What this site does
- Converts a dose you enter into a volume and a syringe mark.
- Warns when a result is hard to measure, does not fit, or looks like a unit mix-up.
- Runs in your browser. Nothing you type is sent or stored.
What it does not do
- It does not recommend a dose, a schedule or a compound.
- It does not sell or link to sellers of any drug, and earns no commission from them.
- It does not know your medical history and is not a substitute for a prescriber or pharmacist.
Know what you have
Semaglutide and tirzepatide are approved medicines when prescribed and dispensed by a licensed pharmacy. Many other peptides sold online are labelled for research use and are not approved for human use. They have little or no human safety data, and nobody checks that the vial contains what the label says. A correct calculation cannot make an unknown product safe.
Check every result
- Read the dose line and confirm the mcg and mg figures are what you intended.
- Use the table under the result to check the mark against your dose.
- Compare with the instructions from your pharmacy. If they disagree, ask before you inject.
- Recalculate for every new vial. Concentrations change.
If something goes wrong
If you think you took too much, or you have severe or lasting symptoms, contact your local emergency number or a poison control centre. In the United States, Poison Control is 1-800-222-1222.
Check the maths yourself
The formula is shown on each page so you can check any result by hand.