If you measure blood glucose units in mg/dL you can get help with the calculation by pressing the buttons “Help with the 1800-rule” and “Help with the 500-rule”.

The rules can be summarised as follows;

**The 1800 rule**is used to calculate your insulin sensitivity factor, that is, how many mg/dl 1 unit of insulin lowers the blood glucose level. Insulin sensitivity factor, equals 1800 divided by the total daily dose.**The 500 rule**is a calculation where 500 is divided by your total daily dose to give you the number of grams covered by 1 unit of rapid-acting insulin.

For example, if your total daily dose was 50, the calculation would be as follows: 500 ÷ 50 = 10. This would mean that 10 grams of carbohydrate would require 1 unit of insulin, giving a ratio of 1:10.

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