LabCalc

Spike Recovery Calculator

Recovery % = (spiked − unspiked) / added × 100

Spike recovery percentage from the unspiked result, the spiked result and the amount added.

Inputs

mg/L
mg/L
mg/L

Result

97 %

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Calculation

  1. Definition

    Recovery % = (spiked − unspiked) / added × 100

  2. Measured increase

    6.05 mg/L − 1.2 mg/L

    4.85 mg/L

  3. Substitution

    4.85 / 5 × 100

    97 %

Inputs

Unspiked
1.2 mg/L
Spiked
6.05 mg/L
Added
5 mg/L

All three values must be expressed in the same unit and on the same basis (all concentrations, or all amounts).

LabCalc does not state or imply any acceptable recovery range — acceptance criteria belong to your method.

About this calculator

Spike recovery compares the increase actually measured after spiking a sample with the amount that was added. It is a simple accuracy check for a method in a given matrix.

All three values must be in the same unit and on the same basis — all concentrations or all amounts. LabCalc states no acceptable recovery range: acceptance criteria come from your method, not from a calculator.

LabCalc is provided as a calculation aid. Users remain responsible for verifying calculations, units, chemical compatibility, experimental procedures and applicable safety requirements before laboratory use.

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