What you provide
What you provide
- First-order rate constant expressed in 1/s, using the same scenario as the other inputs
- The stated equation, unit convention, and modelling assumption must fit your intended use
CHEMISTRY / KINETICS
First Order Half-Life Calculator
Calculate the constant half-life of a first-order process from its rate constant. Inspect the chemical relationship, substituted values, result, assumptions, and unit convention in one guided workspace.
- 01 Calculated in this tab
- 02 Values stay in this browser tab
- 03 Use boundary
Use boundary
Calculation path
Calculate the constant half-life of a first-order process from its rate constant. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.
Calculation path
t_1/2 = ln(2)/k
What you receive
What you receive
- First-order half-life in s from the stated equation
- A symbolic formula plus substituted working with your values
- Visible assumptions, field guidance, and an authoritative learning reference
Use boundary
Choose the maximum decimal places shown. This does not increase source accuracy.
The process follows one first-order rate law with a constant rate coefficient.
Use internally consistent units and retain extra precision when carrying the result into another calculation.
Reviewed reference factors