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FREE RESEARCH CALCULATOR

PCR & qPCR Master Mix Calculator

Scale per-reaction PCR or qPCR component volumes across reactions with configurable excess volume.

Calculate now ↓
CORE EQUATIONper-reaction volume × reactions × excess
Unit-awarePractical checksLocal processingHow results are handled →
READY TO CALCULATEExample values are included so you can test the workflow immediately.
MOLECULAR

PCR / qPCR master mix

Scale reaction components with overage and keep per-reaction volumes visible for a final sanity check.

component × reactions × excess
BENCH RECIPE✓ READY
COMPONENTPER RXNSCALED TOTAL
Master mix10 µL264 µL
Forward primer0.8 µL21.12 µL
Reverse primer0.8 µL21.12 µL
Nuclease-free water6.4 µL169 µL
Template2 µL52.8 µL

Volumes below are scaled totals including the selected excess. Add template separately if your workflow requires sample-specific dispensing.

26.4 reaction-equivalents
WHAT IT DOES

From formula to a bench-ready decision.

Convert a per-reaction recipe into a master mix sized for the entire run.

Tossora Lab keeps units, intermediate values, and practical preparation checks visible so a mathematically correct answer is easier to translate into an experimental workflow.

BUILT-IN CHECKS

What Tossora Lab checks.

  • Scales every component consistently.
  • Adds configurable overage for pipetting loss.
  • Separates component totals from per-reaction values.
BENCH NOTES

Before you use the result.

  • Follow the polymerase or master-mix manufacturer’s recommended component limits.
  • Prepare master mix for shared components to reduce well-to-well variability.

Research use only. Verify critical calculations, reagent specifications, route or instrument limits, and procedures against your approved protocol and institutional requirements.

COMMON USES

When this calculator is useful.

  • Scaling a PCR or qPCR recipe across many reactions.
  • Adding controlled overage for pipetting loss.
  • Reviewing per-reaction and total component volumes side by side.
WORKED CONTEXT

Example: scaling a qPCR master mix

Enter the final reaction volume, number of reactions, excess percentage and each per-reaction component. The calculator multiplies shared components by the same scale factor so the total mix remains proportional.

Try it with your values ↑
FAQ

Questions researchers often ask.

Why add extra master mix?

A modest protocol-defined overage can compensate for liquid retained in tubes and tips so the last reaction is not short of mix.

Should template be included in the shared master mix?

That depends on the assay design. Sample-specific template is commonly dispensed separately; follow the validated assay procedure for your run.

EVIDENCE & REVIEW

A result you can audit.

Reviewed 12 August 2026Reaction-scaling and overage review complete
01

Implementation check

Each per-reaction component is scaled by the reaction count and user-defined overage, while component totals and final prepared volume remain visible for review.

02

Interpretation boundary

The calculator scales an entered assay recipe; it does not validate primer concentration, chemistry, cycling conditions, inhibition, efficiency or reference-gene suitability.

qPCR & cell quantification workflow →Calculation methodology →Report a problem →
REFERENCE VALIDATION CASE

Reaction scaling with overage

Per-reaction component volumes multiplied by reactions × 1.10.

Inputs
  • 20 µL per reaction
  • 10 reactions
  • 10% overage
Expected result
  • 11 reaction-equivalents
  • 220 µL prepared total
  • Every component scaled by 11
CHECK IDLAB-VAL-004TOLERANCEAbsolute error ≤ 0.001 µLLAST RUN13 August 2026AUTOMATED CHECKReaction-equivalent multiplier and prepared total

Scope: Checks scaling, not assay chemistry or cycling conditions.

Review and correction history

12 August 2026 · Internal implementation review

Reaction-scaling and overage review complete. Formula behavior, unit handling, limitations and linked references were checked internally.

Independent reviewer: Not yet published. A name, relevant qualification, date and exact scope will appear here only after a real review is completed.

Source-informed and internally checked; independent scientific or regulatory validation is not claimed. Research use only.

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