Free Biotechnology & Molecular Biology Calculators
Fast, free scientific calculators for molecular biology, biotechnology, biochemistry, cell culture and laboratory research. Every tool shows its formula, works through real numbers and cites its sources — and every calculation runs locally in your browser.
- No login
- No data collected
- Formulas & sources shown
- Mobile-ready
Popular calculators
Start with the molarity calculator, the most-used concentration tool at the bench, or browse the full laboratory calculator collection.
- Molarity CalculatorSolve molarity, mass, volume or moles.
- Dilution CalculatorC1V1 = C2V2 stock dilutions.
- DNA Molecular Weight CalculatorMW from length or sequence.Coming soon
- Primer Tm CalculatorMelting temperature estimates.Coming soon
- PCR Master Mix CalculatorPer-reaction and total volumes.Coming soon
- DNA Concentration CalculatorFrom A260 absorbance.Coming soon
Browse by workflow
Calculators are grouped by the task you are doing, not the alphabet. Each workflow chains the tools you reach for in sequence — concentration first, then dilution, then reaction setup.
Prepare a Solution
Prepare DNA / RNA
- DNA MW
- DNA Concentration
- DNA Molarity
Set Up PCR
- Primer Tm
- PCR Master Mix
- qPCR Efficiency
Culture Cells
- Cell Counting
- Cell Seeding
- Cell Viability
Analyze Results
- ΔΔCt
- Beer-Lambert
- Enzyme Kinetics
Learn the method
Every calculator is paired with a guide that explains the why behind the numbers. Begin withwhat is molarity or the step-by-stephow to calculate molarity.