Hubble Time

Order-of-magnitude Hubble time 1/H0 from H₀ in km/s/Mpc.

H₀ (km/s/Mpc)

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~Hubble time (Gyr)

14.51

1/H₀ (s)457,815,664,836,795,200

How to Use This Calculator

Enter the Hubble constant H0 (km/s/Mpc) -- current best estimate is ~67-73 km/s/Mpc.
Review the Hubble time in billions of years (Gyr) and in seconds.
Note that Hubble time (1/H0) is an upper bound -- the actual universe age (~13.8 Gyr) is slightly less.
Explore how uncertainty in H0 (the Hubble tension) affects the estimated age of the universe.

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