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)10.97.80.0/24
network10.97.80.0/24
broadcast10.97.80.255
first host10.97.80.1
last host10.97.80.254
subnet mask255.255.255.0
wildcard0.0.0.255
addresses256
usable hosts254
classA
ipcalc 10.97.80.0/24
address00001010.01100001.01010000.00000000
subnet mask11111111.11111111.11111111.00000000
network00001010.01100001.01010000.00000000
broadcast00001010.01100001.01010000.11111111
green = network part, grey = host part
hex0x0a615000
decimal174149632
reverse dns0.80.97.10.in-addr.arpa
ipv4-mapped::ffff:a61:5000

/24 split into /32 · 256 subnets

close ×
#networkhost rangebroadcast
110.97.80.0/3210.97.80.0 – 10.97.80.010.97.80.0
210.97.80.1/3210.97.80.1 – 10.97.80.110.97.80.1
310.97.80.2/3210.97.80.2 – 10.97.80.210.97.80.2
410.97.80.3/3210.97.80.3 – 10.97.80.310.97.80.3
510.97.80.4/3210.97.80.4 – 10.97.80.410.97.80.4
610.97.80.5/3210.97.80.5 – 10.97.80.510.97.80.5
710.97.80.6/3210.97.80.6 – 10.97.80.610.97.80.6
810.97.80.7/3210.97.80.7 – 10.97.80.710.97.80.7
910.97.80.8/3210.97.80.8 – 10.97.80.810.97.80.8
1010.97.80.9/3210.97.80.9 – 10.97.80.910.97.80.9
1110.97.80.10/3210.97.80.10 – 10.97.80.1010.97.80.10
1210.97.80.11/3210.97.80.11 – 10.97.80.1110.97.80.11
1310.97.80.12/3210.97.80.12 – 10.97.80.1210.97.80.12
1410.97.80.13/3210.97.80.13 – 10.97.80.1310.97.80.13
1510.97.80.14/3210.97.80.14 – 10.97.80.1410.97.80.14
1610.97.80.15/3210.97.80.15 – 10.97.80.1510.97.80.15
1710.97.80.16/3210.97.80.16 – 10.97.80.1610.97.80.16
1810.97.80.17/3210.97.80.17 – 10.97.80.1710.97.80.17
1910.97.80.18/3210.97.80.18 – 10.97.80.1810.97.80.18
2010.97.80.19/3210.97.80.19 – 10.97.80.1910.97.80.19
2110.97.80.20/3210.97.80.20 – 10.97.80.2010.97.80.20
2210.97.80.21/3210.97.80.21 – 10.97.80.2110.97.80.21
2310.97.80.22/3210.97.80.22 – 10.97.80.2210.97.80.22
2410.97.80.23/3210.97.80.23 – 10.97.80.2310.97.80.23
2510.97.80.24/3210.97.80.24 – 10.97.80.2410.97.80.24
2610.97.80.25/3210.97.80.25 – 10.97.80.2510.97.80.25
2710.97.80.26/3210.97.80.26 – 10.97.80.2610.97.80.26
2810.97.80.27/3210.97.80.27 – 10.97.80.2710.97.80.27
2910.97.80.28/3210.97.80.28 – 10.97.80.2810.97.80.28
3010.97.80.29/3210.97.80.29 – 10.97.80.2910.97.80.29
3110.97.80.30/3210.97.80.30 – 10.97.80.3010.97.80.30
3210.97.80.31/3210.97.80.31 – 10.97.80.3110.97.80.31
3310.97.80.32/3210.97.80.32 – 10.97.80.3210.97.80.32
3410.97.80.33/3210.97.80.33 – 10.97.80.3310.97.80.33
3510.97.80.34/3210.97.80.34 – 10.97.80.3410.97.80.34
3610.97.80.35/3210.97.80.35 – 10.97.80.3510.97.80.35
