The workbench

Small tools. Clear answers.

Start with a value, an equation or a set of standards. Every tool shows its working, and your measurements stay in your browser.

Move between absorbance and percentage transmittance. See what the numbers mean.

Find absorbance or concentration, with clear units and every step of the calculation.

Bring your standards. Fit a line, explore residuals and estimate unknown concentrations.

Move a slider. Watch light change. Get a feel for the Beer–Lambert relationship.