CalculatorsBlood sugarGMI calculator
GMI calculator
Turn the mean glucose from your sensor into a GMI, and see how far it sits from your lab A1C.
Glucose Management IndicatorExample
6.7% GMI
Above typical
Above what's typical without diabetes, and under the 7% many adults with diabetes aim for.
- GMI
- 6.7%
See the working
GMI = 3.31 + 0.02392 × mean glucose3.31 + 0.02392 × 140 = 6.66%What GMI is
The Glucose Management Indicator estimates what your A1C would be from continuous glucose monitor data alone. It replaced the older "estimated A1C" label, because the two don't always match, and people were confused when they didn't.
It needs at least 14 days of sensor data to mean much, and the more of those days your sensor was actually running, the better.
When GMI and your A1C disagree
They can, and a gap of half a point or more isn't unusual. A steady gap tells you something about you: how long your red blood cells live, or how your body glycates.
Knowing your own gap is useful. It helps you and your doctor judge what the next A1C really says.
Sensor average to GMI chart
The GMI each mean sensor glucose works out to (Bergenstal 2018). It estimates, it doesn't replace, a lab A1C.
| Mean glucose | In mmol/L | GMI |
|---|---|---|
| 70 mg/dL | 3.9 | 5.0 % GMI |
| 71 mg/dL | 3.9 | 5.0 % GMI |
| 72 mg/dL | 4.0 | 5.0 % GMI |
| 73 mg/dL | 4.1 | 5.1 % GMI |
| 74 mg/dL | 4.1 | 5.1 % GMI |
| 75 mg/dL | 4.2 | 5.1 % GMI |
| 76 mg/dL | 4.2 | 5.1 % GMI |
| 77 mg/dL | 4.3 | 5.2 % GMI |
| 78 mg/dL | 4.3 | 5.2 % GMI |
| 79 mg/dL | 4.4 | 5.2 % GMI |
| 80 mg/dL | 4.4 | 5.2 % GMI |
| 81 mg/dL | 4.5 | 5.2 % GMI |
| 82 mg/dL | 4.6 | 5.3 % GMI |
| 83 mg/dL | 4.6 | 5.3 % GMI |
| 84 mg/dL | 4.7 | 5.3 % GMI |
| 85 mg/dL | 4.7 | 5.3 % GMI |
| 86 mg/dL | 4.8 | 5.4 % GMI |
| 87 mg/dL | 4.8 | 5.4 % GMI |
| 88 mg/dL | 4.9 | 5.4 % GMI |
| 89 mg/dL | 4.9 | 5.4 % GMI |
| 90 mg/dL | 5.0 | 5.5 % GMI |
| 91 mg/dL | 5.1 | 5.5 % GMI |
| 92 mg/dL | 5.1 | 5.5 % GMI |
| 93 mg/dL | 5.2 | 5.5 % GMI |
| 94 mg/dL | 5.2 | 5.6 % GMI |
| 95 mg/dL | 5.3 | 5.6 % GMI |
| 96 mg/dL | 5.3 | 5.6 % GMI |
| 97 mg/dL | 5.4 | 5.6 % GMI |
| 98 mg/dL | 5.4 | 5.7 % GMI |
| 99 mg/dL | 5.5 | 5.7 % GMI |
| 100 mg/dL | 5.6 | 5.7 % GMI |
| 101 mg/dL | 5.6 | 5.7 % GMI |
