Tools
Free, no sign-up, and each one shows its formula and a worked example. They are starting points, not prescriptions.
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Fast-day planner
Choose how many fast days you want and where the week starts. Get the week laid out, Monday, Wednesday, Friday style.
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Carb cycling calculator
Estimate your daily energy need (Mifflin-St Jeor) and a starting carbohydrate range for normal days.
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Carb target estimator
A quick carb range for fast days and normal days from your weight and your goal.
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HbA1c to average glucose
Convert an A1c to the estimated average glucose your meter would show, and back (ADAG, Nathan 2008).
The free book
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