Clinician-settings worksheet only This page is not a generic dose recommender. It only works when you already have clinician-prescribed insulin-to-carb, target, and correction settings, and it suppresses dosing output when common safety-stop situations apply.
Dose Worksheet
Work through clinician-prescribed mealtime insulin maths
Enter your own diabetes-plan settings to separate the carbohydrate dose from the correction dose. If a hard-stop context applies, the page blocks generic dosing output on purpose.
Glucose Unit
Hard Stop Conditions
If any of these apply, the page hides dosing output and points you back to your own diabetes plan.
Enter clinician-prescribed settings Add your carbohydrate amount, glucose values, insulin-to-carb ratio, and correction factor to see the worksheet maths.
Insulin dosage calculator guide: a clinician-settings meal worksheet
A public insulin dosage calculator is only defensible when it stays narrow. This version does not invent insulin-to-carb ratios, correction factors, or target glucose numbers for the user. It works only as a worksheet for adults who already have clinician-prescribed mealtime settings, and it deliberately shuts off output when common safety-stop conditions make generic web maths unsafe.
What this page does and does not do
This page separates meal insulin arithmetic into two familiar parts: a carbohydrate dose based on the grams you plan to eat and a correction dose based on the glucose level you enter. The page only works when those settings already come from your clinician or your existing written diabetes plan.
That narrowness matters. It does not choose your insulin-to-carb ratio, your correction factor, your target, or your correction threshold. It also does not try to account for insulin on board, pump algorithms, sick-day rules, pregnancy, paediatric dosing, or exercise-related dose changes. Those contexts need a different plan from a generic public worksheet.
Why the worksheet asks for clinician-prescribed settings
Insulin dose arithmetic is only as safe as the settings behind it. The same meal and glucose reading can lead to very different doses in two different people because their insulin sensitivity, treatment plan, device type, and active insulin status differ. That is why this page requires you to supply the numbers you were already given rather than pretending one universal formula fits everyone.
Public school-diabetes and self-management guidance regularly separates insulin-to-carb ratio, correction factor, target glucose, and correction thresholds because those settings are individualized. This page follows that same structure and refuses to act like a standalone treatment recommender.
Carb dose = meal carbohydrate grams / clinician-set insulin-to-carb ratio
This gives the carbohydrate coverage line only when you already know the ratio prescribed for you.
This page only adds a correction line when your current glucose is above the correction threshold you enter.
Further reading
ADA Safe at School — Diabetes Medical Management Plan — ADA Safe at School page hosting the current DMMP and explaining how individualized diabetes plans separate insulin-to-carb ratios, correction factors, target ranges, and dose administration details.
Worked example: meal dose plus correction
Suppose an adult already has clinician-set mealtime numbers of 1 unit for every 12 g carbohydrate, a correction factor of 50 mg/dL per unit, a target glucose of 110 mg/dL, and a correction threshold of 150 mg/dL. If the meal contains 60 g carbohydrate and the current glucose is 210 mg/dL, the carb line is 60 / 12 = 5 units and the correction line is (210 - 110) / 50 = 2 units, giving a worksheet total of 7 units before any device-specific rounding.
That example shows the narrow role of the page. It is only carrying out arithmetic from settings the user already has. It is not deciding whether those settings are right, whether active insulin is still present, or whether exercise, illness, ketones, pregnancy, or pump logic should change the dose.
When the page deliberately refuses to show a dose
The calculator suppresses output for recent rapid-acting insulin, pump or automated insulin delivery users, ketones or illness, pregnancy, paediatric use, and exercise-sensitive contexts. Those are not decorative warnings. They are the situations where public one-size-fits-all dose maths is most likely to be misleading or unsafe.
It also blocks dose output when glucose is very low or very high. Low glucose belongs to hypo treatment rather than more insulin. Markedly high glucose can trigger ketone checks, sick-day rules, or a clinician-directed correction plan that cannot be replaced by an online worksheet.
Do not use this page to initiate insulin therapy or change your own prescribed settings.
Do not use it as a replacement for a pump bolus wizard, AID system, or written sick-day plan.
If ketones, vomiting, severe illness, or recurrent lows are in the picture, clinical guidance matters more than web arithmetic.
Why rounding and device logic still matter
The output is shown to the nearest tenth of a unit so the arithmetic is transparent, but real treatment devices do not all round the same way. Pens may use half-unit or whole-unit increments, and pumps can apply active-insulin logic that a generic public page should not attempt to mimic.
That is why the safest way to use this page is as a pre-dose worksheet alongside your prescribed plan, not as an instruction engine. If the number conflicts with what your own written plan or approved device says, your own plan and device win.
Frequently asked questions
Why does this page ask me to enter my own ratio and correction factor?
Because those settings are individualized. The page is only a worksheet for numbers that were already prescribed for you. It is intentionally not designed to guess or recommend those settings.
Why is there no result if I use a pump or AID system?
Pump and automated insulin delivery systems often account for active insulin, device-specific settings, and additional logic that a public web page should not try to reproduce. In that situation your own approved device or written plan is the safer reference.
Why does the page block output for ketones, illness, pregnancy, or children?
Those situations often need a different insulin plan from routine adult meal maths. Sick-day rules, pregnancy-specific targets, and paediatric dosing are not safe to flatten into a generic public calculator.
Can I use this page to lower a dose when my glucose is below target?
No. The worksheet avoids negative or “subtraction” dosing advice. If glucose is below target, follow your own hypo plan or clinician instructions rather than improvising from an online calculation.
Why does this insulin dosage calculator not use the 500 rule or 1800 rule?
Those rules are sometimes taught as clinical starting-point heuristics, but a public page should not use them to create personal insulin-to-carb ratios or correction factors. This calculator is intentionally narrower: it only performs meal and correction arithmetic from clinician-prescribed settings you already have.
Is this the same as a pump bolus calculator?
No. A pump or automated insulin delivery system can use device-specific settings, insulin-on-board logic, basal context, and safety checks that this page does not and should not reproduce. If you use a pump or AID system, use the approved device workflow and your diabetes team's instructions instead.
