Free browser tool
Free Peptide Calculator
Enter a vial amount, added liquid volume, desired amount, and syringe size to calculate a visual syringe-unit result. PeptideCalc performs math on the values you provide; it does not determine whether any input is appropriate.
Calculator inputs stay in your browser and are not included in website analytics. See the privacy policy for the complete website and app data practices.
Need saved records and schedules? The $4.99 PeptideCalc iOS app adds protocols, reminders, dose logs, inventory, and offline access with no recurring subscription.
What this peptide calculator does
The web calculator is a single-vial conversion tool. It combines four values to show a syringe marking for the amount you entered:
- Vial content in milligrams
- Added liquid volume in milliliters
- A user-entered amount in milligrams or micrograms
- A 0.3 mL, 0.5 mL, or 1.0 mL syringe scale
The free website does not store protocols, support multi-compound blends, or create schedules. Those are separate features of the iPhone and iPad app.
Calculation method
The tool converts all mass values to milligrams, then applies the following relationships. The formulas explain the software output; they are not instructions for choosing any input.
1. Concentration
vial content (mg) ÷ liquid volume (mL) = concentration (mg/mL)
2. Volume represented by the entered amount
entered amount (mg) ÷ concentration (mg/mL) = draw volume (mL)
3. Syringe marking
draw volume (mL) ÷ mL per displayed unit = syringe units
Verify before relying on a result
- 1Check the source label and independently confirm every value before entering it.
- 2Keep mass and volume units consistent; the web tool converts a microgram entry to milligrams before calculating.
- 3Confirm that the result fits the syringe and scale you selected. The website does not warn when a requested volume exceeds one syringe.
- 4Do not use the result to choose a medication, amount, concentration, schedule, or administration method.
Peptide calculator questions
- Is the online peptide calculator free?
- Yes. The browser calculator is free and does not require an account. The iOS tracker is a separate $4.99 one-time purchase in the US App Store as of August 10, 2026.
- Does it recommend a dose or schedule?
- No. It only converts the values a user enters. PeptideCalc does not prescribe treatment, select medications, recommend amounts, or create an appropriate schedule.
- Can the website calculate a peptide blend?
- No. The free web calculator handles one vial amount at a time. The iOS app supports user-entered multi-compound workflows.
- Is PeptideCalc available for Android?
- No. The native app supports iPhone and iPad on iOS or iPadOS 18.6 and later. The browser calculator works on modern web browsers.
Move from a one-time calculation to an organized record
Read how the iOS app handles user-entered protocols, schedules, injection-site history, inventory, and insights, or open the App Store listing for current compatibility and pricing.