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
What makes a stock reliable comes down to three choices: the diluent, the volume, and how gently the cake goes into solution. The method…
Handling & storageReconstitution Maths: Three Formulas Behind Every Peptide Calculator
Concentration, volume to draw, syringe units. Verify any calculator by hand in sixty seconds and see precisely where thousandfold slips…
Molecule guidesMoles, Molarity and mg/mL: The Arithmetic Behind Peptide Concentrations
Three formulas, each a single division — plus the correction for salt content that silently overstates anything calculated from a vial…
Molecule guidesSyringes and Needles for Peptide Labs: Unit Scales, Barrel Choice, Hub Losses
In this context a syringe is an instrument for measuring. How finely it is graduated, and how much stays in the hub, matter far more than…