ip
ipku.in

IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

$ ipcalc
private IP (RFC 1918)10.4.100.0/24
network10.4.100.0/24
broadcast10.4.100.255
first host10.4.100.1
last host10.4.100.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.4.100.0/24
address00001010.00000100.01100100.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.00000100.01100100.00000000
broadcast00001010.00000100.01100100.11111111
green = network part, grey = host part
hex0x0a046400
decimal168059904
reverse dns0.100.4.10.in-addr.arpa
ipv4-mapped::ffff:a04:6400

/24 split into /32 · 256 subnets

close ×
#networkhost rangebroadcast
110.4.100.0/3210.4.100.0 – 10.4.100.010.4.100.0
210.4.100.1/3210.4.100.1 – 10.4.100.110.4.100.1
310.4.100.2/3210.4.100.2 – 10.4.100.210.4.100.2
410.4.100.3/3210.4.100.3 – 10.4.100.310.4.100.3
510.4.100.4/3210.4.100.4 – 10.4.100.410.4.100.4
610.4.100.5/3210.4.100.5 – 10.4.100.510.4.100.5
710.4.100.6/3210.4.100.6 – 10.4.100.610.4.100.6
810.4.100.7/3210.4.100.7 – 10.4.100.710.4.100.7
910.4.100.8/3210.4.100.8 – 10.4.100.810.4.100.8
1010.4.100.9/3210.4.100.9 – 10.4.100.910.4.100.9
1110.4.100.10/3210.4.100.10 – 10.4.100.1010.4.100.10
1210.4.100.11/3210.4.100.11 – 10.4.100.1110.4.100.11
1310.4.100.12/3210.4.100.12 – 10.4.100.1210.4.100.12
1410.4.100.13/3210.4.100.13 – 10.4.100.1310.4.100.13
1510.4.100.14/3210.4.100.14 – 10.4.100.1410.4.100.14
1610.4.100.15/3210.4.100.15 – 10.4.100.1510.4.100.15
1710.4.100.16/3210.4.100.16 – 10.4.100.1610.4.100.16
1810.4.100.17/3210.4.100.17 – 10.4.100.1710.4.100.17
1910.4.100.18/3210.4.100.18 – 10.4.100.1810.4.100.18
2010.4.100.19/3210.4.100.19 – 10.4.100.1910.4.100.19
2110.4.100.20/3210.4.100.20 – 10.4.100.2010.4.100.20
2210.4.100.21/3210.4.100.21 – 10.4.100.2110.4.100.21
2310.4.100.22/3210.4.100.22 – 10.4.100.2210.4.100.22
2410.4.100.23/3210.4.100.23 – 10.4.100.2310.4.100.23
2510.4.100.24/3210.4.100.24 – 10.4.100.2410.4.100.24
2610.4.100.25/3210.4.100.25 – 10.4.100.2510.4.100.25
2710.4.100.26/3210.4.100.26 – 10.4.100.2610.4.100.26
2810.4.100.27/3210.4.100.27 – 10.4.100.2710.4.100.27
2910.4.100.28/3210.4.100.28 – 10.4.100.2810.4.100.28
3010.4.100.29/3210.4.100.29 – 10.4.100.2910.4.100.29
3110.4.100.30/3210.4.100.30 – 10.4.100.3010.4.100.30
3210.4.100.31/3210.4.100.31 – 10.4.100.3110.4.100.31
3310.4.100.32/3210.4.100.32 – 10.4.100.3210.4.100.32
3410.4.100.33/3210.4.100.33 – 10.4.100.3310.4.100.33
3510.4.100.34/3210.4.100.34 – 10.4.100.3410.4.100.34
3610.4.100.35/3210.4.100.35 – 10.4.100.3510.4.100.35
3710.4.100.36/3210.4.100.36 – 10.4.100.3610.4.100.36
3810.4.100.37/3210.4.100.37 – 10.4.100.3710.4.100.37
3910.4.100.38/3210.4.100.38 – 10.4.100.3810.4.100.38
4010.4.100.39/3210.4.100.39 – 10.4.100.3910.4.100.39
