The lab,
made precise.
DNA, PCR, cell culture and reaction chemistry – precise lab tools for research and study. Free, instant, and private.
Jean Borg
Founder & developer · How I build these →
Biology · example
DNA conc.
Concentration
47.5 ng/µL
A260 0.95 × 50 × dilution 1
13
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DNA & nucleic acids
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Every lab answer
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No black boxes. Every tool shows the exact method or formula it used – so you can check it, trust it, and learn it.
Try the DNA Concentration ›# Dilution
C₁V₁ = C₂V₂
# Arrhenius
k = A·e^(−Eₐ / RT)
# Doubling time
td = ln 2 / growth rateQuestions
Biology questions.
Are these biology calculators really free?
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Yes – every one is completely free, with no sign-up, no account, and no paywalled results.
How accurate are the results?
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They use standard lab equations and are accurate for research and study – always verify against your own protocol.
Is my data saved anywhere?
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No. Every calculation runs locally in your browser – nothing you enter is stored or sent anywhere.
Can you add a biology calculator I need?
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Yes – request it via the contact page and it can be built and made live fast, free of charge.
The developer
Built by a real person.
Jean Borg
Founder & developer · freecalculators.pro · Malta
I build and maintain every calculator on this site myself, from my desk in Malta. No faceless company and no outsourced content – each tool is coded by hand, shows the exact formula it uses, and gets fixed the moment something’s off. Need a calculator that isn’t here yet? Email me and it’s usually live within the hour, free.
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