Free GLP-1 calculators and tools
Free GLP-1 calculators for units to mg, missed doses, dose schedules, half-life, fridge limits, BMI and protein.
- Runs on this device
- Every figure has a source
- Not medical advice
Dose math
Tirzepatide units calculator
You’ll need: your tirzepatide vial’s strength and your prescribed dose
Semaglutide units calculator
You’ll need: your semaglutide vial’s strength and your prescribed dose
How much did I take?
You’ll need: your vial’s printed strength and the units you drew
Zepbound vial units to mg
You’ll need: the dose printed on your vial and the units you injected
GLP-1 units to mg calculator
You’ll need: your label’s strength and your prescribed dose
Concentration label quiz
You’ll need: nothing, just a few minutes
Schedules and storage
Missed dose rules by label
You’ll need: your medicine and when the dose was due
Dose schedule from the label
You’ll need: your medicine
Half-life calculator
You’ll need: your medicine and last dose date
Out-of-fridge and storage dates
You’ll need: your medicine, presentation and dates
Weight and body
Reach Onederland or your goal
You’ll need: two or more weigh-ins, at least two weeks apart
BMI calculator
You’ll need: your height and weight
Protein calculator
You’ll need: your weight
Outside the label5
No FDA-approved label describes these uses. We’re not suggesting them, and these tools don’t make them safe. People already do this arithmetic at home, and FDA has adverse event reports, some needing hospital care, that may be related to getting it wrong. So here it is without silent rounding, beside what FDA and the labels say.1
- Each opens with its own warning, and shows no result until you’ve read it and ticked a box.
- Ask your prescriber or pharmacist first. Their instructions come before anything here.
- If you use an FDA-approved medicine as its label says, you don’t need these.
Powder vial math
You’ll need: your written mixing instructions and prescribed dose
Split-dose math
You’ll need: your prescribed dose and schedule
Two vials, one dose
You’ll need: both vial labels and your prescribed dose
Vials labeled per 0.5 mL
You’ll need: your vial label and prescribed dose
Retatrutide units and mg
You’ll need: the label’s strength and the amount to check
Sources
- FDA: dosing errors with compounded injectable semaglutide, July 26, 2024. fda.gov
Label sources last checked on October 30, 2026. Onederland summarizes them; your prescriber and the full prescribing information come first.
About these tools
For reading your label, your syringe and your schedule.
Label rules, storage, weight and nutrition.
These tools do arithmetic. Your prescriber decides.
Each tool does arithmetic on a label, a paper or your own entries, and shows its source. The tools under “Outside the label” go further: they work out numbers for mixing a powder, changing a weekly schedule, drawing from two vials and a medicine that isn’t approved. Working out a number doesn’t make it safe, approved or right for you. Which dose you take, and when you change it, is for you and your prescriber.
- They don’t choose your dose, your schedule or a mixing amount. You type those from your own instructions.
- They can’t check what’s in a vial, or how it was made or stored.
- They can’t tell you that anything outside the label is safe or works.
- They don’t replace your prescriber or pharmacist. Ask them before you change anything.
Always follow your doctor’s or prescriber’s advice and guidance. Talk to your prescriber before changing your dose.
Published by Micktron LLC · Sources checked October 30, 2026
- Runs on this device. Nothing you type is sent anywhere.
- Every figure names its source, below.
- Education, not medical advice. Your prescriber comes first.
About these tools
Do you see what I type?
No. Every tool runs in your browser. Nothing you type is sent to Onederland or anyone else, and nothing is saved after you leave the page.
Are these tools medical advice?
No. They are for education. Your prescriber and pharmacist know your health and your prescription, and their instructions come first.
Where do the numbers come from?
From prescribing information, public health agencies, published papers, or from the numbers you type. Each tool lists its sources and the date they were last checked.
Are they in the Onederland app?
No. They live here on the website. The app tracks your doses, weight and food over time.
Why do you have tools for things the labels don’t support?
Because people already do this arithmetic, and FDA has reports of people needing hospital care that may be related to getting it wrong. Having a tool here doesn’t mean we recommend the use. Each one says what the labels and FDA say about it.