4110.4.100.40/3210.4.100.40 – 10.4.100.4010.4.100.40
4210.4.100.41/3210.4.100.41 – 10.4.100.4110.4.100.41
4310.4.100.42/3210.4.100.42 – 10.4.100.4210.4.100.42
4410.4.100.43/3210.4.100.43 – 10.4.100.4310.4.100.43
4510.4.100.44/3210.4.100.44 – 10.4.100.4410.4.100.44
4610.4.100.45/3210.4.100.45 – 10.4.100.4510.4.100.45
4710.4.100.46/3210.4.100.46 – 10.4.100.4610.4.100.46
4810.4.100.47/3210.4.100.47 – 10.4.100.4710.4.100.47
4910.4.100.48/3210.4.100.48 – 10.4.100.4810.4.100.48
5010.4.100.49/3210.4.100.49 – 10.4.100.4910.4.100.49
5110.4.100.50/3210.4.100.50 – 10.4.100.5010.4.100.50
5210.4.100.51/3210.4.100.51 – 10.4.100.5110.4.100.51
5310.4.100.52/3210.4.100.52 – 10.4.100.5210.4.100.52
5410.4.100.53/3210.4.100.53 – 10.4.100.5310.4.100.53
5510.4.100.54/3210.4.100.54 – 10.4.100.5410.4.100.54
5610.4.100.55/3210.4.100.55 – 10.4.100.5510.4.100.55
5710.4.100.56/3210.4.100.56 – 10.4.100.5610.4.100.56
5810.4.100.57/3210.4.100.57 – 10.4.100.5710.4.100.57
5910.4.100.58/3210.4.100.58 – 10.4.100.5810.4.100.58
6010.4.100.59/3210.4.100.59 – 10.4.100.5910.4.100.59
6110.4.100.60/3210.4.100.60 – 10.4.100.6010.4.100.60
6210.4.100.61/3210.4.100.61 – 10.4.100.6110.4.100.61
6310.4.100.62/3210.4.100.62 – 10.4.100.6210.4.100.62
6410.4.100.63/3210.4.100.63 – 10.4.100.6310.4.100.63
6510.4.100.64/3210.4.100.64 – 10.4.100.6410.4.100.64
6610.4.100.65/3210.4.100.65 – 10.4.100.6510.4.100.65
6710.4.100.66/3210.4.100.66 – 10.4.100.6610.4.100.66
6810.4.100.67/3210.4.100.67 – 10.4.100.6710.4.100.67
6910.4.100.68/3210.4.100.68 – 10.4.100.6810.4.100.68
7010.4.100.69/3210.4.100.69 – 10.4.100.6910.4.100.69
7110.4.100.70/3210.4.100.70 – 10.4.100.7010.4.100.70
7210.4.100.71/3210.4.100.71 – 10.4.100.7110.4.100.71
7310.4.100.72/3210.4.100.72 – 10.4.100.7210.4.100.72
7410.4.100.73/3210.4.100.73 – 10.4.100.7310.4.100.73
7510.4.100.74/3210.4.100.74 – 10.4.100.7410.4.100.74
7610.4.100.75/3210.4.100.75 – 10.4.100.7510.4.100.75
7710.4.100.76/3210.4.100.76 – 10.4.100.7610.4.100.76
7810.4.100.77/3210.4.100.77 – 10.4.100.7710.4.100.77
7910.4.100.78/3210.4.100.78 – 10.4.100.7810.4.100.78
8010.4.100.79/3210.4.100.79 – 10.4.100.7910.4.100.79
8110.4.100.80/3210.4.100.80 – 10.4.100.8010.4.100.80
8210.4.100.81/3210.4.100.81 – 10.4.100.8110.4.100.81
8310.4.100.82/3210.4.100.82 – 10.4.100.8210.4.100.82
8410.4.100.83/3210.4.100.83 – 10.4.100.8310.4.100.83
8510.4.100.84/3210.4.100.84 – 10.4.100.8410.4.100.84
8610.4.100.85/3210.4.100.85 – 10.4.100.8510.4.100.85
8710.4.100.86/3210.4.100.86 – 10.4.100.8610.4.100.86
8810.4.100.87/3210.4.100.87 – 10.4.100.8710.4.100.87
8910.4.100.88/3210.4.100.88 – 10.4.100.8810.4.100.88
9010.4.100.89/3210.4.100.89 – 10.4.100.8910.4.100.89
9110.4.100.90/3210.4.100.90 – 10.4.100.9010.4.100.90
