Bending angle (ɑ)
Min. rest length (h), mm
Bending force (F), tons
Internal radius (R), mm


Please be informed that the present calculation only for general purposes. The type of metal and other indication points could be different and the calculation can't be done in the precision way.

Press brake force chart

Information chart for necessary tonnage for 1 meter bending width (L) for mild steel material:
V H min R 0,5 0,8 1 1,2 1,5 1,8 2 2,5 3 3,5 4 4,5 5 6 7 8 9 10 12 15 18 20
6 5 1 2,5 6,5 10
8 6 1,3 2 5 8 11
10 7 1,7 1,5 4 6 9 13
12 9 2 3 5 7 11 16
15 12 2,7 4 6 9 13 16
20 15 3,3 4 7 10 13 19
26 18 4,2 5 7,5 10 14 21
30 22 5 6,5 8 12 19 24
32 23 5,4 7,5 11,6 17 23 30
37 25 5,8 10 14,5 20 26 33
42 29 6,7 13 17 23 29 35,5
45 32 7,5 16 21 27 33 48
50 36 8,3 19 24 30 43 58
60 43 10 20 25 36 49 64
70 50 11,5 21 31 42 55 69
80 57 13,5 27 37 48 60 75
90 64 15 32 42 54 66 95
100 71 17 38 48 60 86 134
130 93 22 37 46 66 103 149
180 130 30 33 48 75 107 133
200 145 33 43 67 97 119
250 180 42 54 77 95

Additional

Press brake tools description


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