Biology

Most used

• AP Bio Score Calculator (US Exam)Turn your multiple-choice count and your six free-response scores from the US AP Biology exam into a predicted 1–5 score.

All, A–Z

• Bacterial Growth CalculatorFinal cell count after a number of binary fissions — the starting count doubled once per generation.
• Chance of Blue Eyes — Punnett SquareThe chance of a blue-eyed child, from both parents' gene pairs at the two classical eye-colour genes.
• Hardy-Weinberg CalculatorHeterozygote frequency 2pq from the dominant allele frequency p, with p² and q² alongside.
• Michaelis-Menten CalculatorEnzyme reaction velocity from Vmax, the Michaelis constant Km and the substrate concentration.
• Surface Area to Volume Ratio CalculatorThe surface-area-to-volume ratio of a spherical cell — 3 divided by its radius.
• Total Magnification CalculatorTotal magnification of a compound microscope — the objective lens times the eyepiece.