500 Rule

Calculate your carb ratio step by step

Enter your total daily dose TDD, then we will calculate the standard ICR from the 500 / TDD formula in a clear and direct way.

Formula

ICR = 500 / TDD

This calculation gives only the standard ICR, not custom meal-specific ratios if you use them.

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Enter TDD Step 1

Carb ratio result Step 2

Step 1

Enter TDD

Enter your total daily dose, or use the value already loaded from your account if available.

Total Daily Dose (TDD)

Enter a valid TDD value greater than zero.

Step 2

The following result is the standard ICR calculated directly from the 500 rule.

ICR 1 : 0.00

TDD 0.00

Result 1 وحدة = 0.00

Formula 500 / 0.00 = 0.00

This page gives the standard ICR from the 500 rule only.
If you use different ICR values for breakfast, lunch, or dinner, those should remain the priority inside the carb calculator.
You can later update TDD from Carb Settings if your doses change.