9210.4.100.91/3210.4.100.91 – 10.4.100.9110.4.100.91
9310.4.100.92/3210.4.100.92 – 10.4.100.9210.4.100.92
9410.4.100.93/3210.4.100.93 – 10.4.100.9310.4.100.93
9510.4.100.94/3210.4.100.94 – 10.4.100.9410.4.100.94
9610.4.100.95/3210.4.100.95 – 10.4.100.9510.4.100.95
9710.4.100.96/3210.4.100.96 – 10.4.100.9610.4.100.96
9810.4.100.97/3210.4.100.97 – 10.4.100.9710.4.100.97
9910.4.100.98/3210.4.100.98 – 10.4.100.9810.4.100.98
10010.4.100.99/3210.4.100.99 – 10.4.100.9910.4.100.99
10110.4.100.100/3210.4.100.100 – 10.4.100.10010.4.100.100
10210.4.100.101/3210.4.100.101 – 10.4.100.10110.4.100.101
10310.4.100.102/3210.4.100.102 – 10.4.100.10210.4.100.102
10410.4.100.103/3210.4.100.103 – 10.4.100.10310.4.100.103
10510.4.100.104/3210.4.100.104 – 10.4.100.10410.4.100.104
10610.4.100.105/3210.4.100.105 – 10.4.100.10510.4.100.105
10710.4.100.106/3210.4.100.106 – 10.4.100.10610.4.100.106
10810.4.100.107/3210.4.100.107 – 10.4.100.10710.4.100.107
10910.4.100.108/3210.4.100.108 – 10.4.100.10810.4.100.108
11010.4.100.109/3210.4.100.109 – 10.4.100.10910.4.100.109
11110.4.100.110/3210.4.100.110 – 10.4.100.11010.4.100.110
11210.4.100.111/3210.4.100.111 – 10.4.100.11110.4.100.111
11310.4.100.112/3210.4.100.112 – 10.4.100.11210.4.100.112
11410.4.100.113/3210.4.100.113 – 10.4.100.11310.4.100.113
11510.4.100.114/3210.4.100.114 – 10.4.100.11410.4.100.114
11610.4.100.115/3210.4.100.115 – 10.4.100.11510.4.100.115
11710.4.100.116/3210.4.100.116 – 10.4.100.11610.4.100.116
11810.4.100.117/3210.4.100.117 – 10.4.100.11710.4.100.117
11910.4.100.118/3210.4.100.118 – 10.4.100.11810.4.100.118
12010.4.100.119/3210.4.100.119 – 10.4.100.11910.4.100.119
12110.4.100.120/3210.4.100.120 – 10.4.100.12010.4.100.120
12210.4.100.121/3210.4.100.121 – 10.4.100.12110.4.100.121
12310.4.100.122/3210.4.100.122 – 10.4.100.12210.4.100.122
12410.4.100.123/3210.4.100.123 – 10.4.100.12310.4.100.123
12510.4.100.124/3210.4.100.124 – 10.4.100.12410.4.100.124
12610.4.100.125/3210.4.100.125 – 10.4.100.12510.4.100.125
12710.4.100.126/3210.4.100.126 – 10.4.100.12610.4.100.126
12810.4.100.127/3210.4.100.127 – 10.4.100.12710.4.100.127
12910.4.100.128/3210.4.100.128 – 10.4.100.12810.4.100.128
13010.4.100.129/3210.4.100.129 – 10.4.100.12910.4.100.129
13110.4.100.130/3210.4.100.130 – 10.4.100.13010.4.100.130
13210.4.100.131/3210.4.100.131 – 10.4.100.13110.4.100.131
13310.4.100.132/3210.4.100.132 – 10.4.100.13210.4.100.132
13410.4.100.133/3210.4.100.133 – 10.4.100.13310.4.100.133
13510.4.100.134/3210.4.100.134 – 10.4.100.13410.4.100.134
13610.4.100.135/3210.4.100.135 – 10.4.100.13510.4.100.135
13710.4.100.136/3210.4.100.136 – 10.4.100.13610.4.100.136
13810.4.100.137/3210.4.100.137 – 10.4.100.13710.4.100.137
