Free AI-Assisted

PCR Master Mix Calculator

Plan PCR master mixes for multiple assays—pipette volumes, overage, printable bench sheet. Built-in AI agent assistant support.

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Key facts

Key facts about PCR Master Mix Calculator
FactValue
InputsReaction vol (µL), template vol/rxn (µL), no. reactions, overage (×); reagent name, stock conc., final conc. per row
Concentration unitsM, mM, µM, nM, fold (×) — auto-converted within unit class
OutputsSingle Tube Reaction; Master Mix Preparation with per-reaction and total µL; consolidated reagents across assays
Built-in templates4 presets (Standard 2×, SYBR component-wise, 2× SYBR kit, GoTaq genotyping)
Pipette warningFlags volumes below 0.5 µL with suggested stock dilution
Volume precisionAll displayed and exported volumes rounded to 2 decimal places
Protocol libraryBrowser-local save, load, rename, duplicate, delete; 2 example protocols on first visit
ExportCopy results, Export CSV, Print bench sheet, Copy share link
Runs in browserYes — no install
Account requiredNo
Data uploadNone — calculations and protocols stay in your browser

What it does

Retyping the same qPCR recipe each week and hand-adding reagent totals across primer pairs invites transcription errors—and most free calculators handle only one assay with no bench record. The PCR Master Mix Calculator turns stock concentration, final concentration, reaction volume, reaction count, and overage into pipette-ready microliters for every master-mix component, updated live as you edit.

Set Assay name, Reaction vol (µL), Template vol / rxn (µL), No. reactions, and Overage (×) (default 1.1×). List reagents with Name, Stock conc., and Final conc. in M, mM, µM, nM, or fold; use Load template or + Add reagent for kit mixes, DMSO, or probes. Template DNA stays out of the bulk mix; water fills the base mix automatically.

Results show Single Tube Reaction and Master Mix Preparation with overage totals. + Add assay builds multi-primer plates; Consolidated reagents (all assays) sums shared stocks. Warnings flag impossible dilutions, sub-0.5 µL transfers with dilution hints, and duplicate names. Export via Copy results, Export CSV, Print bench sheet, Save protocol, or Copy share link.

Why researchers use it

  • Skip retyping the same weekly qPCR recipe
  • Total reagents across multiple assays on one plate
  • Catch final concentration above stock before pipetting
  • Flag sub-0.5 µL volumes with dilution hints
  • Keep template DNA separate from bulk master mix
  • Document mixes with printout or ELN paste

Best for

  • Routine SYBR or TaqMan qPCR panels
  • Genotyping with several primer pairs per plate
  • Custom mixes with DMSO, BSA, or probes
  • Core facility prep for 96-well plates
  • SOPs and ELN records for reproducible PCR setup
  • Multiplex runs needing consolidated reagent totals

When to use this vs alternatives

Choose this tool when custom reagent lists, multi-assay consolidated totals, saved protocols, and a printable bench sheet must live in one browser session. Use the Primer Tm Calculator first when you need melting temperature (Tm), suggested annealing temperature (Ta), or primer QC before setting reaction volumes. Sigma and Qiagen vendor calculators still fit a quick sanity check on their kit components only. CalcBE suits custom single-assay math with shareable URLs when you do not need named protocol storage or multi-assay batch totals.

What makes it different

Most alternatives solve one piece—kit-specific math, custom components, or shareable links—but not persistent recipes, multi-assay consolidation, and bench-ready export together. Sigma and Qiagen vendor calculators lock you to kit components with no save, export, or multi-assay mode. CalcBE handles custom components and shareable URLs but does not save named protocols, combine several assays, or warn about sub-0.5 µL transfers.

This browser tool accepts any reagent you define, keeps named recipes locally, runs multiple assay tabs with consolidated totals, warns when a transfer is below 0.5 µL, and outputs a printable bench sheet or CSV—without an account. Researchers switch when they retype weekly recipes, manually sum reagents across primer pairs, or screenshot volumes because no tool produces a bench-ready record.

How to get started

  1. Open the workspace and stay on the Calculator tab.
  2. Set Assay name, Reaction vol (µL), Template vol / rxn (µL), No. reactions, and Overage (×)—or choose Load template.
  3. Edit Name, Stock conc., and Final conc. for each reagent; click + Add reagent for extras like DMSO or probe.
  4. Click + Add assay if the plate needs additional primer pairs; review Single Tube Reaction, Master Mix Preparation, and Consolidated reagents (all assays).
  5. Click Copy results, Export CSV, Print bench sheet, Save protocol, or Copy share link.
  6. Open the Protocol Library tab to load, rename, duplicate, or delete saved recipes.

Frequently asked questions

How do I calculate PCR master mix volumes?
Enter reaction and template volumes; base mix = reaction − template. Per reagent, µL = (final ÷ stock) × base mix, with molar or fold units auto-converted. Water fills the remainder. Bulk totals = per-reaction volumes × reaction count × overage. Values update live and round to two decimal places.
Should template DNA be included in the master mix?
No—template is added per tube, not in bulk. Use Template vol / rxn (µL) separately. Single Tube Reaction shows template, master mix added, and total; Master Mix Preparation lists bulk components with overage only.
What is overage and why use 1.1×?
Overage multiplies bulk master mix totals for pipetting loss. Default Overage (×) is 1.1 (10% extra). Per-reaction display uses your entered count; bulk totals include overage. Values above 50× trigger a soft warning.
How do I handle reagent volumes below 0.5 µL?
The tool flags sub-0.5 µL transfers and suggests a stock dilution (e.g. 2-fold or 4-fold) so the transfer reaches ≥0.5 µL. Update Stock conc. after preparing diluted stock. U/µL enzyme activity is not supported—use fold or molar units.
Can I plan multiple primer pairs on one plate?
Yes. Click + Add assay per primer pair. Consolidated reagents (all assays) totals shared stocks across tabs; each assay keeps its own Master Mix Preparation breakdown.
How do vendor PCR calculators differ from custom recipes?
Sigma and Qiagen tools lock to kit components—no DMSO, probe, or custom additives—and lack protocol save, multi-assay totals, or bench sheets. This calculator accepts any reagents, saves recipes locally, consolidates multi-assay totals, and exports CSV or print-ready output.

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Last updated . Pepkio builds free lab calculators alongside bioinformatics CRO services.