| 102 mg/dL | 5.7 | 5.7 % GMI |
| 103 mg/dL | 5.7 | 5.8 % GMI |
| 104 mg/dL | 5.8 | 5.8 % GMI |
| 105 mg/dL | 5.8 | 5.8 % GMI |
| 106 mg/dL | 5.9 | 5.8 % GMI |
| 107 mg/dL | 5.9 | 5.9 % GMI |
| 108 mg/dL | 6.0 | 5.9 % GMI |
| 109 mg/dL | 6.1 | 5.9 % GMI |
| 110 mg/dL | 6.1 | 5.9 % GMI |
| 111 mg/dL | 6.2 | 6.0 % GMI |
| 112 mg/dL | 6.2 | 6.0 % GMI |
| 113 mg/dL | 6.3 | 6.0 % GMI |
| 114 mg/dL | 6.3 | 6.0 % GMI |
| 115 mg/dL | 6.4 | 6.1 % GMI |
| 116 mg/dL | 6.4 | 6.1 % GMI |
| 117 mg/dL | 6.5 | 6.1 % GMI |
| 118 mg/dL | 6.5 | 6.1 % GMI |
| 119 mg/dL | 6.6 | 6.2 % GMI |
| 120 mg/dL | 6.7 | 6.2 % GMI |
| 121 mg/dL | 6.7 | 6.2 % GMI |
| 122 mg/dL | 6.8 | 6.2 % GMI |
| 123 mg/dL | 6.8 | 6.3 % GMI |
| 124 mg/dL | 6.9 | 6.3 % GMI |
| 125 mg/dL | 6.9 | 6.3 % GMI |
| 126 mg/dL | 7.0 | 6.3 % GMI |
| 127 mg/dL | 7.0 | 6.3 % GMI |
| 128 mg/dL | 7.1 | 6.4 % GMI |
| 129 mg/dL | 7.2 | 6.4 % GMI |
| 130 mg/dL | 7.2 | 6.4 % GMI |
| 131 mg/dL | 7.3 | 6.4 % GMI |
| 132 mg/dL | 7.3 | 6.5 % GMI |
| 133 mg/dL | 7.4 | 6.5 % GMI |
| 134 mg/dL | 7.4 | 6.5 % GMI |
| 135 mg/dL | 7.5 | 6.5 % GMI |
| 136 mg/dL | 7.5 | 6.6 % GMI |
| 137 mg/dL | 7.6 | 6.6 % GMI |
| 138 mg/dL | 7.7 | 6.6 % GMI |
| 139 mg/dL | 7.7 | 6.6 % GMI |
| 140 mg/dL | 7.8 | 6.7 % GMI |
| 141 mg/dL | 7.8 | 6.7 % GMI |
| 142 mg/dL | 7.9 | 6.7 % GMI |
| 143 mg/dL | 7.9 | 6.7 % GMI |
| 144 mg/dL | 8.0 | 6.8 % GMI |
| 145 mg/dL | 8.0 | 6.8 % GMI |
| 146 mg/dL | 8.1 | 6.8 % GMI |
| 147 mg/dL | 8.2 | 6.8 % GMI |
| 148 mg/dL | 8.2 | 6.9 % GMI |
| 149 mg/dL | 8.3 | 6.9 % GMI |
| 150 mg/dL | 8.3 | 6.9 % GMI |
| 151 mg/dL | 8.4 | 6.9 % GMI |
| 152 mg/dL | 8.4 | 6.9 % GMI |
| 153 mg/dL | 8.5 | 7.0 % GMI |
| 154 mg/dL | 8.5 | 7.0 % GMI |
| 155 mg/dL | 8.6 | 7.0 % GMI |
| 156 mg/dL | 8.7 | 7.0 % GMI |
| 157 mg/dL | 8.7 | 7.1 % GMI |
| 158 mg/dL | 8.8 | 7.1 % GMI |
| 159 mg/dL | 8.8 | 7.1 % GMI |
| 160 mg/dL | 8.9 | 7.1 % GMI |
| 161 mg/dL | 8.9 | 7.2 % GMI |
| 162 mg/dL | 9.0 | 7.2 % GMI |
| 163 mg/dL | 9.0 | 7.2 % GMI |
| 164 mg/dL | 9.1 | 7.2 % GMI |
| 165 mg/dL | 9.2 | 7.3 % GMI |
| 166 mg/dL | 9.2 | 7.3 % GMI |
| 167 mg/dL | 9.3 | 7.3 % GMI |
| 168 mg/dL | 9.3 | 7.3 % GMI |
| 169 mg/dL | 9.4 | 7.4 % GMI |
| 170 mg/dL | 9.4 | 7.4 % GMI |