13910.4.100.138/3210.4.100.138 – 10.4.100.13810.4.100.138
14010.4.100.139/3210.4.100.139 – 10.4.100.13910.4.100.139
14110.4.100.140/3210.4.100.140 – 10.4.100.14010.4.100.140
14210.4.100.141/3210.4.100.141 – 10.4.100.14110.4.100.141
14310.4.100.142/3210.4.100.142 – 10.4.100.14210.4.100.142
14410.4.100.143/3210.4.100.143 – 10.4.100.14310.4.100.143
14510.4.100.144/3210.4.100.144 – 10.4.100.14410.4.100.144
14610.4.100.145/3210.4.100.145 – 10.4.100.14510.4.100.145
14710.4.100.146/3210.4.100.146 – 10.4.100.14610.4.100.146
14810.4.100.147/3210.4.100.147 – 10.4.100.14710.4.100.147
14910.4.100.148/3210.4.100.148 – 10.4.100.14810.4.100.148
15010.4.100.149/3210.4.100.149 – 10.4.100.14910.4.100.149
15110.4.100.150/3210.4.100.150 – 10.4.100.15010.4.100.150
15210.4.100.151/3210.4.100.151 – 10.4.100.15110.4.100.151
15310.4.100.152/3210.4.100.152 – 10.4.100.15210.4.100.152
15410.4.100.153/3210.4.100.153 – 10.4.100.15310.4.100.153
15510.4.100.154/3210.4.100.154 – 10.4.100.15410.4.100.154
15610.4.100.155/3210.4.100.155 – 10.4.100.15510.4.100.155
15710.4.100.156/3210.4.100.156 – 10.4.100.15610.4.100.156
15810.4.100.157/3210.4.100.157 – 10.4.100.15710.4.100.157
15910.4.100.158/3210.4.100.158 – 10.4.100.15810.4.100.158
16010.4.100.159/3210.4.100.159 – 10.4.100.15910.4.100.159
16110.4.100.160/3210.4.100.160 – 10.4.100.16010.4.100.160
16210.4.100.161/3210.4.100.161 – 10.4.100.16110.4.100.161
16310.4.100.162/3210.4.100.162 – 10.4.100.16210.4.100.162
16410.4.100.163/3210.4.100.163 – 10.4.100.16310.4.100.163
16510.4.100.164/3210.4.100.164 – 10.4.100.16410.4.100.164
16610.4.100.165/3210.4.100.165 – 10.4.100.16510.4.100.165
16710.4.100.166/3210.4.100.166 – 10.4.100.16610.4.100.166
16810.4.100.167/3210.4.100.167 – 10.4.100.16710.4.100.167
16910.4.100.168/3210.4.100.168 – 10.4.100.16810.4.100.168
17010.4.100.169/3210.4.100.169 – 10.4.100.16910.4.100.169
17110.4.100.170/3210.4.100.170 – 10.4.100.17010.4.100.170
17210.4.100.171/3210.4.100.171 – 10.4.100.17110.4.100.171
17310.4.100.172/3210.4.100.172 – 10.4.100.17210.4.100.172
17410.4.100.173/3210.4.100.173 – 10.4.100.17310.4.100.173
17510.4.100.174/3210.4.100.174 – 10.4.100.17410.4.100.174
17610.4.100.175/3210.4.100.175 – 10.4.100.17510.4.100.175
17710.4.100.176/3210.4.100.176 – 10.4.100.17610.4.100.176
17810.4.100.177/3210.4.100.177 – 10.4.100.17710.4.100.177
17910.4.100.178/3210.4.100.178 – 10.4.100.17810.4.100.178
18010.4.100.179/3210.4.100.179 – 10.4.100.17910.4.100.179
18110.4.100.180/3210.4.100.180 – 10.4.100.18010.4.100.180
18210.4.100.181/3210.4.100.181 – 10.4.100.18110.4.100.181
18310.4.100.182/3210.4.100.182 – 10.4.100.18210.4.100.182
18410.4.100.183/3210.4.100.183 – 10.4.100.18310.4.100.183
