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Half-Life of a Zero-Order Reaction Calculator

t½ = [A]₀ / (2 · k) — proportional to initial concentration.

Compute the half-life of a zero-order reaction A → products from the rate constant k (M·s⁻¹) and initial concentration [A]₀: t½ = [A]₀ / (2 k). Zero-order kinetics is rare for whole reactions but common for enzyme-catalysed reactions saturated with substrate, or photochemical reactions limited by light intensity.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

M/s
M

Results

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

t½ = [A]₀ / (2 · k).

In depth

Compute the half-life of a zero-order reaction A → products from the rate constant k (M·s⁻¹) and initial concentration [A]₀: t½ = [A]₀ / (2 k). Zero-order kinetics is rare for whole reactions but common for enzyme-catalysed reactions saturated with substrate, or photochemical reactions limited by light intensity.