The socket type changes which measurement reference point is used and which formula applies.
The spacer length depends on which module is fitted. You can select more than one — a result card will appear for each.
Measure from the Epicondylus Medialis to the distal part of the stump on the affected arm.

Measure from the Epicondylus Medialis to the wrist on the non-affected arm.

For each selected module, the calculator applies its own offset and rounds to the nearest available size.
Recommended spacer length (mm) for each module by ΔL = L5 − L4. Provisional — pending final approval.
| ΔL = L5 − L4 (mm) | Ball | Bike | Twin | Pinch / Hold |
|---|---|---|---|---|
| 01 – 61 | NA | NA | NA | NA |
| 62 | NA | NA | 16 | NA |
| 63 | NA | NA | 16 | NA |
| 64 | NA | NA | 16 | NA |
| 65 – 71 | NA | NA | 16 | 16 |
| 72 | NA | NA | 20 | 16 |
| 73 | NA | 16 | 20 | 16 |
| 74 | NA | 16 | 20 | 16 |
| 75 | NA | 16 | 20 | 20 |
| 76 | NA | 16 | 25 | 20 |
| 77 | NA | 16 | 25 | 20 |
| 78 | NA | 16 | 25 | 20 |
| 79 | 16 | 16 | 25 | 25 |
| 80 | 16 | 16 | 25 | 25 |
| 81 | 16 | 16 | 30 | 25 |
| 82 | 16 | 16 | 30 | 25 |
| 83 | 16 | 20 | 30 | 25 |
| 84 | 16 | 20 | 30 | 30 |
| 85 | 16 | 20 | 30 | 30 |
| 86 | 16 | 20 | 35 | 30 |
| 87 | 16 | 25 | 35 | 30 |
| 88 | 16 | 25 | 35 | 30 |
| 89 | 20 | 25 | 35 | 35 |
| 90 | 20 | 25 | 35 | 35 |
| 91 | 20 | 25 | 40 | 35 |
| 92 | 20 | 30 | 40 | 35 |
| 93 | 25 | 30 | 40 | 35 |
| 94 | 25 | 30 | 40 | 40 |
| 95 | 25 | 30 | 40 | 40 |
| 96 | 25 | 30 | 45 | 40 |
| 97 | 25 | 35 | 45 | 40 |
| 98 | 30 | 35 | 45 | 40 |
| 99 | 30 | 35 | 45 | 45 |
| 100 | 30 | 35 | 45 | 45 |
| 101 | 30 | 35 | 50 | 45 |
| 102 | 30 | 40 | 50 | 45 |
| 103 | 35 | 40 | 50 | 45 |
| 104 | 35 | 40 | 50 | 50 |
| 105 | 35 | 40 | 50 | 50 |
| 106 | 35 | 40 | 55 | 50 |
| 107 | 35 | 45 | 55 | 50 |
| 108 | 40 | 45 | 55 | 50 |
| 109 | 40 | 45 | 55 | 55 |
| 110 | 40 | 45 | 55 | 55 |
| 111 | 40 | 45 | 60 | 55 |
| 112 | 40 | 50 | 60 | 55 |
| 113 | 45 | 50 | 60 | 55 |
| 114 | 45 | 50 | 60 | 60 |
| 115 | 45 | 50 | 60 | 60 |
| 116 | 45 | 50 | 65 | 60 |
| 117 | 45 | 55 | 65 | 60 |
| 118 | 50 | 55 | 65 | 60 |
| 119 | 50 | 55 | 65 | 65 |
| 120 | 50 | 55 | 65 | 65 |
| 121 | 50 | 55 | 70 | 65 |
| 122 | 50 | 60 | 70 | 65 |
| 123 | 55 | 60 | 70 | 65 |
