Calculators

The arithmetic, done for you

Both run in your browser; nothing you type is sent anywhere. They use the same constants as the primers and the tables.

Solution preparation

Mass to weigh = concentration × volume × molar mass ÷ purity, the multiplication in Making a solution to a target concentration. Give the solid as a formula (C, H, N, O, S) or as a molar mass in g/mol; use the molar mass of the form in the bottle (hydrate, salt).

Solid: formula or molar mass (g/mol)

C₆H₁₂O₆, average molar mass 180.156 g/mol

Target concentration

Final volume

Stated purity (%)

Mass to weigh: 4.504 g
Amount of substance: 25.00 mmol

m = 0.1000 mol/L × 0.2500 L × 180.156 g/mol = 4.504 g

Sequence mass

The sum of the residues plus one water for the free termini, the arithmetic in The arithmetic of chains. Unmodified chains only: no acetylation, amidation, phosphorylation, bridges or cyclisation, and only the twenty standard residues.

Sequence (one-letter codes)

Spaces, digits and dashes are ignored. 3 residues.

Monoisotopic mass: 203.09061 Da
Average mass: 203.198 Da
[M+H]+ (monoisotopic): 204.09788
Molecular formula: C₇H₁₃N₃O₄

Residue	Count	Mono each	Subtotal
Glycine (Gly)	2	57.02146	114.04293
Alanine (Ala)	1	71.03711	71.03711
Water (termini)	1	18.01056	18.01056