Injection dose calculators and tracker for TRT, peptides and GLP-1

Know exactly what to draw, every injection. Plus a free tracker if you want one.

For calculators, no login is needed and your calculation inputs stay in your browser. Saved dose and blood-panel tracking needs a free account; your records are private to your account.

What are you calculating?

Pick your group, then your tool.

Testosterone (TRT)

Weekly dose to syringe units

TRT dosage calculator TRT microdosing calculator HCG dosage calculator Steroid dosage calculator Ester bioavailability and half-life

Peptides

Mixing and how much to draw

Peptide dosage calculator Peptide reconstitution (how much water) BPC-157 calculator BPC-157 + TB-500 blend

GLP-1

Weight-loss injections

Semaglutide (Ozempic, Wegovy) Tirzepatide (Mounjaro, Zepbound) Retatrutide GLP-1 titration calculator

Blood test and body

Understand your numbers

Free testosterone calculator Free testosterone index BMI calculator

Plan and track

Free account, private

Cycle plotter Injection calendar

All tools

Every calculator in one list

All calculators

Popular guides

New to injections or dialling in a protocol? Our free injection and dosage guides explain the maths, titration, storage, and safety in plain language.

TRT guideDoses, esters and schedules Semaglutide dosingOzempic and Wegovy Tirzepatide dosingMounjaro and Zepbound BPC-157 guideMixing and dosing Testosterone esters explainedHalf-lives and timing Rotating injection sitesSite care and rotation Peptide reconstitutionMixing and concentration Blood test terms glossaryUnderstand your markers TRT protocols explainedPlan your schedule Injection safety checklistPrepare and inject safely Medication storageVials, expiry and supply