| 171 mg/dL | 9.5 | 7.4 % GMI |
| 172 mg/dL | 9.5 | 7.4 % GMI |
| 173 mg/dL | 9.6 | 7.4 % GMI |
| 174 mg/dL | 9.7 | 7.5 % GMI |
| 175 mg/dL | 9.7 | 7.5 % GMI |
| 176 mg/dL | 9.8 | 7.5 % GMI |
| 177 mg/dL | 9.8 | 7.5 % GMI |
| 178 mg/dL | 9.9 | 7.6 % GMI |
| 179 mg/dL | 9.9 | 7.6 % GMI |
| 180 mg/dL | 10.0 | 7.6 % GMI |
| 181 mg/dL | 10.0 | 7.6 % GMI |
| 182 mg/dL | 10.1 | 7.7 % GMI |
| 183 mg/dL | 10.2 | 7.7 % GMI |
| 184 mg/dL | 10.2 | 7.7 % GMI |
| 185 mg/dL | 10.3 | 7.7 % GMI |
| 186 mg/dL | 10.3 | 7.8 % GMI |
| 187 mg/dL | 10.4 | 7.8 % GMI |
| 188 mg/dL | 10.4 | 7.8 % GMI |
| 189 mg/dL | 10.5 | 7.8 % GMI |
| 190 mg/dL | 10.5 | 7.9 % GMI |
| 191 mg/dL | 10.6 | 7.9 % GMI |
| 192 mg/dL | 10.7 | 7.9 % GMI |
| 193 mg/dL | 10.7 | 7.9 % GMI |
| 194 mg/dL | 10.8 | 8.0 % GMI |
| 195 mg/dL | 10.8 | 8.0 % GMI |
| 196 mg/dL | 10.9 | 8.0 % GMI |
| 197 mg/dL | 10.9 | 8.0 % GMI |
| 198 mg/dL | 11.0 | 8.0 % GMI |
| 199 mg/dL | 11.0 | 8.1 % GMI |
| 200 mg/dL | 11.1 | 8.1 % GMI |
| 201 mg/dL | 11.2 | 8.1 % GMI |
| 202 mg/dL | 11.2 | 8.1 % GMI |
| 203 mg/dL | 11.3 | 8.2 % GMI |
| 204 mg/dL | 11.3 | 8.2 % GMI |
| 205 mg/dL | 11.4 | 8.2 % GMI |
| 206 mg/dL | 11.4 | 8.2 % GMI |
| 207 mg/dL | 11.5 | 8.3 % GMI |
| 208 mg/dL | 11.5 | 8.3 % GMI |
| 209 mg/dL | 11.6 | 8.3 % GMI |
| 210 mg/dL | 11.7 | 8.3 % GMI |
| 211 mg/dL | 11.7 | 8.4 % GMI |
| 212 mg/dL | 11.8 | 8.4 % GMI |
| 213 mg/dL | 11.8 | 8.4 % GMI |
| 214 mg/dL | 11.9 | 8.4 % GMI |
| 215 mg/dL | 11.9 | 8.5 % GMI |
| 216 mg/dL | 12.0 | 8.5 % GMI |
| 217 mg/dL | 12.0 | 8.5 % GMI |
| 218 mg/dL | 12.1 | 8.5 % GMI |
| 219 mg/dL | 12.2 | 8.5 % GMI |
| 220 mg/dL | 12.2 | 8.6 % GMI |
| 221 mg/dL | 12.3 | 8.6 % GMI |
| 222 mg/dL | 12.3 | 8.6 % GMI |
| 223 mg/dL | 12.4 | 8.6 % GMI |
| 224 mg/dL | 12.4 | 8.7 % GMI |
| 225 mg/dL | 12.5 | 8.7 % GMI |
| 226 mg/dL | 12.5 | 8.7 % GMI |
| 227 mg/dL | 12.6 | 8.7 % GMI |
| 228 mg/dL | 12.7 | 8.8 % GMI |
| 229 mg/dL | 12.7 | 8.8 % GMI |
| 230 mg/dL | 12.8 | 8.8 % GMI |
| 231 mg/dL | 12.8 | 8.8 % GMI |
| 232 mg/dL | 12.9 | 8.9 % GMI |
| 233 mg/dL | 12.9 | 8.9 % GMI |
| 234 mg/dL | 13.0 | 8.9 % GMI |
| 235 mg/dL | 13.0 | 8.9 % GMI |
| 236 mg/dL | 13.1 | 9.0 % GMI |
| 237 mg/dL | 13.2 | 9.0 % GMI |
| 238 mg/dL | 13.2 | 9.0 % GMI |