3710.97.80.36/3210.97.80.36 – 10.97.80.3610.97.80.36
3810.97.80.37/3210.97.80.37 – 10.97.80.3710.97.80.37
3910.97.80.38/3210.97.80.38 – 10.97.80.3810.97.80.38
4010.97.80.39/3210.97.80.39 – 10.97.80.3910.97.80.39
4110.97.80.40/3210.97.80.40 – 10.97.80.4010.97.80.40
4210.97.80.41/3210.97.80.41 – 10.97.80.4110.97.80.41
4310.97.80.42/3210.97.80.42 – 10.97.80.4210.97.80.42
4410.97.80.43/3210.97.80.43 – 10.97.80.4310.97.80.43
4510.97.80.44/3210.97.80.44 – 10.97.80.4410.97.80.44
4610.97.80.45/3210.97.80.45 – 10.97.80.4510.97.80.45
4710.97.80.46/3210.97.80.46 – 10.97.80.4610.97.80.46
4810.97.80.47/3210.97.80.47 – 10.97.80.4710.97.80.47
4910.97.80.48/3210.97.80.48 – 10.97.80.4810.97.80.48
5010.97.80.49/3210.97.80.49 – 10.97.80.4910.97.80.49
5110.97.80.50/3210.97.80.50 – 10.97.80.5010.97.80.50
5210.97.80.51/3210.97.80.51 – 10.97.80.5110.97.80.51
5310.97.80.52/3210.97.80.52 – 10.97.80.5210.97.80.52
5410.97.80.53/3210.97.80.53 – 10.97.80.5310.97.80.53
5510.97.80.54/3210.97.80.54 – 10.97.80.5410.97.80.54
5610.97.80.55/3210.97.80.55 – 10.97.80.5510.97.80.55
5710.97.80.56/3210.97.80.56 – 10.97.80.5610.97.80.56
5810.97.80.57/3210.97.80.57 – 10.97.80.5710.97.80.57
5910.97.80.58/3210.97.80.58 – 10.97.80.5810.97.80.58
6010.97.80.59/3210.97.80.59 – 10.97.80.5910.97.80.59
6110.97.80.60/3210.97.80.60 – 10.97.80.6010.97.80.60
6210.97.80.61/3210.97.80.61 – 10.97.80.6110.97.80.61
6310.97.80.62/3210.97.80.62 – 10.97.80.6210.97.80.62
6410.97.80.63/3210.97.80.63 – 10.97.80.6310.97.80.63
6510.97.80.64/3210.97.80.64 – 10.97.80.6410.97.80.64
6610.97.80.65/3210.97.80.65 – 10.97.80.6510.97.80.65
6710.97.80.66/3210.97.80.66 – 10.97.80.6610.97.80.66
6810.97.80.67/3210.97.80.67 – 10.97.80.6710.97.80.67
6910.97.80.68/3210.97.80.68 – 10.97.80.6810.97.80.68
7010.97.80.69/3210.97.80.69 – 10.97.80.6910.97.80.69
7110.97.80.70/3210.97.80.70 – 10.97.80.7010.97.80.70
7210.97.80.71/3210.97.80.71 – 10.97.80.7110.97.80.71
7310.97.80.72/3210.97.80.72 – 10.97.80.7210.97.80.72
7410.97.80.73/3210.97.80.73 – 10.97.80.7310.97.80.73
7510.97.80.74/3210.97.80.74 – 10.97.80.7410.97.80.74
7610.97.80.75/3210.97.80.75 – 10.97.80.7510.97.80.75
7710.97.80.76/3210.97.80.76 – 10.97.80.7610.97.80.76
7810.97.80.77/3210.97.80.77 – 10.97.80.7710.97.80.77
7910.97.80.78/3210.97.80.78 – 10.97.80.7810.97.80.78
8010.97.80.79/3210.97.80.79 – 10.97.80.7910.97.80.79
8110.97.80.80/3210.97.80.80 – 10.97.80.8010.97.80.80
8210.97.80.81/3210.97.80.81 – 10.97.80.8110.97.80.81
8310.97.80.82/3210.97.80.82 – 10.97.80.8210.97.80.82