18510.4.100.184/3210.4.100.184 – 10.4.100.18410.4.100.184
18610.4.100.185/3210.4.100.185 – 10.4.100.18510.4.100.185
18710.4.100.186/3210.4.100.186 – 10.4.100.18610.4.100.186
18810.4.100.187/3210.4.100.187 – 10.4.100.18710.4.100.187
18910.4.100.188/3210.4.100.188 – 10.4.100.18810.4.100.188
19010.4.100.189/3210.4.100.189 – 10.4.100.18910.4.100.189
19110.4.100.190/3210.4.100.190 – 10.4.100.19010.4.100.190
19210.4.100.191/3210.4.100.191 – 10.4.100.19110.4.100.191
19310.4.100.192/3210.4.100.192 – 10.4.100.19210.4.100.192
19410.4.100.193/3210.4.100.193 – 10.4.100.19310.4.100.193
19510.4.100.194/3210.4.100.194 – 10.4.100.19410.4.100.194
19610.4.100.195/3210.4.100.195 – 10.4.100.19510.4.100.195
19710.4.100.196/3210.4.100.196 – 10.4.100.19610.4.100.196
19810.4.100.197/3210.4.100.197 – 10.4.100.19710.4.100.197
19910.4.100.198/3210.4.100.198 – 10.4.100.19810.4.100.198
20010.4.100.199/3210.4.100.199 – 10.4.100.19910.4.100.199
20110.4.100.200/3210.4.100.200 – 10.4.100.20010.4.100.200
20210.4.100.201/3210.4.100.201 – 10.4.100.20110.4.100.201
20310.4.100.202/3210.4.100.202 – 10.4.100.20210.4.100.202
20410.4.100.203/3210.4.100.203 – 10.4.100.20310.4.100.203
20510.4.100.204/3210.4.100.204 – 10.4.100.20410.4.100.204
20610.4.100.205/3210.4.100.205 – 10.4.100.20510.4.100.205
20710.4.100.206/3210.4.100.206 – 10.4.100.20610.4.100.206
20810.4.100.207/3210.4.100.207 – 10.4.100.20710.4.100.207
20910.4.100.208/3210.4.100.208 – 10.4.100.20810.4.100.208
21010.4.100.209/3210.4.100.209 – 10.4.100.20910.4.100.209
21110.4.100.210/3210.4.100.210 – 10.4.100.21010.4.100.210
21210.4.100.211/3210.4.100.211 – 10.4.100.21110.4.100.211
21310.4.100.212/3210.4.100.212 – 10.4.100.21210.4.100.212
21410.4.100.213/3210.4.100.213 – 10.4.100.21310.4.100.213
21510.4.100.214/3210.4.100.214 – 10.4.100.21410.4.100.214
21610.4.100.215/3210.4.100.215 – 10.4.100.21510.4.100.215
21710.4.100.216/3210.4.100.216 – 10.4.100.21610.4.100.216
21810.4.100.217/3210.4.100.217 – 10.4.100.21710.4.100.217
21910.4.100.218/3210.4.100.218 – 10.4.100.21810.4.100.218
22010.4.100.219/3210.4.100.219 – 10.4.100.21910.4.100.219
22110.4.100.220/3210.4.100.220 – 10.4.100.22010.4.100.220
22210.4.100.221/3210.4.100.221 – 10.4.100.22110.4.100.221
22310.4.100.222/3210.4.100.222 – 10.4.100.22210.4.100.222
22410.4.100.223/3210.4.100.223 – 10.4.100.22310.4.100.223
22510.4.100.224/3210.4.100.224 – 10.4.100.22410.4.100.224
22610.4.100.225/3210.4.100.225 – 10.4.100.22510.4.100.225
22710.4.100.226/3210.4.100.226 – 10.4.100.22610.4.100.226
22810.4.100.227/3210.4.100.227 – 10.4.100.22710.4.100.227
22910.4.100.228/3210.4.100.228 – 10.4.100.22810.4.100.228
23010.4.100.229/3210.4.100.229 – 10.4.100.22910.4.100.229
