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Science Calculators

Physics, chemistry, conversions, and more. 5 free calculators — no sign-up required.

Wavelength Frequency Calculator

Convert between wavelength, frequency, and wave speed for any type of wave using the wave equation v = fλ.

Refractive Index Calculator

Calculate the refractive index of a material from the speed of light, or use Snell's law to find the angle of refraction between two media.

Beer-Lambert Law Calculator

Calculate absorbance, transmittance, molar absorptivity, concentration, or path length using the Beer-Lambert law A = εcl.

Bragg Diffraction Calculator

Calculate interplanar spacing, diffraction angle, or X-ray wavelength using Bragg's law nλ = 2d sinθ, with full step-by-step working.

Planck Blackbody Calculator

Calculate blackbody radiation spectral radiance, peak wavelength (Wien's law), and total power (Stefan-Boltzmann law) for any temperature.