Injection Calculators & Tools

Free tools for reconstitution maths, dose volume, blending and cycle planning. No sign-up, nothing stored.

GLP-1 Dose Calculator Convert a compounded semaglutide or tirzepatide dose in mg into the units to draw, with FDA titration schedules and a next-dose reminder. Open TRT Dose Calculator Turn a weekly testosterone dose and vial concentration into the millilitres and units to draw per injection, across common frequencies. Open Dose Volume Calculator Turn vial strength, bacteriostatic water and your target dose into the exact millilitres and insulin-syringe units to draw. Open IU Calculator Work out dose volume for IU-marked peptides like HGH, converting IU to milligrams using your vial's potency. Open Blending Calculator Plan a multi-peptide blend in a single vial and see each dose drawn on a visual syringe. Open Beyond-Use-Date Calculator Work out a conservative use-by date for a reconstituted peptide from its reconstitution date and how you store it. Open Cycle Planner Plan by duration to lay out a titration schedule, or plan by supply to see how long your vials will last. Open HGH Calculator Convert an HGH vial's IU and your target dose into the millilitres and units to draw. Open

Which calculator should I use?

Find the situation that matches yours.

Your vial is in milligrams and you have added bacteriostatic water: Dose Volume Calculator — gives the units to draw for a given dose.
Your vial is marked in IU rather than mg: IU Calculator — for IU-marked peptides. For HGH specifically, use the HGH Calculator.
You are combining more than one peptide in a single vial: Blending Calculator — shows each one's draw separately.
You are planning a course over time: Cycle Planner — by duration for a titration schedule, or by supply to see how long your vials last.
You are dosing compounded semaglutide or tirzepatide: GLP-1 Dose Calculator — mg to insulin-syringe units, with the FDA titration schedules alongside.
You are dosing testosterone: TRT Dose Calculator — weekly dose and vial concentration to mL and units per injection.
You need to know how long a reconstituted vial lasts: Beyond-Use-Date Calculator — a conservative use-by date from your mixing date and storage.

How the reconstitution maths works

Every reconstitution comes down to three steps.

Concentration. Divide the vial's strength by the volume of bacteriostatic water you add. A 10 mg vial in 2 mL of water is 5 mg/mL.
Volume. Divide your target dose by that concentration to get the millilitres to draw.
Units. On a U-100 insulin syringe, multiply the millilitres by 100 to read the unit markings, so 0.25 mL is 25 units.

The calculators do this for you and validate each input, so an obvious slip is caught before you draw.

Frequently asked questions

Is any of the information I enter stored or sent anywhere?

No. Nothing you type is transmitted to us or saved on our servers.

Do these tools give medical or dosing advice?

No. They perform arithmetic on the numbers you enter and do not recommend a dose or a protocol. Always confirm your vial concentration, syringe type and dosing plan with your prescriber or pharmacist.

Which syringe do the results assume?

Unit results assume a U-100 insulin syringe, where 1 mL equals 100 units. Check the markings on your own syringe before drawing.