Theoretically, I don’t think so. Calorie calculations are laughable at the best of times, so trying to pinpoint it for a threshold (where the speed varies for everyone) would be next to impossible, I think.

I have seen estimates from gas exchange tests though. Because they are measuring the burn rates of fat/versus carbs, that estimate may be closer to the mark. At least it starts with a measurement anyway.

I would start with general recommendations based on your goal event, and then experiment to find out what works for you.

Note that carbohydrate intake during training should be lower than during races. “Train on fat, race on carbs.”