iPhone Screenshots


RapidCalc is proudly supported by GlucoMen in UK and Ireland.

RapidCalc is a sophisticated bolus insulin dose calculator for diabetics following a basal-bolus regimen. With intelligent tracking of insulin on board, automatic carbohydrate ratio and blood glucose target selection, RapidCalc dramatically simplifies blood glucose management. Complete with detailed history, charting and statistics features, RapidCalc is designed to be easy to use and easy to live with.

Can't remember when or how much you last dosed? - Don't worry. RapidCalc avoids dose stacking by keeping track of your bolus doses and factoring in Insulin On Board when calculating a suggested dose.

RapidCalc supports up to 6 different target blood glucose levels, correction factors and carbohydrate ratios for different times of day and automatically selects the appropriate values when calculating a suggested dose.

Unique slide-and-tap controls let you enter your blood glucose and carbohydrate values quickly and easily. Simply drag the slider close to your value and then tap on the slider rail to make fine adjustments. As you adjust your values RapidCalc instantly recalculates suggested meal and correction bolus doses.

RapidCalc also makes it easy to record your background insulin doses and supports up to three preset doses with optional reminders.

RapidCalc delivers many of the benefits normally associated with an insulin pump and indeed users describe it as being like "pumping without a pump". With RapidCalc it is possible to achieve control similar to that of a well set up pump.

Integrated dose adjustment for exercise based on intensity and duration as well as compensation for recent hypos or alcohol.

RapidCalc effectively replaces your log book, providing a full 90-day history of blood glucose readings, insulin doses and carbohydrate intake which can be exported via email for archive or analysis. Built-in charts and summary statistics help you assess your blood glucose control, identify trends and even estimate your HbA1c.

> Intelligent tracking of Insulin On Board
> Suggested insulin dose based on blood glucose, carbs and insulin on-board
> Automatic target pre-meal blood glucose level selection
> Automatic correction factor and carb ratio selection
> Unique slide-and-tap input for quick data entry
> Basal dose recording with with presets and reminders
> Dose adjustment for exercise intensity and duration
> Clear, interactive controls with instant dose feedback
> Charting of blood glucose readings and trend data
> Pre and post meal BG comparisons
> Summary statistics for doses, glucose and carbohydrates
> Estimated HbA1c based on average readings
> 90-day rolling history
> Backup/Export history data and settings via email
> Integrated safety warnings and guidance
> Choice of mmol/L or mg/dL blood glucose units
> Enter Carbs in grams or portions of 10, 12 or 15g
> Choice of % or mmol/mol HbA1c units
> Customised carb ratios and correction factors
> Customised target, warning and ideal glucose levels
> Password protected settings for pediatric use
> No Wifi or 3G connection needed
> Built-in help

RapidCalc is intended for guidance only and is not a substitute for professional medical advice. Always discuss use of the calculator with your health care professional and only use personal settings agreed with them. If you are in any doubt as to the correct insulin dose always follow the advice of your healthcare professional.

What’s New

Version 2.1.6

Changes in this version:
- Fixed display bug in settings

Ratings and Reviews

4.3 out of 5
39 Ratings

39 Ratings

Zanclod ,

Very helpful

Keeps track of all your blood sugars which must be recorded in the app. Calculates the amount of RAI = Rapid Acting Insulin based on blood sugar level, the time the last RAI shot was taken, the amount (gms) of carbohydrate to be taken shortly, the type, intensity and duration of physical activity. Also keeps track of Long Acting Insulin shots. 10-11 settings based on instructions from your health care professional. Reminders of after RAI shots. Continuous decreasing IOB= Insulin On Board. Not perfect app, heavy inputting but very helpful to manage blood sugar.

jonathanbumble ,

Update...Still GREAT. Thank you. Super Helpful for better understanding and Diabetes control

Still Love this app. Use every time I dose or eat, before/afterany Event. It is almost PERFECT. I tried the pump but gave up after so many failures and disconnections. Returning to RapidCalc, I now use it with a newfound appreciation. Wish I could sync Readings Via Blutooth? I tried to Reimport data into new IPhone but could not figure this out..? Still using everyday, almost everytime I test, it still great.

If I use it every time I shoot up and or eat, it becomes a perfect app. When I get lazy then it looses it's usefulness. Using this App I have way better control! Helps to remind me what I ate/shot hours earlier and to consider All the various factors that affect your blood sugar's ups and downs. Good interface. Completely customizable to your body's situation. I wish it had more graphs and that that I could send data in a simpler way. Really good. Type 1, 24 years, Novalog, Lantis, syringes.

Developer Response ,

Jonathan, thank you for the review and feedback. You can easily import your data and settings into your new iPhone using the backup function in RapidCalc and sending the resultant email to an email account set up on your new iPhone. On your new iPhone open this email and double click on each of the settings and history files attached to the backup email. This will restore both your settings and your history to your new iPhone. We also have a trial report writing facility - send your export files directly from RapidCalc to rapidcalcreports@gmail.com and you will receive a comprehensive set of PDF reports emailed back to you within 30 minutes. All emails are then deleted from the server so no data is kept

dpelikan ,

Update: Four Years of Use

I've been using RapidCalc daily for over four years and without exaggeration it is the best thing I've ever done for managing my Type 1 diabetes.

I was able to adjust my numbers to create a program specifically for me that changes based on my sensitivities throughout the day. I made small tweaks until I started seeing the blood sugars I wanted. I was able to do this over a couple of weeks, instead of waiting months between doctors appointments. This app has objectively increased my likeliness of staying healthy for a long time.

I currently use the Dexcom 6 app to track my blood sugars, MyFitnessPal to record carbs of my meals, and RapidCalc to calculate those two numbers into insulin dosages. No more poorly designed PDMs, I do everything on my phone (can’t afford a Dexcom? The iHealth glucometer is cheap and uses an app). I love this setup. Ian's app has taken so much anxiety out of managing blood sugar levels.


Gilport Enterprises Pty Ltd
5.3 MB
Health & Fitness

Requires iOS 6.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, Italian, Spanish

Age Rating
Rated 12+ for the following:
Infrequent/Mild Medical/Treatment Information
© 2010-2015 Gilport Enterprises Pty Ltd


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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