8410.97.80.83/3210.97.80.83 – 10.97.80.8310.97.80.83
8510.97.80.84/3210.97.80.84 – 10.97.80.8410.97.80.84
8610.97.80.85/3210.97.80.85 – 10.97.80.8510.97.80.85
8710.97.80.86/3210.97.80.86 – 10.97.80.8610.97.80.86
8810.97.80.87/3210.97.80.87 – 10.97.80.8710.97.80.87
8910.97.80.88/3210.97.80.88 – 10.97.80.8810.97.80.88
9010.97.80.89/3210.97.80.89 – 10.97.80.8910.97.80.89
9110.97.80.90/3210.97.80.90 – 10.97.80.9010.97.80.90
9210.97.80.91/3210.97.80.91 – 10.97.80.9110.97.80.91
9310.97.80.92/3210.97.80.92 – 10.97.80.9210.97.80.92
9410.97.80.93/3210.97.80.93 – 10.97.80.9310.97.80.93
9510.97.80.94/3210.97.80.94 – 10.97.80.9410.97.80.94
9610.97.80.95/3210.97.80.95 – 10.97.80.9510.97.80.95
9710.97.80.96/3210.97.80.96 – 10.97.80.9610.97.80.96
9810.97.80.97/3210.97.80.97 – 10.97.80.9710.97.80.97
9910.97.80.98/3210.97.80.98 – 10.97.80.9810.97.80.98
10010.97.80.99/3210.97.80.99 – 10.97.80.9910.97.80.99
10110.97.80.100/3210.97.80.100 – 10.97.80.10010.97.80.100
10210.97.80.101/3210.97.80.101 – 10.97.80.10110.97.80.101
10310.97.80.102/3210.97.80.102 – 10.97.80.10210.97.80.102
10410.97.80.103/3210.97.80.103 – 10.97.80.10310.97.80.103
10510.97.80.104/3210.97.80.104 – 10.97.80.10410.97.80.104
10610.97.80.105/3210.97.80.105 – 10.97.80.10510.97.80.105
10710.97.80.106/3210.97.80.106 – 10.97.80.10610.97.80.106
10810.97.80.107/3210.97.80.107 – 10.97.80.10710.97.80.107
10910.97.80.108/3210.97.80.108 – 10.97.80.10810.97.80.108
11010.97.80.109/3210.97.80.109 – 10.97.80.10910.97.80.109
11110.97.80.110/3210.97.80.110 – 10.97.80.11010.97.80.110
11210.97.80.111/3210.97.80.111 – 10.97.80.11110.97.80.111
11310.97.80.112/3210.97.80.112 – 10.97.80.11210.97.80.112
11410.97.80.113/3210.97.80.113 – 10.97.80.11310.97.80.113
11510.97.80.114/3210.97.80.114 – 10.97.80.11410.97.80.114
11610.97.80.115/3210.97.80.115 – 10.97.80.11510.97.80.115
11710.97.80.116/3210.97.80.116 – 10.97.80.11610.97.80.116
11810.97.80.117/3210.97.80.117 – 10.97.80.11710.97.80.117
11910.97.80.118/3210.97.80.118 – 10.97.80.11810.97.80.118
12010.97.80.119/3210.97.80.119 – 10.97.80.11910.97.80.119
12110.97.80.120/3210.97.80.120 – 10.97.80.12010.97.80.120
12210.97.80.121/3210.97.80.121 – 10.97.80.12110.97.80.121
12310.97.80.122/3210.97.80.122 – 10.97.80.12210.97.80.122
12410.97.80.123/3210.97.80.123 – 10.97.80.12310.97.80.123
12510.97.80.124/3210.97.80.124 – 10.97.80.12410.97.80.124
12610.97.80.125/3210.97.80.125 – 10.97.80.12510.97.80.125
12710.97.80.126/3210.97.80.126 – 10.97.80.12610.97.80.126
12810.97.80.127/3210.97.80.127 – 10.97.80.12710.97.80.127
