Peptide Calculators and Research Tools
41 free, evidence-based calculators, checkers, and reference tools for peptide research. All tools are for educational and laboratory use only.
Calculators & Converters
6 toolsCost-Per-Milligram Calculator
Compare vendors and products side by side. Find the best value per milligram and per typical dose.
Unit Converter
Convert between mg, mcg, IU, mL, units, and molar concentrations. Includes peptide-specific IU conversions.
Molarity Calculator
Calculate molar concentrations, mass from molarity, and dilutions with preset molecular weights for common peptides.
Aliquot Calculator
Calculate how many aliquots you can make from a reconstituted vial. Plan storage and minimize freeze-thaw cycles.
Order Quantity Estimator
Calculate exactly how many vials to order for your full protocol. Add multiple peptides and account for waste.
Salt Form Converter
Convert between peptide salt forms (TFA, acetate, HCl, free base). See how counterions affect actual peptide content.
Scientific Tools
22 toolsMolecular Weight Calculator
Calculate molecular weight from an amino acid sequence. See residue count and full composition breakdown.
Peptide Property Calculator
Calculate pI, net charge, GRAVY score, extinction coefficient, and more from any amino acid sequence.
Sequence Visualizer
Color-coded visualization of amino acid sequences by property type. Supports single and three-letter codes.
Solubility Predictor
Predict peptide solubility from amino acid composition and get reconstitution solvent recommendations.
Peptide Purity Calculator
Calculate actual peptide content from label amount, accounting for HPLC purity, salt form counter-ions, and water content.
Net Peptide Content Calculator
Advanced calculator that accounts for purity, counterion/salt form, water content, and residual solvent to determine true active peptide content from COA values.
Mass Spec Match Calculator
Compare expected and observed molecular masses. Calculate error in Da and ppm, assess match quality, and identify possible modifications.
HPLC Purity Interpreter
Enter HPLC peak areas to calculate purity percentage, identify impurity types, and get a quality assessment with visual breakdown.
Serial Dilution Calculator
Calculate step-by-step serial dilution series. Get transfer volumes, diluent volumes, and concentrations for each tube.
Hydrophobicity Plotter
Visualize hydrophobic and hydrophilic regions across a peptide sequence using Kyte-Doolittle, Hopp-Woods, or Eisenberg scales.
Modification Mass Calculator
Calculate mass changes for post-translational and synthetic modifications. Supports acetylation, phosphorylation, PEGylation, isotope labeling, and more.
Disulfide Bond Calculator
Detect cysteines in a peptide sequence and analyze possible disulfide bond pairings, complexity, and mass changes.
Extinction Coefficient Calculator
Calculate molar extinction coefficient from amino acid sequence. Estimate protein concentration from UV absorbance.
Amino Acid Composition
Analyze amino acid composition from a peptide sequence. See counts, percentages, property groups, and molecular weight contributions.
Charge-at-pH Calculator
Calculate net charge at any pH using Henderson-Hasselbalch equation. Visualize full titration curve with isoelectric point.
Fragment Mass Calculator
Calculate b-ion and y-ion fragment masses for MS/MS analysis. Supports multiple charge states and oxidized Met.
Solvent Compatibility Checker
Determine which solvents are safe for dissolving specific peptide types based on their chemical properties.
pH Buffer Calculator
Calculate buffer compositions for any target pH. Get acid/base ratios, buffer capacity, and preparation instructions.
Concentration from UV Absorbance
Calculate peptide concentration from UV-Vis absorbance at 280nm using Beer-Lambert law with dilution correction.
Assay Prep Calculator
Plan assay plate layouts, calculate dilution volumes, and estimate stock peptide needed for ELISA, BCA, and bioactivity assays.
Sequence Length Calculator
Analyze peptide sequence length, classification (oligopeptide, polypeptide), physical dimensions, and size properties.
Peptide Structure Renderer
Visualize peptide backbone structure with amino acid residues color-coded by chemical property.
Safety & Interactions
2 toolsRegulatory & Compliance
2 toolsResearch & Education
8 toolsEvidence Grade Calculator
Rate the quality of evidence behind any peptide claim using a structured GRADE-inspired framework.
COA Explainer
Understand every field on a Certificate of Analysis. Learn what good results look like and red flags to watch for.
COA Red Flag Checker
Interactive checklist to evaluate whether a Certificate of Analysis is legitimate. Get a trust score.
Peptide Label Decoder
Paste a peptide vial or product label and get a plain-language explanation of every element.
Glossary
Comprehensive glossary of peptide terminology, abbreviations, and concepts explained in plain language.
Peptide Price Index
Compare typical per-mg pricing across the market. Sortable by price, value rating, and category.
Peptide Comparison Matrix
Build custom side-by-side comparison tables for any peptides. Select fields to compare across your choices.
Peptide Batch Comparison
Compare COA data across different vendors and batches. Identify the best quality and value with color-coded scoring.
Every tool here is for laboratory research use only. None of them computes, plans or presents an amount of material for administration, and nothing on this site is medical advice.