| 124 | 55 | 60 | 70 | 70 |
| 125 | 55 | 60 | 70 | 70 |
| 126 | 55 | 60 | 75 | 70 |
| 127 | 55 | 65 | 75 | 70 |
| 128 | 60 | 65 | 75 | 70 |
| 129 | 60 | 65 | 75 | 75 |
| 130 | 60 | 65 | 75 | 75 |
| 131 | 60 | 65 | 80 | 75 |
| 132 | 60 | 70 | 80 | 75 |
| 133 | 65 | 70 | 80 | 75 |
| 134 | 65 | 70 | 80 | 80 |
| 135 | 65 | 70 | 80 | 80 |
| 136 | 65 | 70 | 85 | 80 |
| 137 | 65 | 75 | 85 | 80 |
| 138 | 70 | 75 | 85 | 80 |
| 139 | 70 | 75 | 85 | 85 |
| 140 | 70 | 75 | 85 | 85 |
| 141 | 70 | 75 | 90 | 85 |
| 142 | 70 | 80 | 90 | 85 |
| 143 | 75 | 80 | 90 | 85 |
| 144 | 75 | 80 | 90 | 90 |
| 145 | 75 | 80 | 90 | 90 |
| 146 | 75 | 80 | 95 | 90 |
| 147 | 75 | 85 | 95 | 90 |
| 148 | 80 | 85 | 95 | 90 |
| 149 | 80 | 85 | 95 | 95 |
| 150 | 80 | 85 | 95 | 95 |
| 151 | 80 | 85 | 100 | 95 |
| 152 | 80 | 90 | 100 | 95 |
| 153 | 85 | 90 | 100 | 95 |
| 154 | 85 | 90 | 100 | 100 |
| 155 | 85 | 90 | 100 | 100 |
| 156 | 85 | 90 | 105 | 100 |
| 157 | 85 | 95 | 105 | 100 |
| 158 | 90 | 95 | 105 | 100 |
| 159 | 90 | 95 | 105 | 105 |
| 160 | 90 | 95 | 105 | 105 |
| 161 | 90 | 95 | 110 | 105 |
| 162 | 90 | 100 | 110 | 105 |
| 163 | 95 | 100 | 110 | 105 |
| 164 | 95 | 100 | 110 | 110 |
| 165 | 95 | 100 | 110 | 110 |
| 166 | 95 | 100 | 115 | 110 |
| 167 | 95 | 105 | 115 | 110 |
| 168 | 100 | 105 | 115 | 110 |
| 169 | 100 | 105 | 115 | 115 |
| 170 | 100 | 105 | 115 | 115 |
| 171 | 100 | 105 | 120 | 115 |
| 172 | 100 | 110 | 120 | 115 |
| 173 | 105 | 110 | 120 | 115 |
| 174 | 105 | 110 | 120 | 120 |
| 175 | 105 | 110 | 120 | 120 |
| 176 | 105 | 110 | 125 | 120 |
| 177 | 105 | 115 | 125 | 120 |
| 178 | 110 | 115 | 125 | 120 |
| 179 | 110 | 115 | 125 | 125 |
| 180 | 110 | 115 | 125 | 125 |
| 181 | 110 | 115 | 130 | 125 |
| 182 | 110 | 120 | 130 | 125 |
| 183 | 115 | 120 | 130 | 125 |
| 184 | 115 | 120 | 130 | 130 |
| 185 | 115 | 120 | 130 | 130 |
| 186 | 115 | 120 | 135 | 130 |
| 187 | 115 | 125 | 135 | 130 |
| 188 | 120 | 125 | 135 | 130 |
| 189 | 120 | 125 | 135 | 135 |
| 190 | 120 | 125 | 135 | 135 |
| 191 | 120 | 125 | 140 | 135 |
| 192 | 120 | 130 | 140 | 135 |
| 193 | 125 | 130 | 140 | 135 |
| 194 | 125 | 130 | 140 | 140 |
| 195 | 125 | 130 | 140 | 140 |
| 196 | 125 | 130 | 145 | 140 |
| 197 | 125 | 135 | 145 | 140 |
