Use the handy calculation tool to the right to find your carbo/insulin ratio
based on the **450 Rule** by entering your total
daily insulin use (**TDIU**) in the entry box and clicking on **SUBMIT**
or
follow the instructions for the graph below to look up your carbo/insulin
ratio.

**Instructions for using the 450 Rule Graph**

Find your total daily insulin use (**TDIU**) on the **horizontal** scale
at the bottom of the graph. From your **TDIU** draw a line vertically up
until it intersects the red curve. From the intersection point on the curve,
draw a line horizontally to the left until it intersects the **Carbo/Insulin
Ratio** scale and note the number. This is your carbohydrate to insulin
ratio based on the **450 Rule**.