23110.4.100.230/3210.4.100.230 – 10.4.100.23010.4.100.230
23210.4.100.231/3210.4.100.231 – 10.4.100.23110.4.100.231
23310.4.100.232/3210.4.100.232 – 10.4.100.23210.4.100.232
23410.4.100.233/3210.4.100.233 – 10.4.100.23310.4.100.233
23510.4.100.234/3210.4.100.234 – 10.4.100.23410.4.100.234
23610.4.100.235/3210.4.100.235 – 10.4.100.23510.4.100.235
23710.4.100.236/3210.4.100.236 – 10.4.100.23610.4.100.236
23810.4.100.237/3210.4.100.237 – 10.4.100.23710.4.100.237
23910.4.100.238/3210.4.100.238 – 10.4.100.23810.4.100.238
24010.4.100.239/3210.4.100.239 – 10.4.100.23910.4.100.239
24110.4.100.240/3210.4.100.240 – 10.4.100.24010.4.100.240
24210.4.100.241/3210.4.100.241 – 10.4.100.24110.4.100.241
24310.4.100.242/3210.4.100.242 – 10.4.100.24210.4.100.242
24410.4.100.243/3210.4.100.243 – 10.4.100.24310.4.100.243
24510.4.100.244/3210.4.100.244 – 10.4.100.24410.4.100.244
24610.4.100.245/3210.4.100.245 – 10.4.100.24510.4.100.245
24710.4.100.246/3210.4.100.246 – 10.4.100.24610.4.100.246
24810.4.100.247/3210.4.100.247 – 10.4.100.24710.4.100.247
24910.4.100.248/3210.4.100.248 – 10.4.100.24810.4.100.248
25010.4.100.249/3210.4.100.249 – 10.4.100.24910.4.100.249
25110.4.100.250/3210.4.100.250 – 10.4.100.25010.4.100.250
25210.4.100.251/3210.4.100.251 – 10.4.100.25110.4.100.251
25310.4.100.252/3210.4.100.252 – 10.4.100.25210.4.100.252
25410.4.100.253/3210.4.100.253 – 10.4.100.25310.4.100.253
25510.4.100.254/3210.4.100.254 – 10.4.100.25410.4.100.254
25610.4.100.255/3210.4.100.255 – 10.4.100.25510.4.100.255
01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefixsubnet maskaddresseshostsin your /24
/00.0.0.04,294,967,2964,294,967,294-
/1128.0.0.02,147,483,6482,147,483,646-
/2192.0.0.01,073,741,8241,073,741,822-
/3224.0.0.0536,870,912536,870,910-
/4240.0.0.0268,435,456268,435,454-
/5248.0.0.0134,217,728134,217,726-
/6252.0.0.067,108,86467,108,862-
/7254.0.0.033,554,43233,554,430-
/8255.0.0.016,777,21616,777,214-
/9255.128.0.08,388,6088,388,606-
/10255.192.0.04,194,3044,194,302-
/11255.224.0.02,097,1522,097,150-
/12255.240.0.01,048,5761,048,574-
/13255.248.0.0524,288524,286-
/14255.252.0.0262,144262,142-
/15255.254.0.0131,072131,070-
/16255.255.0.065,53665,534-
/17255.255.128.032,76832,766-
/18255.255.192.016,38416,382-
/19255.255.224.08,1928,190-
/20255.255.240.04,0964,094-
/21255.255.248.02,0482,046-
/22255.255.252.01,0241,022-
/23255.255.254.0512510-
/24255.255.255.02562541
/25255.255.255.1281281262 split →
/26255.255.255.19264624 split →
/27255.255.255.22432308 split →
/28255.255.255.240161416 split →
/29255.255.255.2488632 split →
/30255.255.255.2524264 split →
/31255.255.255.25422128 split →
/32255.255.255.25511256 split →
02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →