Estimate universe balance using flexible density inputs quickly. Review conversions, ratios, and scenario comparisons instantly. Generate clean tables, graphs, and exports for deeper analysis.
The graph shows how critical density changes with the Hubble value.
The critical density formula is:
ρc = 3H² / (8πG)
6.67430 × 10^-11 m³·kg^-1·s^-2When actual density is supplied, the calculator also evaluates:
Ω = ρ / ρc
If Ω is near 1, the universe is approximately flat. Values above 1 suggest a closed universe. Values below 1 suggest an open universe.
| Hubble Value (km/s/Mpc) | Critical Density (kg/m³) | Critical Density (g/cm³) | Critical Density (protons/m³) |
|---|---|---|---|
| 67.4 | 8.5329e-27 | 8.5329e-30 | 5.1015e+0 |
| 70 | 9.2039e-27 | 9.2039e-30 | 5.5027e+0 |
| 73 | 1.0010e-26 | 1.0010e-29 | 5.9844e+0 |
| 75 | 1.0566e-26 | 1.0566e-29 | 6.3168e+0 |
These rows are example values for quick reference.
Critical density is the cosmic density that separates open and closed expansion models. It depends on the Hubble parameter and helps describe overall universe geometry.
The Hubble value controls the expansion rate of the universe. Since critical density depends on the square of that rate, even moderate Hubble changes noticeably affect the result.
Ω is the density parameter. It compares actual density with critical density. Values near one suggest flat geometry, above one suggest closed geometry, and below one suggest open geometry.
Yes. The calculator accepts kg/m³, g/cm³, and protons per cubic meter. It converts the chosen unit internally before comparing it with critical density.
Cosmic average densities are extremely low compared with everyday materials. Scientific notation keeps these tiny values readable and avoids long strings of zeros.
The graph plots critical density against nearby Hubble values. It helps visualize how sensitive the density estimate is to expansion-rate changes around your selected input.
Hubble time is the inverse of the Hubble parameter. It gives a characteristic expansion timescale and is often used as a rough cosmological age estimate.
Yes. The CSV file is useful for spreadsheets and data logging. The PDF button creates a clean summary that can be shared, saved, or printed.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.