Free Peptide Tools & Calculators
Every PepPal calculator is free, requires no signup, and handles the math the way researchers and practitioners actually need it — clean syringe units, verified formulas, and saved calculations across sessions when you sign in. Built and maintained by Garret Grant from primary literature, Finnrick testing data, and hands-on vial math.
Built and maintained by Garret Grant - Founder & Lead Researcher, B.S. Engineering, UCLA.
Last updated: April 2026
Human-researched and AI-assisted with full editorial review. I verify sources, rankings, and final judgments personally. See methodology.
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This is the full PepPal tool library. Most peptide calculators on the web only handle single-vial reconstitution — one peptide, one dose, one syringe. Real-world workflows also involve multi-peptide blends, cycle planning, cost-per-mg comparisons, and titration tracking. PepPal is building the calculators for those workflows too. Active tools are below. The roadmap further down shows what's shipping next — vote for priority by emailing feedback through the about page.
Contents
Active Tools
Peptide Reconstitution Calculator
Calculate exact syringe units for any lyophilized peptide — enter vial mg, BAC water volume, and target dose to get concentration and U-100 units.
Best for: Single peptide in a single vial. Tirzepatide, Semaglutide, BPC-157, Retatrutide, CJC-1295, and every other single-compound vial.
Open Reconstitution CalculatorPeptide Stack & Blend Calculator
Per-component dose math for multi-peptide vials. Enter each peptide's mg, total BAC water, and target draw to get exact per-component concentration and syringe units.
Best for: Pre-blended vials (GLOW, KLOW, Wolverine, CJC-1295/Ipamorelin) and custom blends.
Open Stack CalculatorWhich Calculator Should You Use?
Tool Roadmap — What's Shipping Next
Everything below is in active development or queued. Ship dates depend on user priority — if a specific tool would unblock your workflow, mention it through the feedback link on the about page. Roadmap order below reflects current planning, not commitment.
Peptide Cost Calculator
What it does: Calculate cost-per-mg and cost-per-dose across suppliers for the same peptide. Enter vial mg, vial price, and your daily dose — get monthly cost, yearly cost, and supplier ranking. Pulls current Peptide Partners and Orbitrex pricing where available.
Why it's useful: Most peptide users don't calculate the true cost of a protocol until they're three months in. Cost-per-mg varies 2–4× across suppliers for identical peptides. This tool surfaces that before purchase.
Target queries: peptide cost calculator, peptide price calculator, peptide cost per mg, how much do peptides cost per month
Peptide Cycle Planner
What it does: Build a weekly injection schedule across multiple peptides. Set each peptide's frequency (daily, M/W/F, weekly), dose, and cycle length — get a visual 8–12 week calendar showing every injection day and when to cycle off.
Why it's useful: Multi-peptide protocols get hard to track manually. Wolverine stacks are daily. CJC-1295 DAC is weekly. Tirzepatide is weekly with titration. A single-view planner prevents missed doses and wrong-day injections.
Target queries: peptide cycle planner, peptide schedule calculator, peptide protocol planner, peptide cycle calculator
GLP-1 Titration Calculator
What it does: Generate the full titration schedule for Tirzepatide, Semaglutide, or Retatrutide based on FDA-approved or clinical trial titration timelines. Enter your starting vial size and water volume — get every escalation step with exact syringe units for each phase.
Why it's useful: GLP-1 titration is the single most common peptide workflow on the web, and also the most commonly miscalculated. Every phase changes the syringe units, and users routinely skip or double-dose during escalation. A dedicated titration tool solves this cleanly.
Target queries: tirzepatide titration calculator, semaglutide titration schedule, retatrutide dose escalation, GLP-1 titration calculator, Mounjaro dose calculator, Zepbound dose calculator
BAC Water Volume Optimizer
What it does: Given a vial size and a target syringe unit draw (e.g., "I want every dose to be exactly 10 units"), calculate the exact BAC water volume required. Reverses the standard reconstitution math.
Why it's useful: Most dosing errors come from awkward volumes — 7.5 units, 12.5 units, non-round fractions. Forcing a clean 10, 20, or 25 unit draw by adjusting water volume eliminates that error class.
Target queries: BAC water calculator, bacteriostatic water peptide calculator, how much BAC water, peptide dilution calculator
Peptide Interaction Checker
What it does: Check whether two or more peptides can be co-reconstituted in the same vial, co-injected separately, or should be kept apart entirely. Flags stability conflicts (e.g., short-stability peptides that limit the combined vial's usable window) and pathway conflicts (e.g., antagonistic mechanisms).
Why it's useful: Community blend protocols often combine peptides that shouldn't actually share a vial — either because the shortest-stability component limits the whole blend, or because the pathways conflict. This tool surfaces those conflicts before reconstitution, not after.
Target queries: peptide interaction checker, can you stack peptides, peptide compatibility, peptide blend safety
Cycle Cost Estimator
What it does: End-to-end cost projection for a named protocol. Pick a stack (Wolverine, GLOW, KLOW, CagriSema, full GLP-1 titration), select a supplier, and get total cost for a full cycle including vials, BAC water, syringes, and alcohol swabs.
Why it's useful: Pulls together the cost calculator and cycle planner into one answer: "How much does a 12-week GLOW cycle actually cost?"
Target queries: peptide cycle cost, how much does a peptide stack cost, peptide protocol cost calculator
Missing something? If there's a calculation you'd find genuinely useful that isn't on the list, send it via the feedback form. Tool priority is driven by user requests — the roadmap order above is tentative, not locked.
How PepPal Tools Are Built and Verified
Every tool on this page is built and personally verified by Garret Grant — founder of PepPal, B.S. Engineering from UCLA, independent researcher. The math in every calculator is cross-checked against primary literature, clinical trial publications, and worked examples from the Peptide Dosing Protocols library. When a tool references dosing ranges, the ranges come from Tier 1–3 sources (clinical trials, systematic reviews, FDA filings) — never supplier marketing pages. When a tool references supplier data, it comes from Finnrick Analytics testing. Read the methodology page for the full source tier hierarchy and review process.
All PepPal tools are for tracking and calculation purposes only. Not medical advice. Always consult qualified professionals for any health-related decisions.