Mean lifetime in years to years
Type a value in τ (years) to get it in yr instantly.
3,971.733yr
That's 132× as long-lived as cesium-137, while carbon-14 is 1.44× longer. Only one percent would be left after about 26,390 years.
Convert the other way: yr to τ (years)
What it means
How long does it last?
Half-life is a property of the nucleus alone. Heat, pressure and chemistry do not change it, which is what makes radiometric dating work.
The math
How to convert τ (years) to yr
To convert mean lifetime in years to years, multiply by 0.693147.
Example: 5,730 τ (years) × 0.693147 = 3,971.73 yr.
In the other direction, 1 yr = 1.4427 τ (years).
Every unit
Your half-life in every unit
Tables
τ (years) to yr conversion table
| τ (years) | yr |
|---|---|
| 1 τ (years) | 0.693147 yr |
| 60 τ (years) | 41.5888 yr |
| 3,600 τ (years) | 2,495.33 yr |
| 86,400 τ (years) | 59,887.9 yr |
| 1,000,000 τ (years) | 693,147 yr |
| 100,000,000 τ (years) | 69,314,700 yr |
| 1×10¹⁰ τ (years) | 6.931×10⁹ yr |
| 1.8×10¹¹ τ (years) | 1.248×10¹¹ yr |
| 1.4×10¹⁷ τ (years) | 9.704×10¹⁶ yr |
yr to τ (years) conversion table
| yr | τ (years) |
|---|---|
| 1 yr | 1.4427 τ (years) |
| 60 yr | 86.5617 τ (years) |
| 3,600 yr | 5,193.7 τ (years) |
| 86,400 yr | 124,649 τ (years) |
| 1,000,000 yr | 1,442,700 τ (years) |
| 100,000,000 yr | 144,270,000 τ (years) |
| 1×10¹⁰ yr | 1.443×10¹⁰ τ (years) |
| 1.8×10¹¹ yr | 2.597×10¹¹ τ (years) |
| 1.4×10¹⁷ yr | 2.02×10¹⁷ τ (years) |
Quick answers
Quick answers
- How many yr is 1 τ (years)?
- 1 τ (years) is 0.693147 yr.
- How many yr is 10 τ (years)?
- 10 τ (years) is 6.93147 yr.
- How many yr is 5,730 τ (years)?
- 5,730 τ (years) is 3,971.73 yr.
The units
About these units
Mean lifetime in years (τ (years))
How long an average atom survives, in years: the half-life divided by 0.693.
Years (yr)
From caesium-137 at 30 years to uranium at billions.
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