Lab calculators
The everyday maths of a chemistry lab: making solutions, diluting them, measuring them, and the properties of a peptide from its sequence.
Peptide sequences
- Peptide sequence properties
Molecular formula, mass, pI, net charge and extinction coefficient from a sequence.
- Isoelectric point calculator
pI and net charge compared across six published pKa sets.
- Extinction coefficient calculator
ε at 280 and 205 nm, and the absorbance of a 1 mg/mL solution.
Solutions
- Molecular weight calculator
Molar mass and relative formula mass (Mr) from a chemical formula, hydrates included.
- Molarity calculator
Mass, volume and concentration of a solution; mg/mL to molar conversion.
- Dilution calculator
C1V1 = C2V2 for a single dilution, or a serial dilution series tube by tube.
- Buffer calculator
Phosphate, Tris, HEPES, MES, acetate and carbonate buffers at a set pH, and PBS.
Measurement
- Beer–Lambert law calculator
Absorbance to concentration, or any one of A, ε, path length and concentration.
- RPM to RCF calculator
Centrifuge speed in RPM to force in × g, and back.