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Measured on six things
Free peptide dosage calculator—dose to mL and U-100 units. No signup. Educational arithmetic only; not medical advice.
Security
52HTTPS and HSTS are in place, and there's no account system to leak. But no CSP, no frame protection, no Referrer-Policy, no SPF/DMARC, and no published security or audit page.
Screenshots
1 / 1
About this app
Free on-device peptide dosage calculator: enter vial or concentration details and get mL plus U-100 syringe markings—no sign-up. Educational arithmetic only—not medical advice.
Key features
- 1Dose-to-volume, volume-to-dose, and known-concentration modes with live U-100 syringe marking output.
- 2Step-by-step formula breakdown, conversion table, and CSV export for the current concentration.
- 3Blend, equal-portion, reverse-calculation, and supply/cost estimate tools.
- 4Local save (30 calculations) with JSON backup export and import; no account required.
Target customer profile
Drawn from the product itself, not from a survey.
Demographic
Health-conscious adults researching peptide protocols at home
Pain points
Confused by mg vs mcg vs mL and syringe unit conversions
Primary needs
A reliable, free calculator that shows the math step by step
Demographic
Fitness and wellness enthusiasts tracking body-composition goals
Pain points
Recalculating doses from scratch whenever vial strength or diluent changes
Primary needs
Save and reuse calculations, plus portion-count and supply estimates
Demographic
Lab technicians and research hobbyists handling multiple vials
Pain points
Manual math errors across blends, equal portions, and multi-vial plans
Primary needs
Blend, equal-portion, and reverse-calculation tools with checkable formulas
Demographic
Clinicians, pharmacists, and students learning dosing math
Pain points
Few transparent tools that expose formulas and reference standards
Primary needs
A teaching-friendly, unit-explicit calculator citing NIST and IUPAC definitions
Scout Review
Written by AI from measured evidence, scored out of 100.
Peptide Dosage Calculator is a free, no-sign-up browser tool that converts vial mass and final volume into concentration, mL, and U-100 syringe markings, with reverse and known-concentration modes, blend and equal-portion tools, supply estimates, and a step-by-step formula breakdown. It's fast (Lighthouse 99/100 mobile), visually coherent, and unusually transparent about its arithmetic — every result shows the concentration, volume, and marking steps. The weak spots are security headers (4/12 checklist points, no CSP or DMARC), contrast on the small grey text, and guide copy that reads like it was written for a search crawler. It's an educational arithmetic tool, not medical advice, and it says so repeatedly.
Measure by measure
Usability
68Inputs follow the arithmetic, results update live, and every field has a helper line. Save/backup/import is local-only and capped at 30. Copy and Print are unlabeled icon buttons.
Design
71Calculator-first layout with a coherent teal identity and a syringe illustration that anchors the result. Undercut by keyword-stuffed guide copy, faint preset chips, and five interchangeable tool cards.
Speed
88Lighthouse 99 mobile / 100 desktop, LCP 2.0s, CLS 0, TBT 46ms. A static calculator page that loads fast and stays fast — no heavy framework weight dragging it down.
Security
52HTTPS and HSTS are in place, and there's no account system to leak. But no CSP, no frame protection, no Referrer-Policy, no SPF/DMARC, and no published security or audit page.
Accessibility
79Lighthouse 96/100 with one failing audit: insufficient contrast. That matches the visual audit — small, light-grey body text and formula blocks. No WCAG statement, English only.
Growth
62Real, specific pain — mg/mcg/mL to U-100 units is genuinely error-prone — with a clear wedge: no sign-up, on-device math, saved calcs, exposed formulas. Very early (domain 0.1 yrs).
Improvement areas
- Security headers: no CSP, frame protection, Referrer-Policy, Permissions-Policy, SPF, or DMARC.
- Contrast on body text and monospace formula blocks fails the one Lighthouse accessibility audit.
- Guide copy repeats the product name in nearly every sentence, hurting readability.
- Copy and Print are unlabeled icon-only buttons; preset chips and captions are faint.
