Great Weapon Master Average Damage
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If a cell has red text, it means: your average damage per attack (DPA) with GWM is less than your average DPA without.
If a cell is highlighted in red, it means: you can't hit at all with GWM.

Note: The "Hit On" column is the value you would need to roll on a d20, before modifiers, to hit without GWM. When using GWM, your actual roll needed to hit is 5 higher.

Additional note: A typical two-handed weapon, like a greatsword, will deal somewhere between 2d6+2 and 2d6+8, depending on your Str and enchantments.
If we assume a Str of 20 and no enchants, average damage is 12.

So if you're average and hitting on a 9+ or better (or 11+ or better and have advantage), use your GWM. (Unless you can already kill the target in one hit.)
The relevant cell is outlined in sky blue.
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11
DPA increase from Great Weapon Master, without advantage
12
hit on \ dmg
12345678910111213141516171819202122232425262728293031
13
26.756.506.256.005.755.505.255.004.754.504.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75
14
36.256.005.755.505.255.004.754.504.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25
15
45.755.505.255.004.754.504.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75
16
55.255.004.754.504.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25
17
64.754.504.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75
18
74.254.003.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25
19
83.753.503.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75
20
93.253.002.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25
21
102.752.502.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75
22
112.252.001.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25
23
121.751.501.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75
24
131.251.000.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25
25
140.750.500.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75
26
150.250.00-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25
27
16-0.25-0.50-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25-7.50-7.75
28
17-0.75-1.00-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25-7.50-7.75-8.00-8.25
29
18-1.25-1.50-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25-7.50-7.75-8.00-8.25-8.50-8.75
30
19-1.75-2.00-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25-7.50-7.75-8.00-8.25-8.50-8.75-9.00-9.25
31
20-2.25-2.50-2.75-3.00-3.25-3.50-3.75-4.00-4.25-4.50-4.75-5.00-5.25-5.50-5.75-6.00-6.25-6.50-6.75-7.00-7.25-7.50-7.75-8.00-8.25-8.50-8.75-9.00-9.25-9.50-9.75
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33
34
DPA increase from Great Weapon Master, with advantage
35
hit on \ dmg
12345678910111213141516171819202122232425262728293031
36
29.018.938.848.758.668.588.498.408.318.238.148.057.967.887.797.707.617.537.447.357.267.187.097.006.916.836.746.656.566.486.39
37
38.668.558.448.338.218.107.997.887.767.657.547.437.317.207.096.986.866.756.646.536.416.306.196.085.965.855.745.635.515.405.29
38
48.268.137.997.857.717.587.447.307.167.036.896.756.616.486.346.206.065.935.795.655.515.385.245.104.964.834.694.554.414.284.14
39
57.817.657.497.337.167.006.846.686.516.356.196.035.865.705.545.385.215.054.894.734.564.404.244.083.913.753.593.433.263.102.94
40
67.317.136.946.756.566.386.196.005.815.635.445.255.064.884.694.504.314.133.943.753.563.383.193.002.812.632.442.252.061.881.69
41
76.766.556.346.135.915.705.495.285.064.854.644.434.214.003.793.583.363.152.942.732.512.302.091.881.661.451.241.030.810.600.39
42
86.165.935.695.455.214.984.744.504.264.033.793.553.313.082.842.602.362.131.891.651.411.180.940.700.460.22-0.01-0.25-0.49-0.72-0.96
43
95.515.254.994.734.464.203.943.683.413.152.892.632.362.101.841.581.311.050.790.520.260.00-0.26-0.52-0.79-1.05-1.31-1.58-1.84-2.10-2.36
44
104.814.534.243.953.663.383.092.802.512.231.941.651.361.080.790.500.21-0.08-0.36-0.65-0.94-1.23-1.51-1.80-2.09-2.38-2.66-2.95-3.24-3.53-3.81
45
114.063.753.443.132.812.502.191.881.561.250.940.630.310.00-0.31-0.63-0.94-1.25-1.56-1.88-2.19-2.50-2.81-3.13-3.44-3.75-4.06-4.38-4.69-5.00-5.31
46
123.262.932.592.251.911.581.240.900.560.23-0.11-0.45-0.79-1.13-1.46-1.80-2.14-2.48-2.81-3.15-3.49-3.83-4.16-4.50-4.84-5.18-5.51-5.85-6.19-6.53-6.86
47
132.412.051.691.330.960.600.24-0.13-0.49-0.85-1.21-1.58-1.94-2.30-2.66-3.03-3.39-3.75-4.11-4.48-4.84-5.20-5.56-5.93-6.29-6.65-7.01-7.38-7.74-8.10-8.46
48
141.511.130.740.35-0.04-0.43-0.81-1.20-1.59-1.98-2.36-2.75-3.14-3.53-3.91-4.30-4.69-5.08-5.46-5.85-6.24-6.63-7.01-7.40-7.79-8.18-8.56-8.95-9.34-9.73-10.11
49
150.560.15-0.26-0.68-1.09-1.50-1.91-2.33-2.74-3.15-3.56-3.98-4.39-4.80-5.21-5.63-6.04-6.45-6.86-7.28-7.69-8.10-8.51-8.93-9.34-9.75-10.16-10.58-10.99-11.40-11.81
50
16-0.44-0.88-1.31-1.75-2.19-2.63-3.06-3.50-3.94-4.38-4.81-5.25-5.69-6.13-6.56-7.00-7.44-7.88-8.31-8.75-9.19-9.63-10.06-10.50-10.94-11.38-11.81-12.25-12.69-13.13-13.56
51
17-1.49-1.95-2.41-2.88-3.34-3.80-4.26-4.73-5.19-5.65-6.11-6.58-7.04-7.50-7.96-8.43-8.89-9.35-9.81-10.28-10.74-11.20-11.66-12.13-12.59-13.05-13.51-13.98-14.44-14.90-15.36
52
18-2.59-3.08-3.56-4.05-4.54-5.03-5.51-6.00-6.49-6.98-7.46-7.95-8.44-8.93-9.41-9.90-10.39-10.88-11.36-11.85-12.34-12.83-13.31-13.80-14.29-14.78-15.26-15.75-16.24-16.73-17.21
53
19-3.74-4.25-4.76-5.28-5.79-6.30-6.81-7.33-7.84-8.35-8.86-9.38-9.89-10.40-10.91-11.43-11.94-12.45-12.96-13.48-13.99-14.50-15.01-15.53-16.04-16.55-17.06-17.58-18.09-18.60-19.11
54
20-4.94-5.48-6.01-6.55-7.09-7.63-8.16-8.70-9.24-9.78-10.31-10.85-11.39-11.93-12.46-13.00-13.54-14.08-14.61-15.15-15.69-16.23-16.76-17.30-17.84-18.38-18.91-19.45-19.99-20.53-21.06
55
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