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Best Peptide Calculator 2026:
16 Free Tools, No Signup

The complete 2026 reference for free peptide calculators. Reconstitution math, dose conversions, BAC water ratios, half-life decay curves, GLP-1 titration schedules, IGF-1 optimal ranges, body composition, and stack interaction screening — all free, all in one place.

Updated May 2026. By the team at MyProtocolStack.

Open the calculator hub →Read the PeptIQ comparison

The Complete Calculator List

Reconstitution Calculator
Concentration + insulin syringe units from vial size + BAC water
Core
Dosing Calculator
Calculate exact units to draw for any target dose
Core
Reverse Calculator
Work backwards from desired units to vial + BAC ratios
Core
Unit Converter
mcg / mg / IU conversions with peptide-specific ratios
Core
Vial Duration Calculator
How long a single vial will last at your dose schedule
Inventory
Cost Calculator
Per-dose + monthly + annual cost across your stack
Inventory
BAC Water Calculator
Optimal bacteriostatic water volume per peptide
Reconstitution
Half-Life Calculator
Active drug level over time across multiple doses
Pharmacokinetics
GLP-1 Titration Schedule
Standard semaglutide / tirzepatide / retatrutide ramp schedules
GLP-1
GLP-1 Dose Converter
Convert between semaglutide and tirzepatide equivalent doses
GLP-1
IGF-1 Optimal Range
Your optimal IGF-1 by age + active GH protocol
Bloodwork
TDEE Calculator
Total Daily Energy Expenditure for cut/bulk planning
Body Comp
Protein Target Calculator
Daily protein by lean mass for muscle preservation
Body Comp
Body Fat % Calculator
Body fat estimate from circumferences (Navy / Jackson-Pollock)
Body Comp
Lean Mass Calculator
Lean body mass + DEXA visceral / subq fat tracking
Body Comp
Stack Interaction Checker
Cross-reference peptide + supplement stacks for known interactions
Safety

MyProtocolStack vs Other Peptide Calculator Apps

MyProtocolStack vs PeptIQ vs PepTracker vs Smart Peptide Tracker — calculator feature comparison
CalculatorMyProtocolStackPeptIQPepTrackerSmart PT
Reconstitution✓✓✓✓
Dosing✓✓✓✓
Unit Converter✓✓✓—
Vial Duration✓✓——
Cost Calculator✓✓——
Reverse Calculator✓———
BAC Water Optimizer✓———
Half-Life Decay Curve✓———
GLP-1 Titration Schedule✓———
GLP-1 Dose Converter✓———
IGF-1 Optimal Range✓———
TDEE / Protein / Body Fat✓———
Stack Interaction Checker✓———
Free, no signup required✓✓—✓
Web app (not mobile-only)✓———

MyProtocolStack ships the broadest free calculator set in the peptide space as of 2026 — 16 tools versus PeptIQ's 5, PepTracker's 3, and Smart Peptide Tracker's 2. We're also the only one of these that's a real web app (not mobile-only) — useful when you're standing at a bench reconstituting a vial and want a real screen.

FAQ

Is MyProtocolStack's peptide calculator really free?
Yes. All 16 calculators are free with no signup required. Account-free use lets you run the math without committing. The free Explorer tier of MyProtocolStack also includes lab tracking, dose logging, and the full peptide library.
How is this different from PeptIQ's calculator?
PeptIQ ships 5 calculators in their app: Reconstitution, Dosing, Unit Converter, Vial Duration, and Cost. MyProtocolStack ships 16 — adding Reverse Calculator, Half-Life, GLP-1 Titration, GLP-1 Dose Converter, IGF-1 Optimal Range, BAC Water, TDEE, Protein Target, Body Fat %, Lean Mass, and Stack Interaction Checker. Both are free; MyProtocolStack is the deeper toolkit.
Do I need to know the BAC water amount before using the reconstitution calculator?
No. The MyProtocolStack BAC Water Calculator suggests an optimal BAC volume based on the peptide and target dose. You can also reverse-calculate: enter your desired insulin syringe units and the calculator works back to the right BAC ratio.
Can I use these calculators for GLP-1 medications?
Yes. We have dedicated GLP-1 Titration Schedule and GLP-1 Dose Converter calculators that handle semaglutide, tirzepatide, and retatrutide. Standard ramp schedules are pre-loaded; you can also customize.
Are calculator outputs medical advice?
No. These calculators perform mathematical conversions on user-entered values — they do not diagnose, prescribe, or recommend treatment. Always confirm any peptide protocol with a qualified healthcare provider before injecting.
Does the calculator save my history?
In the standalone calculator pages, no — each session is local and ephemeral. If you want to save your reconstitution and dose history across sessions and devices, the free MyProtocolStack Explorer account stores everything in a personal dashboard.

Want all 16 calculators in one place?

Free Explorer account adds dose logging, lab tracking, biomarker dashboard, and your peptide history — all on web and mobile.

Create a free account →

MyProtocolStack is a tracking and education platform. Calculator outputs are mathematical conversions of user-entered values; they do not diagnose, prescribe, or recommend treatment. Always consult a qualified healthcare provider before starting any peptide protocol. Pricing and feature comparisons accurate as of May 2026.