Use the handy calculation tool to the right to find your blood sugar/insulin ratio
based on the **1500 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 blood sugar/insulin
ratio.

**Instructions for using the 1500 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 **Blood Sugar/Insulin
Ratio** scale and note the number. This is your blood sugar to insulin
ratio based on the **1500 Rule**. **Note:** If you use**mmol/l** *as units for BG measurement, use the scale to the right rather
than the left.*

Humalog users may wish to use the **1800 Rule** instead of the **1500
Rule** to estimate Blood Sugar / Insulin ratios. A discussion of the **1800
Rule** is included in the article
Changing To Humalog?, What You Need To Know On A Pump by John Walsh, P.A., C.D.E., and Ruth
Roberts, M.A.