8 free tools · No sign-up
Free calculators
Eight calculators, free and without a sign-up. Every one of them is deterministic arithmetic on values you enter — none suggests an amount, a schedule, a product or a source. That limit is what makes it defensible to publish them openly: arithmetic is not advice.
Peptide reconstitution calculator
Vial mass and diluent volume in; concentration, draw volume and syringe units out.
Open calculator →Peptide unit converter
Convert between mg, mcg, mL and syringe units at a known concentration.
Open calculator →Syringe unit converter
Units to mL to amount, across U-100, U-50 and U-40 calibrations.
Open calculator →Bacteriostatic water calculator
Work backwards: choose a target concentration, get the diluent volume to add.
Open calculator →Vial duration calculator
How many entries a vial holds, and roughly what date it runs out.
Open calculator →Blend calculator
One vial, several peptides — see what every component contributes per unit.
Open calculator →Cycle length planner
Project an every-N-day or on/off schedule across a real calendar.
Open calculator →Injection site rotation planner
Generate a deterministic rotation order across the sites you actually use.
Open calculator →Frequently asked questions
Are these calculators free?
Yes, entirely. No sign-up, no download, no limits. They run in your browser and no values are transmitted or stored anywhere.
Do these tools recommend a dose?
No, and that limit is deliberate. Every tool here converts numbers you enter — it does not know your prescription, your compound or your situation, and it never suggests an amount, a schedule or a product.
Can I use these for GLP-1 pens?
Not the reconstitution tools. A pre-filled pen has a fixed concentration and a device that meters the amount, so there is nothing to calculate. The syringe unit converter does apply to pharmacy-compounded vials, where you draw a volume from a stated concentration.
Is my data sent to a server?
No. All arithmetic runs client-side in JavaScript on the page. Nothing you type is transmitted, logged or stored.
Log it once, keep it forever
PepCycle turns the numbers on this page into a running record: every dose, vial, site and side effect in one place — stored on your iPhone and backed up to your own iCloud.
Free to download · No account required · Price shown before you enter anything personal