Chemistry
Reagent Master Mix Calculator
Calculate the complete reaction count, prepared mix volume, stock and diluent requirements, per-component totals, and unused container capacity.
Sample reactions-
Total reactions including controls-
Common mix per reaction-
Base common master-mix volume-
Additional overage volume-
Prepared master-mix volume-
Whole reservoirs required-
Unused reservoir capacity-
Equivalent extra reaction aliquots-
Decision view
Master-mix reservoir and reaction distribution
Master-mix reservoir and reaction distributionSample, replicate, and control reactions feed the common-mix calculation before overage is held in reserve and aliquots are distributed.
Exact scenario comparisonSamples changes while all other entered assumptions remain constant.
| Samples | Sample reactions | Total reactions including controls | Common mix per reaction | Base common master-mix volume | Additional overage volume | Prepared master-mix volume | Whole reservoirs required | Unused reservoir capacity | Equivalent extra reaction aliquots |
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Period-by-period detail
Master-mix preparation reconciliation
How to use Reagent Master Mix Calculator
- Count positive, negative, and no-template controls.
- Confirm which components belong in the common mix.
- Select overage based on reaction count and dispensing method.
Calculator guide
Understanding Reagent Master Mix Calculator
A master mix should scale per-reaction components across samples, replicates, controls, and pipetting overage without changing component ratios.
Calculation method
How the calculation works
Scale a common reagent mix across samples, replicates and controls while excluding separately added sample or template and preserving a clear overage allowance. Samples times replicates plus controls determine reactions; per-reaction volume is multiplied by reactions and an explicit overage factor.
Mix distribution
Scale one recipe into every reaction well
A preparation reservoir feeds sample, replicate, and control wells while overage and dead volume remain visible.
Worked situations
Practical examples
- Forty-eight samples in duplicate plus four controls require 100 reactions before overage.
- A 10% overage protects against dead volume.
- Template added separately should not be included in shared mix volume.
Better inputs
Useful tips
- Round only final preparation volumes.
- Use a container with enough mixing headspace.
- Record lot numbers and actual prepared volume.
Before relying on the result
Limitations and common mistakes
- This is a volume calculator, not a chemistry protocol.
- Component compatibility, freeze-thaw history, mixing order, reaction kinetics, contamination control, and instrument requirements are outside the model.
- Follow the validated assay procedure.
Reference
Key terms
- Master mix
- Shared reagent mixture dispensed across multiple reactions.
- Control reaction
- Reaction included to verify assay performance or contamination.
- Dead volume
- Liquid that cannot be reliably recovered from a vessel or dispensing system.
Important note
Calculated from the entered values using the displayed chemical relationship. Confirm identity, units, purity, conditions, and laboratory safety requirements.
Frequently asked questions
Should template volume be included?
Only if it is genuinely common to every reaction.
Is more overage always safer?
It increases cost and waste; use a justified handling allowance.
When should values be rounded?
After calculating component totals and considering instrument resolution.