Design & Usability
The design is the strongest part of the product: a calculator-first layout where the tool sits directly under the headline, a restrained teal identity, and a syringe illustration that turns '10 units' into something you can actually see. Inputs are numbered and ordered the way the arithmetic works, results update as you type, and every field carries a helper line explaining what the value means. Where it slips is below the fold — the guide copy repeats 'the peptide dosage calculator' in nearly every sentence, the preset chips and captions are faint enough to miss, and the five 'Explore the tools' cards are identical white boxes. Usability is solid for a utility: no sign-up, live output, a local save system with JSON backup and import. The 30-calculation cap and the unlabeled Copy/Print icon buttons are the rough edges.
Speed & Security
Speed is the standout measured result: Lighthouse 99 on mobile and 100 on desktop, LCP 2.0s, CLS 0, TBT 46ms. It's a static calculator page and it behaves like one — no framework weight, no layout shift, no waiting. Security is the weak flank. HTTPS is enforced and HSTS is set, and because there's no account system there are no stored credentials to leak. But the HTTP probe found no CSP, no frame protection, no X-Content-Type-Options, no Referrer-Policy, no Permissions-Policy, and no SPF or DMARC records — 4 of 12 checklist points. There's also no security page, no audit, and no disclosure policy. For a no-login arithmetic tool the blast radius is small, but the headers are a ten-minute fix that hasn't been made.
Accessibility & Growth
Accessibility scores 96/100 on Lighthouse with exactly one failing audit: insufficient contrast between background and foreground. That lines up with the visual audit, which flagged small, light-grey body text and monospace formula blocks that are tiring over long sections. There's no WCAG conformance statement and the site is English-only, so the automated score is the ceiling of what's verified, not the floor. Growth is a judgement on the idea: the problem is real and specific — converting mg/mcg/mL into U-100 syringe markings is exactly where people make arithmetic errors — and the wedge is concrete. No sign-up, on-device math, saved calculations, blend and equal-portion and reverse tools, and formulas you can check line by line. Against Omni Calculator (broad but no saved calcs or syringe comparison) and PepCalc (install-based), that's a defensible position. The limit is that the moat is thin: the math is public, the UI is copyable, and the domain is 0.1 years old with no traction signals in the collected evidence.
Conclusion
If you're doing peptide reconstitution math at home and want to see the steps instead of trusting a black box, this does that job well and costs nothing. The transparency is the actual product — the formula breakdown and the conversion table are what separate it from a generic calculator. Before you rely on it, know what it isn't: it doesn't recommend doses, it doesn't verify your label, and it stores nothing outside your browser unless you export a backup. Check your own syringe markings against the precision selector, and treat the output as arithmetic you still have to sanity-check.
Suggestions for improvement
- Add CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy headers — cheap hardening for a static page.
- Publish SPF and DMARC records for the domain; the probe found neither.
- Fix the contrast on body copy and monospace formula blocks to clear the one failing Lighthouse audit.
- Rewrite the guide copy to stop repeating 'the peptide dosage calculator' in every sentence — it hurts readability and reads as stuffing.
Alternatives comparison
Named competitors, point by point. Nobody paid to appear here or to be left out.
 Peptide Dosage Calculator |  Omni Calculator — Peptide Calculator | PepCalc | |
|---|---|---|---|
| Price | Free, no sign-up | Free with ads; paid ad-free tier | Free app with in-app purchases |
| Saved calculations | Yes — 30 local, JSON backup/import | No persistent saved calculations | In-app history, install required |
| U-100 syringe marking visualization | Yes — syringe scale with unit marker | Numeric output only | Yes — syringe graphic in app |
| Formula transparency | Full step-by-step breakdown shown | Formula explanation per calculator | Result-focused, limited step detail |
| Install required | No — browser only | No — browser only | Yes — mobile app |
| Blend / equal-portion / supply tools | Yes — all three plus cost estimate | Separate calculators, not integrated | Single-vial reconstitution focus |
Omni Calculator — Peptide Calculator
A broad scientific and everyday calculator library that includes peptide and reconstitution formulas; useful for quick one-off math but without saved calculations or syringe-marking comparisons.
PepCalc
A popular mobile-focused peptide reconstitution and dosage calculator app aimed at users who want an app-style experience on their phone, typically requiring an install rather than a browser.
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