| 198 | 130 | 135 | 145 | 140 |
| 199 | 130 | 135 | 145 | 145 |
| 200 | 130 | 135 | 145 | 145 |
| 201 | 130 | 135 | 150 | 145 |
| 202 | 130 | 140 | 150 | 145 |
| 203 | 135 | 140 | 150 | 145 |
| 204 | 135 | 140 | 150 | 150 |
| 205 | 135 | 140 | 150 | 150 |
| 206 | 135 | 140 | 155 | 150 |
| 207 | 135 | 145 | 155 | 150 |
| 208 | 140 | 145 | 155 | 150 |
| 209 | 140 | 145 | 155 | 155 |
| 210 | 140 | 145 | 155 | 155 |
| 211 | 140 | 145 | 160 | 155 |
| 212 | 140 | 150 | 160 | 155 |
| 213 | 145 | 150 | 160 | 155 |
| 214 | 145 | 150 | 160 | 160 |
| 215 | 145 | 150 | 160 | 160 |
| 216 | 145 | 150 | 165 | 160 |
| 217 | 145 | 155 | 165 | 160 |
| 218 | 150 | 155 | 165 | 160 |
| 219 | 150 | 155 | 165 | 165 |
| 220 | 150 | 155 | 165 | 165 |
| 221 | 150 | 155 | 170 | 165 |
| 222 | 150 | 160 | 170 | 165 |
| 223 | 155 | 160 | 170 | 165 |
| 224 | 155 | 160 | 170 | 170 |
| 225 | 155 | 160 | 170 | 170 |
| 226 | 155 | 160 | 175 | 170 |
| 227 | 155 | 165 | 175 | 170 |
| 228 | 160 | 165 | 175 | 170 |
| 229 | 160 | 165 | 175 | 175 |
| 230 | 160 | 165 | 175 | 175 |
| 231 | 160 | 165 | 180 | 175 |
| 232 | 160 | 170 | 180 | 175 |
| 233 | 165 | 170 | 180 | 175 |
| 234 | 165 | 170 | 180 | 180 |
| 235 | 165 | 170 | 180 | 180 |
| 236 | 165 | 170 | 185 | 180 |
| 237 | 165 | 175 | 185 | 180 |
| 238 | 170 | 175 | 185 | 180 |
| 239 | 170 | 175 | 185 | 185 |
| 240 | 170 | 175 | 185 | 185 |
| 241 | 170 | 175 | 190 | 185 |
| 242 | 170 | 180 | 190 | 185 |
| 243 | 175 | 180 | 190 | 185 |
| 244 | 175 | 180 | 190 | 190 |
| 245 | 175 | 180 | 190 | 190 |
| 246 | 175 | 180 | 195 | 190 |
| 247 | 175 | 185 | 195 | 190 |
| 248 | 180 | 185 | 195 | 190 |
| 249 | 180 | 185 | 195 | 195 |
| 250 | 180 | 185 | 195 | 195 |
| 251 | 180 | 185 | 195 | 195 |
| 252 | 180 | 190 | 195 | 195 |
| 253 | 185 | 190 | 195 | 195 |
| 254 | 185 | 190 | 195 | 195 |
| 255 | 185 | 190 | 195 | 195 |
| 256 | 185 | 190 | 195 | 195 |
| 257 | 185 | 195 | 195 | 195 |
| 258 | 190 | 195 | 195 | 195 |
| 259 | 190 | 195 | 195 | 195 |
| 260 | 190 | 195 | 195 | 195 |
| 261 | 190 | 195 | 195 | 195 |
| 262 | 190 | 195 | 195 | 195 |
| >262 | 195 | 195 | 195 | 195 |
| Socket type | — |
|---|---|
| L4 | — |
| L5 | — |
| Module | Spacer | Offset | Exact | Formula |
|---|