12910.97.80.128/3210.97.80.128 – 10.97.80.12810.97.80.128
13010.97.80.129/3210.97.80.129 – 10.97.80.12910.97.80.129
13110.97.80.130/3210.97.80.130 – 10.97.80.13010.97.80.130
13210.97.80.131/3210.97.80.131 – 10.97.80.13110.97.80.131
13310.97.80.132/3210.97.80.132 – 10.97.80.13210.97.80.132
13410.97.80.133/3210.97.80.133 – 10.97.80.13310.97.80.133
13510.97.80.134/3210.97.80.134 – 10.97.80.13410.97.80.134
13610.97.80.135/3210.97.80.135 – 10.97.80.13510.97.80.135
13710.97.80.136/3210.97.80.136 – 10.97.80.13610.97.80.136
13810.97.80.137/3210.97.80.137 – 10.97.80.13710.97.80.137
13910.97.80.138/3210.97.80.138 – 10.97.80.13810.97.80.138
14010.97.80.139/3210.97.80.139 – 10.97.80.13910.97.80.139
14110.97.80.140/3210.97.80.140 – 10.97.80.14010.97.80.140
14210.97.80.141/3210.97.80.141 – 10.97.80.14110.97.80.141
14310.97.80.142/3210.97.80.142 – 10.97.80.14210.97.80.142
14410.97.80.143/3210.97.80.143 – 10.97.80.14310.97.80.143
14510.97.80.144/3210.97.80.144 – 10.97.80.14410.97.80.144
14610.97.80.145/3210.97.80.145 – 10.97.80.14510.97.80.145
14710.97.80.146/3210.97.80.146 – 10.97.80.14610.97.80.146
14810.97.80.147/3210.97.80.147 – 10.97.80.14710.97.80.147
14910.97.80.148/3210.97.80.148 – 10.97.80.14810.97.80.148
15010.97.80.149/3210.97.80.149 – 10.97.80.14910.97.80.149
15110.97.80.150/3210.97.80.150 – 10.97.80.15010.97.80.150
15210.97.80.151/3210.97.80.151 – 10.97.80.15110.97.80.151
15310.97.80.152/3210.97.80.152 – 10.97.80.15210.97.80.152
15410.97.80.153/3210.97.80.153 – 10.97.80.15310.97.80.153
15510.97.80.154/3210.97.80.154 – 10.97.80.15410.97.80.154
15610.97.80.155/3210.97.80.155 – 10.97.80.15510.97.80.155
15710.97.80.156/3210.97.80.156 – 10.97.80.15610.97.80.156
15810.97.80.157/3210.97.80.157 – 10.97.80.15710.97.80.157
15910.97.80.158/3210.97.80.158 – 10.97.80.15810.97.80.158
16010.97.80.159/3210.97.80.159 – 10.97.80.15910.97.80.159
16110.97.80.160/3210.97.80.160 – 10.97.80.16010.97.80.160
16210.97.80.161/3210.97.80.161 – 10.97.80.16110.97.80.161
16310.97.80.162/3210.97.80.162 – 10.97.80.16210.97.80.162
16410.97.80.163/3210.97.80.163 – 10.97.80.16310.97.80.163
16510.97.80.164/3210.97.80.164 – 10.97.80.16410.97.80.164
16610.97.80.165/3210.97.80.165 – 10.97.80.16510.97.80.165
16710.97.80.166/3210.97.80.166 – 10.97.80.16610.97.80.166
16810.97.80.167/3210.97.80.167 – 10.97.80.16710.97.80.167
16910.97.80.168/3210.97.80.168 – 10.97.80.16810.97.80.168
17010.97.80.169/3210.97.80.169 – 10.97.80.16910.97.80.169
17110.97.80.170/3210.97.80.170 – 10.97.80.17010.97.80.170
