How does the Redshift Calculator work?

Input observed and rest wavelengths Then: Calculate z = (λ_obs - λ_rest) / λ_rest Then: Estimate distance using Hubble constant.

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

Example: Input z = 0.1 gives a result of Recession velocity ~10,000 km/s, distance ~400 Mpc (Using H₀ = 70 km/s/Mpc).

Is the Redshift 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 Redshift Calculator?

Our Redshift 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.

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Redshift Calculator

Observed Wavelength (nm)

Emitted Wavelength (nm)

Redshift (z) measures wavelength increase due to cosmic expansion or relative motion. Higher z indicates greater distance or recession speed.

Symbol	Name	Unit	Description
z	(λ_obs - λ_rest) / λ_rest	—	(λ_obs - λ_rest) / λ_rest

Difficulty:advanced

References

›Redshift — Wikipedia

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Redshift Calculator