This is supposed to be different by weight, but my chart doesn't always hold up. If you're T1, would you mind giving your weight (Kg or lbs) and what 1 gram of carb raises your blood sugar (mg/dL or mmol)? Exclude yourself if you are on drugs that also raise it or if you are pregnant - sorry, that's too confounding! I'll put together a chart when I have enough data. Any problems you see, let me know.
104 lbs: 1 gram carb raises me 6.5 mg/dL