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Calculators for chemistry and biology.
Free calculators that show their working, plus reference data for the lab and the classroom.
Browse tools(01)
Popular tools
Calculate, convert and measure.
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The periodic table
Atomic mass, electron configuration, oxidation states and isotopes for all 118 elements.
118 elements
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Reference data
Elements, enzymes, amino acids and codons.
118
Elements
Mass, electron configuration and isotopes for every element.
219
Restriction enzymes
Recognition sites, cut positions and sticky or blunt ends.
20
Amino acids
Structures, one- and three-letter codes, and side-chain properties.
64
Genetic code
Codons, the amino acids they code for, and start and stop signals.
t½
Isotopes
Half-lives, decay modes and natural abundance for common isotopes.
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h-index
Calculate your h-index and i10-index from your citation counts, with each paper ranked by citations on a chart.
Calculate your h-indexFor students and teachers
In the classroom
Check your coursework, with each calculation shown step by step.
- Periodic table
- Electron configuration
- Molecular weight
- Scientific notation
- Amino acids
For lab staff
At the bench
Prepare solutions and samples, with molarity, centrifuge speeds, restriction cut sites and buffer recipes.
- Restriction enzymes
- Molarity
- Centrifuge (RCF)
- PCR master mix
- Protocols and buffers