How does the Spectrophotometry Calculator work?

Input measured absorbance, path length, molar absorptivity Then: Calculate concentration Then: Generate calibration curve if multiple samples.

Can you give an example of how to use the Spectrophotometry Calculator?

Example: Input Absorbance 0.5, ε = 5000 M⁻¹cm⁻¹, b = 1 cm gives a result of c = A/(εb) = 0.5/5000 = 1×10⁻⁴ M.

Is the Spectrophotometry Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Spectrophotometry Calculator?

Our Spectrophotometry Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

What formulas does this Spectrophotometry Calculator use?

This calculator uses standard chemistry formulas as taught in A-Level, AP, and university courses. Results are rounded to appropriate significant figures.

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Spectrophotometry Calculator

Beer-Lambert Law Calculator

Absorbance (A)

Molar Absorptivity ε (L/(mol·cm))

Path Length b (cm)

Concentration (M)

Spectrophotometry measures light absorption: A = log(I₀/I) = εbc (Beer-Lambert law), used for quantitative analysis.

Difficulty:intermediate

References

›Spectrophotometry — Wikipedia

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Spectrophotometry Calculator

Beer-Lambert Law Calculator

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Beer-Lambert Law Calculator