Biology
Mutation Frequency Calculator
Express how often a mutant appears in a cell population as a simple frequency and per-million-cells rate.
Your inputs
Change any value to update the result instantly.
Mutation frequency
0
Per million cells
0.12 mutants
Per 10⁸ cells (common reporting unit)
12
Mutants counted
12
Frequency (mutants observed ÷ cells plated) is not the same as mutation rate per generation — rates need fluctuation analysis (Luria–Delbrück) because early mutants leave many descendants.
What this calculator does
Reports how often a mutant appears in a population as a frequency and per-million rate.
What your result means
The frequency is mutants observed divided by cells plated; per-million rescales it for comparison.
Formula and working
mutation frequency = mutant colonies ÷ total cells in the culture
- 1
Collect the inputs
Mutant colonies counted = 12; Total cells plated = 100,000,000 cells
- 2
Apply the formula
mutation frequency = mutant colonies ÷ total cells in the culture
- 3
Result
Mutation frequency = 0
Frequently asked questions
Symbols and assumptions
- f
- Mutation frequency = mutants ÷ total cells
- • Mutant colonies are counted on selective medium from a known plated population.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • Frequency is not the per-generation mutation rate; that requires fluctuation analysis (Luria–Delbrück).
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Report a mistake or request an improvement
Tell us if a formula, unit, explanation, or result needs attention. Your message will include this calculator’s name and page.
Related calculators
Allele Frequency Calculator
Estimate allele frequencies p and q in a population from observed genotype counts (AA, Aa, aa).
Dihybrid Cross Calculator
Predict offspring ratios for a two-gene cross, assuming the genes assort independently.
DNA to mRNA Converter
See what a coding DNA sequence becomes after transcription and translation: mRNA length, codons, amino acids and rough protein mass.
Hardy-Weinberg Equilibrium Calculator
From one allele frequency, see the genotype frequencies a population would show under Hardy-Weinberg equilibrium.
Punnett Square Calculator (Monohybrid Cross)
Predict offspring genotype and phenotype ratios for a single-gene cross between any two genotypes.
Trihybrid Cross Calculator
Predict offspring ratios for a three-gene cross, assuming independent assortment of all three genes.