Peptide dosage & cycle calculator
Plan the logistics of a cycle. Enter the dose per injection, how often, the cycle length and your vial size — and see the weekly and total amount, how many vials you’ll need, how long a vial lasts, and the cost per dose and per cycle. It does the arithmetic; it does notrecommend a dose.
Presets fill a common vial size only — not a dose. Most research peptides have no FDA-approved human dose; the dose and schedule should come from your clinician.
Per cycle
56 doses · 14.0 mg total over 8 weeks
- Weekly total
- 1,750 mcg
- 1.75 mg / week
- Doses per vial
- 20
- ≈ 2.9 weeks / vial
- Cost / cycle
- —
- optional
- Cost / dose
- —
- optional
Pure planning arithmetic — supply, totals and cost — not a dose recommendation. For the volume to draw on a U-100 syringe after mixing, use the peptide reconstitution calculator.
Planning a cycle, not prescribing one
The hard, important question with peptides is what dose and whether to use them at all — and for most research peptides there is no approved human answer. This tool stays out of that decision on purpose. Once a dose and schedule exist, though, the supply math is simple and worth getting right: a 5 mg vial at 250 mcg per injection is twenty doses, so a daily eight-week cycle needs three vials and change. Knowing that up front prevents the mid-cycle scramble — and the cost-per-dose figure is often a reality check on what a “cheap” peptide actually costs over a full cycle.
For the next step — turning a vial and bacteriostatic water into the exact units to draw — use the peptide reconstitution calculator. For what the evidence actually shows on each compound, see the peptide evidence matrix, and for safe-sourcing, where to get peptides safely.
Common questions
- Does this tool tell me how much of a peptide to take?
- No. It deliberately does not recommend a dose. Most research peptides have no FDA-approved human dose, and the right dose, frequency and cycle length are decisions for a clinician who knows your situation. This calculator only does the arithmetic around a dose you already have — how much a cycle uses, how many vials that takes, how long a vial lasts, and what it costs. The vial-size presets fill a common vial size, never a dose.
- How do I figure out how many vials a cycle needs?
- Doses per vial = vial size ÷ dose per injection (a 5 mg vial at 250 mcg per dose is 20 doses). Total doses = injections per week × weeks in the cycle. Vials per cycle = total doses ÷ doses per vial, rounded up. The calculator does all of this for you and also shows roughly how many weeks one vial lasts at your frequency.
- What's the difference between this and the reconstitution calculator?
- They answer different questions. The reconstitution calculator converts a vial, the bacteriostatic water you add, and your dose into the exact number of units to draw on a U-100 insulin syringe — the at-the-bench step. This dosage and cycle calculator works at the planning level: weekly and per-cycle totals, how many vials to buy, and cost. Use them together — plan the cycle here, then draw each dose with the reconstitution tool.
- Why does the calculator keep saying these aren't approved doses?
- Because for most of these compounds it's true, and it's the most important thing to know. Peptides like BPC-157, TB-500, MOTS-c and Ipamorelin are research chemicals with no approved human dose; the figures circulated online are community convention, not validated protocols. A few — like PT-141 (Vyleesi) or tesamorelin (Egrifta) — do have approved doses for specific indications. Either way, the planning math here is not medical advice.