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CHEMISTRY / KINETICS

First Order Concentration Calculator

Calculate concentration remaining under one first-order integrated rate law. Inspect the chemical equation, substituted inputs, unit basis, assumptions, and result in one guided workspace.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Preparing the calculator...

Use boundary

Calculation path

Calculate concentration remaining under one first-order integrated rate law. 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

[A]_t=[A]_0e^(-kt)

What you provide

What you provide

  • Initial concentration expressed in mol/L, using the same scenario as the other inputs
  • First-order rate constant expressed in 1/s, using the same scenario as the other inputs
  • Elapsed time expressed in s, using the same scenario as the other inputs

What you receive

What you receive

  • Remaining concentration in mol/L 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.

One first-order process with constant temperature and rate coefficient governs the species.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors