VialMath: Peptide Calculator

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Everyone
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About this app

VialMath turns three numbers you already have into the reading on your syringe.

Enter the amount in the vial, the water you added and the dose your prescriber gave you. VialMath shows how many units to draw, the volume in mL, the concentration, and how many doses the vial holds, with a picture of the syringe filled to the line.

WHAT IT DOES
• Units to draw on U-100 syringes (1 mL, 0.5 mL and 0.3 mL), U-40, and tuberculin syringes
• Dose in mcg or mg, volume in mL, concentration in mcg per mL, doses per vial
• Flags a dose that is the whole vial or more (a likely mcg / mg mix-up), a draw bigger than the syringe holds, and a draw too small to measure well
• Share a calculation as text
• Save calculations: name them, reopen them later with every number filled in, and keep a dated list

WHAT IT DOES NOT DO
• It never suggests, adjusts or recommends a dose. You enter the dose; VialMath does the arithmetic.
• No compound list, no dose charts, no presets.
• No account, no ads, no tracking. Your calculations stay on your phone.

PRICING
The calculator is free, with no limits. Saving calculations is a one-time purchase, not a subscription.

IMPORTANT
VialMath is not a medical device and does not diagnose, treat, cure, or prevent any medical condition. It is a calculator: it does arithmetic on the numbers you enter and does not give medical advice. Check every result, and ask your physician or pharmacist about your medication, dose or treatment.

From Techlathery LLC, the makers of Pepathary.
Vial, water and your dose in, syringe units out. Private and offline.
Updated on
Oct 23, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Financial info and Device or other IDs
  • Data is encrypted in transit

What’s new

VialMath 1.0.3
- Fixes Unlock saving: it now opens Google Play's purchase screen and shows the price. Before, it could sit on "Opening the store" and never get there.
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Everyone
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App support

About the developer
TECHLATHERY LLC
hello@pepathary.app
326 E Grand River Ave Williamston, MI 48895-1418 United States
+1 517-292-0071