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Both calculators run independently — change the inputs on either side to compare results.

Cosmological Redshift Calculator

Compute the cosmological redshift (z), recession velocity, or distance of a galaxy from its observed vs. rest wavelength. Essential for astronomers and physics students analyzing spectral data from distant objects.

Observed Wavelength (nm)

Rest Wavelength (nm)

Hubble Constant (km/s/Mpc)

Calculation Type

Fill in the required fields to see your result.

Relativity

Gravitational Redshift Calculator

Compute the observed frequency of light or electromagnetic radiation emitted near a massive object, accounting for gravitational redshift predicted by General Relativity. Essential for astrophysics, pulsar timing, and GPS system design.

Source Frequency (Hz)

Gravitational Potential Difference (m²/s²)

Speed of Light (m/s)

Gravitational Scenario

Fill in the required fields to see your result.

Key differences

	Cosmological Redshift Calculator	Gravitational Redshift Calculator
Category	Relativity	Relativity
Inputs required	4	4
Result	Result (varies)	Observed Frequency (Hz)
What it does	Compute the cosmological redshift (z), recession velocity, or distance of a galaxy from its observed vs. rest wavelength. Essential for astronomers and physics students analyzing spectral data from distant objects.	Compute the observed frequency of light or electromagnetic radiation emitted near a massive object, accounting for gravitational redshift predicted by General Relativity. Essential for astrophysics, pulsar timing, and GPS system design.