Redshift Calculator

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Calculates the shift in wavelength of light due to the Doppler effect or cosmological expansion.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Observed Wavelength (nm) and Rest Wavelength (nm) in the units shown.

Step 2

Read Redshift (z) and Recessional Velocity (km/s) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Observed Wavelength (nm): 656.3 nm; Rest Wavelength (nm): 656.3 nm

Redshift (z): 0; Recessional Velocity (km/s): 0 km/s

Observed Wavelength (nm): 656.95 nm; Rest Wavelength (nm): 656.3 nm

Redshift (z): 0.0009904007314; Recessional Velocity (km/s): 296.9146697 km/s

Observed Wavelength (nm): 662.86 nm; Rest Wavelength (nm): 656.3 nm

Redshift (z): 0.00999542892; Recessional Velocity (km/s): 2,996.554205 km/s

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