| 239 mg/dL | 13.3 | 9.0 % GMI |
| 240 mg/dL | 13.3 | 9.1 % GMI |
| 241 mg/dL | 13.4 | 9.1 % GMI |
| 242 mg/dL | 13.4 | 9.1 % GMI |
| 243 mg/dL | 13.5 | 9.1 % GMI |
| 244 mg/dL | 13.5 | 9.1 % GMI |
| 245 mg/dL | 13.6 | 9.2 % GMI |
| 246 mg/dL | 13.7 | 9.2 % GMI |
| 247 mg/dL | 13.7 | 9.2 % GMI |
| 248 mg/dL | 13.8 | 9.2 % GMI |
| 249 mg/dL | 13.8 | 9.3 % GMI |
| 250 mg/dL | 13.9 | 9.3 % GMI |
| 251 mg/dL | 13.9 | 9.3 % GMI |
| 252 mg/dL | 14.0 | 9.3 % GMI |
| 253 mg/dL | 14.0 | 9.4 % GMI |
| 254 mg/dL | 14.1 | 9.4 % GMI |
| 255 mg/dL | 14.2 | 9.4 % GMI |
| 256 mg/dL | 14.2 | 9.4 % GMI |
| 257 mg/dL | 14.3 | 9.5 % GMI |
| 258 mg/dL | 14.3 | 9.5 % GMI |
| 259 mg/dL | 14.4 | 9.5 % GMI |
| 260 mg/dL | 14.4 | 9.5 % GMI |
| 261 mg/dL | 14.5 | 9.6 % GMI |
| 262 mg/dL | 14.5 | 9.6 % GMI |
| 263 mg/dL | 14.6 | 9.6 % GMI |
| 264 mg/dL | 14.7 | 9.6 % GMI |
| 265 mg/dL | 14.7 | 9.6 % GMI |
| 266 mg/dL | 14.8 | 9.7 % GMI |
| 267 mg/dL | 14.8 | 9.7 % GMI |
| 268 mg/dL | 14.9 | 9.7 % GMI |
| 269 mg/dL | 14.9 | 9.7 % GMI |
| 270 mg/dL | 15.0 | 9.8 % GMI |
| 271 mg/dL | 15.0 | 9.8 % GMI |
| 272 mg/dL | 15.1 | 9.8 % GMI |
| 273 mg/dL | 15.2 | 9.8 % GMI |
| 274 mg/dL | 15.2 | 9.9 % GMI |
| 275 mg/dL | 15.3 | 9.9 % GMI |
| 276 mg/dL | 15.3 | 9.9 % GMI |
| 277 mg/dL | 15.4 | 9.9 % GMI |
| 278 mg/dL | 15.4 | 10.0 % GMI |
| 279 mg/dL | 15.5 | 10.0 % GMI |
| 280 mg/dL | 15.5 | 10.0 % GMI |
| 281 mg/dL | 15.6 | 10.0 % GMI |
| 282 mg/dL | 15.7 | 10.1 % GMI |
| 283 mg/dL | 15.7 | 10.1 % GMI |
| 284 mg/dL | 15.8 | 10.1 % GMI |
| 285 mg/dL | 15.8 | 10.1 % GMI |
| 286 mg/dL | 15.9 | 10.2 % GMI |
| 287 mg/dL | 15.9 | 10.2 % GMI |
| 288 mg/dL | 16.0 | 10.2 % GMI |
| 289 mg/dL | 16.0 | 10.2 % GMI |
| 290 mg/dL | 16.1 | 10.2 % GMI |
| 291 mg/dL | 16.2 | 10.3 % GMI |
| 292 mg/dL | 16.2 | 10.3 % GMI |
| 293 mg/dL | 16.3 | 10.3 % GMI |
| 294 mg/dL | 16.3 | 10.3 % GMI |
| 295 mg/dL | 16.4 | 10.4 % GMI |
| 296 mg/dL | 16.4 | 10.4 % GMI |
| 297 mg/dL | 16.5 | 10.4 % GMI |
| 298 mg/dL | 16.5 | 10.4 % GMI |
| 299 mg/dL | 16.6 | 10.5 % GMI |
| 300 mg/dL | 16.7 | 10.5 % GMI |
| 301 mg/dL | 16.7 | 10.5 % GMI |
| 302 mg/dL | 16.8 | 10.5 % GMI |
| 303 mg/dL | 16.8 | 10.6 % GMI |
| 304 mg/dL | 16.9 | 10.6 % GMI |
| 305 mg/dL | 16.9 | 10.6 % GMI |
