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Lab Calculators

Small, original planning calculators for common bench arithmetic. Everything runs in your browser: no account, no upload, and inputs stay on this device unless you copy them yourself. Always verify final conditions against your own SOP and equipment limits.

Dilution & copy number
Choose the factor yourself; get stock and diluent volumes. Ligation molar ratio
Insert amount from vector/insert length and molar ratio. qPCR efficiency
Efficiency from a standard-curve slope or two Ct points. RCF ↔ RPM
Convert centrifuge g-force and speed by rotor radius. Cell doubling time
Growth rate and doubling time from two cell counts. Copy number
DNA/RNA copies from mass, or required mass for a target copies/µL.

Planning aid only. These tools compute generic formulas and unit conversions. They are not paper-derived protocols and do not replace validated recipes, instrument manuals, biosafety rules, or your lab's own acceptance criteria.

Want the calculation read back as steps later? Listen Step for Android runs your reviewed protocols hands-free.