Per second to km/s per megaparsec
Type a value in s⁻¹ to get it in km/s/Mpc instantly.
2.08×10²¹km/s/Mpc
That's 4,159,493,379,850,363,400× as fast as Hubble’s 1929 estimate — nothing on our list beats it. Its Hubble time is 4.701×10⁻¹⁹ billion years.
Convert the other way: km/s/Mpc to s⁻¹
What it means
How fast is that expansion?
The Hubble time 1/H₀ is close to, but not the same as, the age of the universe, which depends on how expansion changed over time (13.8 billion years).
The math
How to convert s⁻¹ to km/s/Mpc
To convert per second to km/s per megaparsec, multiply by 3.086×10¹⁹.
Example: 67.4 s⁻¹ × 3.086×10¹⁹ = 2.08×10²¹ km/s/Mpc.
In the other direction, 1 km/s/Mpc = 3.241×10⁻²⁰ s⁻¹.
Every unit
That expansion rate in every unit
Tables
s⁻¹ to km/s/Mpc conversion table
| s⁻¹ | km/s/Mpc |
|---|---|
| 50 s⁻¹ | 1.543×10²¹ km/s/Mpc |
| 55 s⁻¹ | 1.697×10²¹ km/s/Mpc |
| 60 s⁻¹ | 1.851×10²¹ km/s/Mpc |
| 65 s⁻¹ | 2.006×10²¹ km/s/Mpc |
| 67.4 s⁻¹ | 2.08×10²¹ km/s/Mpc |
| 69.8 s⁻¹ | 2.154×10²¹ km/s/Mpc |
| 70 s⁻¹ | 2.16×10²¹ km/s/Mpc |
| 73 s⁻¹ | 2.253×10²¹ km/s/Mpc |
| 75 s⁻¹ | 2.314×10²¹ km/s/Mpc |
| 80 s⁻¹ | 2.469×10²¹ km/s/Mpc |
| 100 s⁻¹ | 3.086×10²¹ km/s/Mpc |
km/s/Mpc to s⁻¹ conversion table
| km/s/Mpc | s⁻¹ |
|---|---|
| 50 km/s/Mpc | 1.62×10⁻¹⁸ s⁻¹ |
| 55 km/s/Mpc | 1.782×10⁻¹⁸ s⁻¹ |
| 60 km/s/Mpc | 1.944×10⁻¹⁸ s⁻¹ |
| 65 km/s/Mpc | 2.107×10⁻¹⁸ s⁻¹ |
| 67.4 km/s/Mpc | 2.184×10⁻¹⁸ s⁻¹ |
| 69.8 km/s/Mpc | 2.262×10⁻¹⁸ s⁻¹ |
| 70 km/s/Mpc | 2.269×10⁻¹⁸ s⁻¹ |
| 73 km/s/Mpc | 2.366×10⁻¹⁸ s⁻¹ |
| 75 km/s/Mpc | 2.431×10⁻¹⁸ s⁻¹ |
| 80 km/s/Mpc | 2.593×10⁻¹⁸ s⁻¹ |
| 100 km/s/Mpc | 3.241×10⁻¹⁸ s⁻¹ |
Quick answers
Quick answers
- How many km/s/Mpc is 1 s⁻¹?
- 1 s⁻¹ is 3.086×10¹⁹ km/s/Mpc.
- How many km/s/Mpc is 10 s⁻¹?
- 10 s⁻¹ is 3.086×10²⁰ km/s/Mpc.
- How many km/s/Mpc is 67.4 s⁻¹?
- 67.4 s⁻¹ is 2.08×10²¹ km/s/Mpc.
The units
About these units
Per second (s⁻¹)
H₀ in SI, as a rate.
Km/s per megaparsec (km/s/Mpc)
The standard unit of H₀.
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