17210.97.80.171/3210.97.80.171 – 10.97.80.17110.97.80.171
17310.97.80.172/3210.97.80.172 – 10.97.80.17210.97.80.172
17410.97.80.173/3210.97.80.173 – 10.97.80.17310.97.80.173
17510.97.80.174/3210.97.80.174 – 10.97.80.17410.97.80.174
17610.97.80.175/3210.97.80.175 – 10.97.80.17510.97.80.175
17710.97.80.176/3210.97.80.176 – 10.97.80.17610.97.80.176
17810.97.80.177/3210.97.80.177 – 10.97.80.17710.97.80.177
17910.97.80.178/3210.97.80.178 – 10.97.80.17810.97.80.178
18010.97.80.179/3210.97.80.179 – 10.97.80.17910.97.80.179
18110.97.80.180/3210.97.80.180 – 10.97.80.18010.97.80.180
18210.97.80.181/3210.97.80.181 – 10.97.80.18110.97.80.181
18310.97.80.182/3210.97.80.182 – 10.97.80.18210.97.80.182
18410.97.80.183/3210.97.80.183 – 10.97.80.18310.97.80.183
18510.97.80.184/3210.97.80.184 – 10.97.80.18410.97.80.184
18610.97.80.185/3210.97.80.185 – 10.97.80.18510.97.80.185
18710.97.80.186/3210.97.80.186 – 10.97.80.18610.97.80.186
18810.97.80.187/3210.97.80.187 – 10.97.80.18710.97.80.187
18910.97.80.188/3210.97.80.188 – 10.97.80.18810.97.80.188
19010.97.80.189/3210.97.80.189 – 10.97.80.18910.97.80.189
19110.97.80.190/3210.97.80.190 – 10.97.80.19010.97.80.190
19210.97.80.191/3210.97.80.191 – 10.97.80.19110.97.80.191
19310.97.80.192/3210.97.80.192 – 10.97.80.19210.97.80.192
19410.97.80.193/3210.97.80.193 – 10.97.80.19310.97.80.193
19510.97.80.194/3210.97.80.194 – 10.97.80.19410.97.80.194
19610.97.80.195/3210.97.80.195 – 10.97.80.19510.97.80.195
19710.97.80.196/3210.97.80.196 – 10.97.80.19610.97.80.196
19810.97.80.197/3210.97.80.197 – 10.97.80.19710.97.80.197
19910.97.80.198/3210.97.80.198 – 10.97.80.19810.97.80.198
20010.97.80.199/3210.97.80.199 – 10.97.80.19910.97.80.199
20110.97.80.200/3210.97.80.200 – 10.97.80.20010.97.80.200
20210.97.80.201/3210.97.80.201 – 10.97.80.20110.97.80.201
20310.97.80.202/3210.97.80.202 – 10.97.80.20210.97.80.202
20410.97.80.203/3210.97.80.203 – 10.97.80.20310.97.80.203
20510.97.80.204/3210.97.80.204 – 10.97.80.20410.97.80.204
20610.97.80.205/3210.97.80.205 – 10.97.80.20510.97.80.205
20710.97.80.206/3210.97.80.206 – 10.97.80.20610.97.80.206
20810.97.80.207/3210.97.80.207 – 10.97.80.20710.97.80.207
20910.97.80.208/3210.97.80.208 – 10.97.80.20810.97.80.208
21010.97.80.209/3210.97.80.209 – 10.97.80.20910.97.80.209
21110.97.80.210/3210.97.80.210 – 10.97.80.21010.97.80.210
21210.97.80.211/3210.97.80.211 – 10.97.80.21110.97.80.211
21310.97.80.212/3210.97.80.212 – 10.97.80.21210.97.80.212
21410.97.80.213/3210.97.80.213 – 10.97.80.21310.97.80.213
