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Free Peptide Calculator — Reconstitution & Dosage Tool

Precise peptide dosing, every time.

PepFormula is a free peptide calculator covering reconstitution, dosing, and BAC water volumes for 25+ compounds. Enter your vial size and BAC water amount to instantly calculate concentration, injection volume, and syringe units — no sign-up needed. Use it for BPC-157, semaglutide, tirzepatide, retatrutide and more. For pen users, try the peptide pen calculator.

25+ Peptides supported
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Quick Select Peptide

Precise Reconstitution

Enter your vial size and BAC water amount to instantly get concentration, inject volume, and syringe units.

25+ Peptides Covered

Pre-filled data for BPC-157, Semaglutide, Tirzepatide, Retatrutide, TB-500, and every major peptide.

Visual Syringe Guide

See exactly where to draw on a 100-unit insulin syringe with our fill bar indicator.

No Sign-Up Required

Everything runs in your browser. No account, no email, no tracking. Just free, instant calculations.

How the peptide calculator works

Our calculator uses standard pharmaceutical reconstitution formulas.

01

Enter vial size

Input your peptide vial size in mg (e.g. 5mg for BPC-157).

02

Add BAC water

Enter how much bacteriostatic water you added to the vial in ml.

03

Get your dose

Instantly see concentration, inject volume, and syringe units.

The formula

Concentration (mcg/ml) = (Vial mg × 1000) ÷ BAC water (ml) Inject volume (ml) = Desired dose (mcg) ÷ Concentration (mcg/ml) Syringe units = Inject volume (ml) × 100

All Peptide Calculators

Dedicated calculators pre-filled for every major peptide.

Peptide Reconstitution Calculator Peptide Pen Calculator mg to ml Calculator mcg to mg Calculator BAC Water Calculator Semaglutide Reconstitution Tirzepatide Reconstitution Retatrutide Calculator BPC-157 Dosage TB-500 Dosage BPC+TB-500 Blend Ipamorelin Dosage CJC-1295 Dosage CJC-1295 + Ipamorelin Sermorelin Dosage PT-141 Dosage AOD-9604 Dosage GHK-Cu Dosage Tesamorelin Dosage Melanotan II Dosage Cagrilintide Dosage MOTS-C Dosage SS-31 Dosage Hexarelin Dosage GHRP-6 Dosage Epithalon Dosage Selank Dosage Semax Dosage NAD+ Reconstitution HCG Reconstitution Molecular Weight Calculator
View all calculators

Frequently asked questions

It applies three standard formulas: concentration (mcg/ml) = vial mg × 1,000 ÷ BAC water ml; injection volume (ml) = desired dose ÷ concentration; syringe units = volume ml × 100 on a U-100 syringe. PepFormula shows these formulas openly and runs every calculation in your browser.
Yes. Every calculator is free, requires no sign-up, and runs entirely in your browser. Nothing you enter is transmitted or stored on a server.
There is no single required amount — the volume you choose sets the concentration. A 5mg vial with 2ml of BAC water gives 2,500 mcg/ml; with 5ml it gives 1,000 mcg/ml. More water means a weaker, easier-to-measure concentration, and the calculator shows the exact result for any amount.
A 5mg vial holds 5,000 mcg total: 20 doses at 250mcg, 10 doses at 500mcg, or 5 doses at 1,000mcg. The calculator shows the count for any vial and dose, plus how many days the vial lasts at 1 or 2 doses per day.
Reconstituted peptides are typically drawn with a U-100 (1ml) insulin syringe, marked in 100 units per ml. The calculator converts volume to units directly: 0.1ml = 10 units. Read the syringe at the bottom edge of the plunger, at eye level.
No. PepFormula is a math tool — it converts between vial sizes, water volumes, doses, volumes and syringe units, and it does not recommend doses. What a given dose should be is a question for a qualified healthcare professional and the official sources cited in our methodology.

Peptide Dosage Chart

Quick reference for all 25+ peptides — typical vial size, dose, BAC water, and syringe units in one printable table.

View Chart