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Insulin Calculators & Apps

These web-based and mobile calculator apps are designed for simple calculations of lunchtime insulin doses in the Canadian school setting.

Web apps

With this calculator, you can calculate the number of units of insulin to adjust a dose, based on the trend arrows of your CGMS (Dexcom G5®/G6®, Medtronic Enlite® 2/Guardian™ 3, or FreeStyle Libre®) and your correction/sensitivity factor (ISF, in mmol/L or mg/dL). Alternatively, using your carb ratio (in grams), you can adjust your carbohydrate intake to offset the predicted rise or fall in blood glucose with time. These calculations are only to be used pre-meals and -snacks, and 3 hours or more hours after the previous insulin dose was given, to avoid insulin stacking. These calculations are not valid for use in children under the age of 2 years. Calculations do not account for active insulin/insulin-on-board, nor for activity! Based on Laffel LM et al. J Endocr Soc 2017;1(12):1461–1476.

 

With this calculator, you can generate a full insulin sliding scale for kids on multiple daily injections, based on carb ratio (which must be between 2–50 grams), correction/sensitivity factor (ISF, which must be between 1–20 mmol/L or 18–360 mg/dL), and target blood glucose (the default is 6 mmol/L or 100 mg/dL). Insulin doses are rounded down to the nearest half-unit for carb ratio 13–50 or ISF 3.2–20 mmol/L (56–360 mg/dL), to the nearest unit for carb ratio 8–13 or ISF 1.6–3.1 mmol/L (28–55 mg/dL), to the nearest 1.5 units for ISF 1–1.5 mmol/L (18–27 mg/dL), and to the nearest 2 units for carb ratio 2–7.9. Calculations do not account for active insulin/insulin-on-board, nor for activity!

With this calculator, you can do a simple insulin bolus calculation for kids on multiple daily injections, based on carbohydrate ratio (in grams), correction/sensitivity factor (ISF, in mmol/L or mg/dL), target blood glucose (the default is 6 mmol/L or 100 mg/dL), current measured blood glucose (in mmol/L or mg/dL), and carbs to be consumed (in grams). Insulin doses are rounded off to the nearest half-unit. Calculations do not account for active insulin/insulin-on-board, nor for activity!‎

 

With this calculator, you can create a simplified insulin sliding scale for kids on a fixed amount of carbs at lunch, based on baseline insulin dose (the dose they get when their blood glucose is in target), correction/sensitivity factor (ISF, which must be between 1–20 mmol/L or 18–360 mg/dL), and target blood glucose (the default is 6 mmol/L or 100 mg/dL). By ticking the box for “Extra Carbs”, you can add/subtract carbs for variations from normal. Insulin doses are rounded down to the nearest half-unit for ISF 3.2–20 mmol/L (56–360 mg/dL), to the nearest unit for ISF 1.6–3.1 mmol/L (28–55 mg/dL), and to the nearest 1.5 units for ISF 1–1.5 mmol/L (18–27 mg/dL). Calculations do not account for active insulin/insulin-on-board, nor for activity!

 

BolusCalc app for Android and iOS boluscalc.png

Our BolusCalc app is available on Android Play and on the App Store. This app is designed for simple calculations of lunchtime insulin doses in the Canadian school setting (although calculations can also be done in U.S. mg/dL blood glucose units). There are 5 screens available: The Simple Insulin Bolus screen calculates a lunchtime insulin dose for kids on multiple daily injections (MDI) based on carb ratio, correction/sensitivity factor (ISF), target BG (6 mmol/L or 100 mg/dL is the default), carbs to be consumed, and current BG. The Simple Insulin Scale screen generates a simplified insulin sliding scale for kids who are on a fixed dose of carbs at lunch, based on baseline insulin dose, ISF, and target BG. The Full Sliding Scale screen generates a full insulin scale for kids on MDI based on carb ratio, ISF, and target BG. The Correcting for Arrows screen allows you to calculate an increase or decrease in insulin dose (or carbs) to account for positive or negative direction arrows for CGMS users. The More School Resources screen contains links to websites devoted to the care of children with diabetes in the school setting. For all screens, there is the ability to share a time-stamped copy of the data generated with a student’s parent or caregiver via text, e-mail or other phone app.

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