Half-Life Calculator
Calculate radioactive decay using the half-life formula.
What to Calculate
Parameters
Starting quantity
Time for half to decay (e.g., 5730 years for C-14)
Time since initial measurement
Half-Life Formula
N = N₀ × (1/2)^(t/t½)
Variables:
- N = Remaining amount
- N₀ = Initial amount
- t = Time elapsed
- t½ = Half-life
Common Half-Lives:
- Carbon-14: 5,730 years
- Uranium-238: 4.5 billion years
- Radon-222: 3.8 days
Related Calculators
Half-Life Result
Remaining Amount29.8292
Percent Remaining29.8292%
Amount Decayed70.1708
Number of Half-Lives1.7452
Decay Constant (λ)0.0001
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