Redshift Calculator
Calculate cosmological redshift, recessional velocity, distance, and lookback time using Hubble's law.
Inputs
nm
nm
km/s
Results
Redshift (z)
0
Velocity from Redshift
0 km/s
Distance
142.86 Mpc
Lookback Time
0.14 billion years
Relativistic Redshift0.033932
Distance0.14 Gly
How to Use This Calculator
- Enter the Observed Wavelength (nm) of the spectral line measured in the spectrum of the galaxy or quasar.
- Enter the Rest Wavelength (nm) β the lab-frame wavelength of the same line; H-alpha is 656.3 nm.
- The Redshift (z) is computed automatically from (Ξ»_obs β Ξ»_rest) / Ξ»_rest.
- Alternatively, enter a Recessional Velocity (km/s) to compute the corresponding redshift from velocity.
- Read Distance (Mpc and Gly) and Lookback Time (billion years) to place the object in cosmic context.
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Formula
z = (Ξ»_obs - Ξ»_rest) / Ξ»_restRelated Calculators
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