Biology 101
Your one stop shop for biology.
Everything you need, from a homework problem set to a research project. Most of it runs right here — and for the rest, we point you to the best tool for the job.
Start here
All 76 →- AlphaFold Server
Predicts protein, DNA, RNA and ligand complexes with AlphaFold 3.
ExternalGoogle DeepMindSign-in - Molarity calculator
Convert between mass, molar concentration and volume for a solution.
Built inNo upload - Fiji / ImageJ
The standard for scientific image analysis, with a plugin for almost everything.
ExternalOpen sourceDesktop install - Clustal Omega
Multiple sequence alignment that scales to thousands of sequences.
ExternalEMBL-EBIFree
Laboratory calculators
Dilutions, molarity, buffers and reagent maths. All of it runs here, and every result shows the formula behind it.
- Molarity calculator
Convert between mass, molar concentration and volume for a solution.
Built inNo upload - Molecular weight calculator
Compute molar mass from a chemical formula, including hydrates.
Built inNo upload - Dilution calculator
Work out how much stock and diluent to combine for a target concentration.
Built inNo upload - Serial dilution calculator
Plan a dilution series and get the transfer volume for every step.
Built inNo upload
Statistics and plotting
Choosing the right test, and showing the data honestly once you have. Effect sizes and distributions, not bare p-values.
- t-test calculator
Compare two groups and get the effect size and interval, not just a p-value.
Built inNo upload - Multiple testing correction
Adjust a list of p-values by Benjamini–Hochberg or Bonferroni.
Built inNo upload - One-way ANOVA
Compare three or more groups, with variance explained and every pair tested.
Built inNo upload - Correlation and regression
Pearson or Spearman with a confidence interval on r, plus a fitted line.
Built inNo upload
Cell & developmental biology
Growth rates, viability and seeding density, plus the databases people actually use for model organisms.
- OD600 calculator
Convert optical density to cell density and plan culture dilutions.
Built inNo upload - Haemocytometer calculator
Turn a chamber count into cells per millilitre, with the counting error stated.
Built inNo upload - Cell seeding density calculator
Work out the suspension and medium to seed a plate or flask at a target density.
Built inNo upload - ZFIN
The zebrafish model organism database: genes, lines and expression.
ExternalZFINFree
Browse by category
- Laboratory calculators10
Dilutions, molarity, buffers and reagent maths for the bench.
- Molecular biology10
Primers, PCR, cloning, restriction analysis and sequence manipulation.
- Bioinformatics8
Sequence formats, alignment, motifs and database lookups.
- Protein tools8
Peptide properties, composition, isoelectric point and structure viewing.
- Cell biology6
Culture planning, growth rates, viability and seeding density.
- Imaging & microscopy9
Fluorophore spectra, filter sets, FRET pairs and image analysis.
- Statistics and plotting24
Significance testing, regression and publication-ready figures.
- Laboratory utilities1
Unit conversion, timers, protocols and everyday lab housekeeping.