Hubble's Law Distance Calculator
Hubble's law relates how fast a galaxy recedes to how far away it is, letting you turn a velocity or redshift into a distance.
km/s
km/s/Mpc
Estimated distance from Hubble’s law
- 1
Velocity from redshift: v = c × z
299,792.458 × 0,05 = 14 989,6 - 2
Distance d = v ÷ H₀
14 989,6 ÷ 70 = 214,14
Miten tämä laskin toimii?
Hubble's law says recessional velocity equals the Hubble constant times distance, so distance is velocity divided by H₀. Enter a galaxy's velocity (or redshift, converted with v = c·z) and H₀ to get its distance in megaparsecs and millions of light-years. Accurate for nearby, low-redshift galaxies.
Kaava
How this is calculated
Hubble's law states that the recessional velocity v of a distant galaxy is proportional to its distance d: v = H₀·d, where H₀ is the Hubble constant (default 70 km/s/Mpc). Rearranging gives the distance d = v / H₀, expressed in megaparsecs (Mpc).
You can supply the velocity directly in km/s, or leave it blank and enter the cosmological redshift z. For modest redshifts the velocity is approximated by v = c·z, where c = 299,792.458 km/s is the speed of light. The resulting distance is also converted to millions of light-years using 1 Mpc = 3.262 Mly.
This linear relation is an excellent approximation for relatively nearby galaxies (low redshift). At large z the simple v = c·z relation breaks down because of relativistic and cosmological effects, and the true distance depends on the full expansion history of the universe, so treat large-redshift results as rough estimates. A larger H₀ implies a faster-expanding, younger universe and therefore a smaller inferred distance for the same velocity.
Usein kysytyt kysymykset
Enter whichever you have. If the velocity field is filled it is used directly; otherwise the redshift z is converted via v = c·z. For low redshifts both give nearly identical distances.
A commonly cited value is about 70 km/s/Mpc, though measurements range from roughly 67 to 74 depending on method. Changing H₀ scales the distance inversely.
No. The v = c·z approximation and the linear Hubble law only hold at low redshift. For z greater than about 0.1, relativistic and cosmological corrections become important.
Tunnetaan myös nimellä
TG we-Calculate Editorial Team. (2026). Hubble's Law Distance Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/fi/calculator/hubble-law-distance-calculator
TG we-Calculate Editorial Team. "Hubble's Law Distance Calculator." TG we-Calculate. 2026. https://we-calculate.com/fi/calculator/hubble-law-distance-calculator.
TG we-Calculate Editorial Team, "Hubble's Law Distance Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/fi/calculator/hubble-law-distance-calculator
@misc{wecalculate_hubble_law_distance_calculator, title = {Hubble's Law Distance Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/fi/calculator/hubble-law-distance-calculator}}, year = {2026}, note = {TG we-Calculate} }
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