Biology calculators
6 free tools
Handy calculators for the questions that come up in genetics and cell biology — cross two genotypes, check a population against Hardy-Weinberg, time a growing culture, transcribe DNA into mRNA, measure GC content, or work out what your microscope is really showing you.
Calculate a culture's doubling time and number of doublings from start and end counts over a set time.
Turn a DNA sequence into its complementary strand and the transcribed mRNA, swapping every T for a U.
Compute the percentage of G and C bases in a DNA sequence, plus each base count and the total length.
Solve the Hardy-Weinberg equation from an allele frequency, or estimate allele frequencies from genotype counts.
Work out total microscope magnification from the objective and eyepiece, plus the field of view diameter.
Cross two parent genotypes to see the Punnett square plus the genotype and phenotype ratios for a single gene.
Frequently asked questions
Who are these biology calculators for?
Students and teachers mostly, plus anyone who wants to check a genetics problem or a quick lab calculation without pulling out a textbook. Each tool sticks to the standard formula you'd meet in a first course.
Do these handle more than one gene at a time?
The Punnett square here covers a single gene (a monohybrid cross). Dihybrid and larger crosses multiply out from the same logic, but they need a bigger grid than this tool draws.
Can I paste a real sequence into the DNA tools?
Yes. The transcription and GC content tools ignore spaces and line breaks and uppercase everything, so you can paste a sequence straight in. They only accept A, C, G and T, so they'll flag anything unexpected.