Redshift Calculator

Calculate cosmological redshift, velocities, and distances using official astronomical formulas

Observed Wavelength (nm)(spectral line)

Rest Wavelength (nm)(laboratory value)

Hubble Constant (km/s/Mpc)(H₀)

Calculation Type

Common spectral lines:

Hydrogen Hα: 656.28 nm

Hydrogen Hβ: 486.13 nm

Hydrogen Hγ: 434.05 nm

Sodium D: 589.29 nm

Calcium K: 393.37 nm

Oxygen [OIII]: 500.7 nm

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Quick Tips

1Use consistent units throughout calculations
2Consider significant figures in results
3Document experimental conditions
4Verify results with control calculations