21510.97.80.214/3210.97.80.214 – 10.97.80.21410.97.80.214
21610.97.80.215/3210.97.80.215 – 10.97.80.21510.97.80.215
21710.97.80.216/3210.97.80.216 – 10.97.80.21610.97.80.216
21810.97.80.217/3210.97.80.217 – 10.97.80.21710.97.80.217
21910.97.80.218/3210.97.80.218 – 10.97.80.21810.97.80.218
22010.97.80.219/3210.97.80.219 – 10.97.80.21910.97.80.219
22110.97.80.220/3210.97.80.220 – 10.97.80.22010.97.80.220
22210.97.80.221/3210.97.80.221 – 10.97.80.22110.97.80.221
22310.97.80.222/3210.97.80.222 – 10.97.80.22210.97.80.222
22410.97.80.223/3210.97.80.223 – 10.97.80.22310.97.80.223
22510.97.80.224/3210.97.80.224 – 10.97.80.22410.97.80.224
22610.97.80.225/3210.97.80.225 – 10.97.80.22510.97.80.225
22710.97.80.226/3210.97.80.226 – 10.97.80.22610.97.80.226
22810.97.80.227/3210.97.80.227 – 10.97.80.22710.97.80.227
22910.97.80.228/3210.97.80.228 – 10.97.80.22810.97.80.228
23010.97.80.229/3210.97.80.229 – 10.97.80.22910.97.80.229
23110.97.80.230/3210.97.80.230 – 10.97.80.23010.97.80.230
23210.97.80.231/3210.97.80.231 – 10.97.80.23110.97.80.231
23310.97.80.232/3210.97.80.232 – 10.97.80.23210.97.80.232
23410.97.80.233/3210.97.80.233 – 10.97.80.23310.97.80.233
23510.97.80.234/3210.97.80.234 – 10.97.80.23410.97.80.234
23610.97.80.235/3210.97.80.235 – 10.97.80.23510.97.80.235
23710.97.80.236/3210.97.80.236 – 10.97.80.23610.97.80.236
23810.97.80.237/3210.97.80.237 – 10.97.80.23710.97.80.237
23910.97.80.238/3210.97.80.238 – 10.97.80.23810.97.80.238
24010.97.80.239/3210.97.80.239 – 10.97.80.23910.97.80.239
24110.97.80.240/3210.97.80.240 – 10.97.80.24010.97.80.240
24210.97.80.241/3210.97.80.241 – 10.97.80.24110.97.80.241
24310.97.80.242/3210.97.80.242 – 10.97.80.24210.97.80.242
24410.97.80.243/3210.97.80.243 – 10.97.80.24310.97.80.243
24510.97.80.244/3210.97.80.244 – 10.97.80.24410.97.80.244
24610.97.80.245/3210.97.80.245 – 10.97.80.24510.97.80.245
24710.97.80.246/3210.97.80.246 – 10.97.80.24610.97.80.246
24810.97.80.247/3210.97.80.247 – 10.97.80.24710.97.80.247
24910.97.80.248/3210.97.80.248 – 10.97.80.24810.97.80.248
25010.97.80.249/3210.97.80.249 – 10.97.80.24910.97.80.249
25110.97.80.250/3210.97.80.250 – 10.97.80.25010.97.80.250
25210.97.80.251/3210.97.80.251 – 10.97.80.25110.97.80.251
25310.97.80.252/3210.97.80.252 – 10.97.80.25210.97.80.252
25410.97.80.253/3210.97.80.253 – 10.97.80.25310.97.80.253
25510.97.80.254/3210.97.80.254 – 10.97.80.25410.97.80.254
25610.97.80.255/3210.97.80.255 – 10.97.80.25510.97.80.255
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 →