AquaVerify

Recovery, bias and RPD calculator

Calculate spike recovery, bias and relative percent difference without default acceptance criteria.

Recovery, bias and RPD calculator

Formula

RPD% = |A - B| / ((A + B) / 2) x 100

Variables and units

  • same concentration units for paired values
  • % recovery
  • % bias
  • % RPD

Worked example

Example: 2.0, 6.8 and 5.0 gives 96% recovery.

Recovery is 96%; bias is -4%.

How to read the result

Enter method-specific criteria only when your SOP defines them.

Validation rules

Inputs must be finite, compatible and within calculation limits. Denominators cannot be zero.

Warnings

This calculator is an educational and workflow aid. It does not replace a validated method, SOP, accreditation decision or regulatory interpretation.

Private by design

Inputs and results stay in your browser. AquaTools Free does not send calculation values to AquaVerify servers.

Sources

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AquaVerify Cloud

Move from a one-off calculation to controlled sample, method and report workflows in AquaVerify Cloud.

FAQ

Are my inputs stored?

Inputs and results stay in your browser. AquaTools Free does not send calculation values to AquaVerify servers.

Can I use this as an official method record?

This calculator is an educational and workflow aid. It does not replace a validated method, SOP, accreditation decision or regulatory interpretation.

Where do saved calculations live?

AquaVerify Cloud keeps the governed workflows: saved calculations, history, traceability, ELN, LIMS review, reports and collaboration.