| 306 mg/dL | 17.0 | 10.6 % GMI |
| 307 mg/dL | 17.0 | 10.7 % GMI |
| 308 mg/dL | 17.1 | 10.7 % GMI |
| 309 mg/dL | 17.2 | 10.7 % GMI |
| 310 mg/dL | 17.2 | 10.7 % GMI |
| 311 mg/dL | 17.3 | 10.7 % GMI |
| 312 mg/dL | 17.3 | 10.8 % GMI |
| 313 mg/dL | 17.4 | 10.8 % GMI |
| 314 mg/dL | 17.4 | 10.8 % GMI |
| 315 mg/dL | 17.5 | 10.8 % GMI |
| 316 mg/dL | 17.5 | 10.9 % GMI |
| 317 mg/dL | 17.6 | 10.9 % GMI |
| 318 mg/dL | 17.7 | 10.9 % GMI |
| 319 mg/dL | 17.7 | 10.9 % GMI |
| 320 mg/dL | 17.8 | 11.0 % GMI |
| 321 mg/dL | 17.8 | 11.0 % GMI |
| 322 mg/dL | 17.9 | 11.0 % GMI |
| 323 mg/dL | 17.9 | 11.0 % GMI |
| 324 mg/dL | 18.0 | 11.1 % GMI |
| 325 mg/dL | 18.0 | 11.1 % GMI |
| 326 mg/dL | 18.1 | 11.1 % GMI |
| 327 mg/dL | 18.2 | 11.1 % GMI |
| 328 mg/dL | 18.2 | 11.2 % GMI |
| 329 mg/dL | 18.3 | 11.2 % GMI |
| 330 mg/dL | 18.3 | 11.2 % GMI |
| 331 mg/dL | 18.4 | 11.2 % GMI |
| 332 mg/dL | 18.4 | 11.3 % GMI |
| 333 mg/dL | 18.5 | 11.3 % GMI |
| 334 mg/dL | 18.5 | 11.3 % GMI |
| 335 mg/dL | 18.6 | 11.3 % GMI |
| 336 mg/dL | 18.7 | 11.3 % GMI |
| 337 mg/dL | 18.7 | 11.4 % GMI |
| 338 mg/dL | 18.8 | 11.4 % GMI |
| 339 mg/dL | 18.8 | 11.4 % GMI |
| 340 mg/dL | 18.9 | 11.4 % GMI |
| 341 mg/dL | 18.9 | 11.5 % GMI |
| 342 mg/dL | 19.0 | 11.5 % GMI |
| 343 mg/dL | 19.0 | 11.5 % GMI |
| 344 mg/dL | 19.1 | 11.5 % GMI |
| 345 mg/dL | 19.1 | 11.6 % GMI |
| 346 mg/dL | 19.2 | 11.6 % GMI |
| 347 mg/dL | 19.3 | 11.6 % GMI |
| 348 mg/dL | 19.3 | 11.6 % GMI |
| 349 mg/dL | 19.4 | 11.7 % GMI |
| 350 mg/dL | 19.4 | 11.7 % GMI |
Questions
Can GMI diagnose anything?
No. It's a management tool for people using a sensor. Diagnosis uses lab tests.
How much sensor data do I need?
The authors used 14 days or more. Fewer days can swing a lot on one unusual week.
I don't have diabetes. Does GMI apply?
The equation came from people with diabetes, and it's less studied without it. Treat it as a rough read.
Why do you ask for my lab A1C?
Only to show the gap. It stays in your browser, like everything else you enter here.
Sources
Written by LifeFrom from the sources above, and not yet reviewed by a clinician. An estimate for your own understanding: it doesn't diagnose or treat anything, and it doesn't replace your doctor.
