Free lab & biostatistics calculators
Seven tools that cover the calculations biotech teams repeat every week — bench chemistry through statistical planning. Everything runs in your browser. Nothing is stored.
Bench chemistry
The math you redo every time you make a buffer or a stock.
Molecular weight calculator
Molar mass and percent composition from any formula, including hydrates and nested groups.
Open toolMolarity calculator
Solve for mass, volume, or concentration — with automatic molecular weight lookup.
Open toolDilution calculator (C1V1)
Single dilutions plus a serial dilution planner that prints every transfer volume.
Open toolBiostatistics
Planning and analysis checks for clinical and preclinical work.
Clinical trial risk calculator
Score a Phase 1/2/3 design against industry phase-transition benchmarks and see the flaws driving failure risk.
Open toolSample size & power calculator
Sample size for proportions and means, two-group power, and margin of error.
Open toolConfidence interval calculator
Intervals for means and proportions, including the Wilson score interval.
Open toolP-value & t-test calculator
Welch and pooled two-sample t-tests, one-sample tests, and statistic-to-p conversion.
Open toolWhy we give these away
Quandra Sciences builds verifiable AI for regulated biotech work — statistical analysis plans, R and SAS code, and citation-checked answers with an audit trail. These calculators are the deterministic core of that system, published free so you can check our math before you trust anything larger.