Free tools
Calculators for the bench
Three small tools that remove the arithmetic most likely to go wrong when handling lyophilized peptides. Everything runs in your browser — nothing is sent anywhere.
Reconstitution calculator
Given a vial mass and a target concentration, work out how much bacteriostatic water to add and what each mark on the syringe delivers.
Open calculatorMolarity calculator
Convert between mass, molecular weight, volume and molar concentration — solve for whichever value you are missing.
Open calculatorUnit converter
Move between grams, milligrams, micrograms and nanograms, and between millilitres and microlitres, without a decimal-point mistake.
Open calculatorBackground reading
Guides behind this calculation
Reconstituting Lyophilized Peptides: A Lab Procedure With Worked Numbers
Three variables decide whether a stock is trustworthy — which diluent, how much of it, and how gently the cake is dissolved. Here is the…
Handling & storageReconstitution Maths: Three Formulas Behind Every Peptide Calculator
Concentration, draw volume, syringe units. Check any calculator by hand in a minute and see exactly where thousandfold errors creep in.
Molecule guidesMoles, Molarity and mg/mL: The Arithmetic Behind Peptide Concentrations
Three equations, one division each — plus the salt-content correction that quietly inflates every figure derived from a vial label.
Molecule guidesSyringes and Needles in Peptide Research: Units, Barrel Size and Dead Space
A syringe is a measuring instrument here. Graduation resolution and hub volume decide accuracy far more than needle gauge ever does.