Advanced Option Dilution Calculator
Select what you want to solve. Enter all known values. Units can differ, but stock and target concentration units must belong to the same family.
Formula Used
The calculator uses the standard chemistry dilution equation:
C₁ × V₁ = C₂ × V₂
- C₁ is the stock concentration.
- V₁ is the stock aliquot volume.
- C₂ is the target concentration.
- V₂ is the final solution volume.
Diluent volume is calculated as V₂ - V₁.
Dilution factor is calculated as C₁ ÷ C₂ or V₂ ÷ V₁.
Planned batch volume includes replicates, overage, mixing loss, and dead volume.
How to Use This Calculator
- Select the value you want to calculate.
- Enter known stock concentration, target concentration, stock aliquot, or final volume.
- Choose units from the same concentration family.
- Add replicate count, overage, mixing loss, and dead volume if needed.
- Press the calculate button.
- Review the result, chart, preparation totals, and warnings.
- Download the CSV or PDF report for lab records.
Example Data Table
| Stock concentration | Target concentration | Final volume | Stock aliquot | Diluent | Dilution factor |
|---|---|---|---|---|---|
| 100 mM | 10 mM | 50 mL | 5 mL | 45 mL | 10 fold |
| 1 M | 50 mM | 100 mL | 5 mL | 95 mL | 20 fold |
| 500 mg/L | 25 mg/L | 200 mL | 10 mL | 190 mL | 20 fold |
Option Dilution Planning Guide
Why dilution planning matters
Accurate dilution planning protects every chemistry result. A small volume error can shift concentration. That shift can change color, rate, yield, or instrument response. This calculator turns the dilution equation into a practical lab plan. It helps you solve for stock volume, final volume, stock strength, or target strength.
How the calculator supports lab work
The form accepts common molar, mass, and percentage units. It also handles microliter, milliliter, and liter volumes. You can add replicate count, overage, mixing loss, and dead volume. These options make the plan closer to real bench work. The result shows the missing value first. It also shows stock transfer, diluent volume, dilution factor, stock percentage, and serial step guidance.
Good practice for reliable dilution
Always confirm that stock and target units belong to the same family. Do not mix molarity with mass concentration unless a molecular weight conversion has already been made. Choose pipettes that place the transfer volume in their accurate working range. Rinse tips when handling viscous solutions. Mix each dilution thoroughly before taking an aliquot for another step.
Using serial dilution wisely
Large dilution factors are often easier as serial dilutions. A 10,000 fold dilution may be more reliable as four ten fold steps. Each step uses a larger transfer volume and reduces pipetting stress. The calculator estimates the equal fold factor for your selected step count. You can then build a table for each stage.
Documentation and exports
Record the sample name, diluent, units, and assumptions. Use the CSV export for worksheets. Use the PDF export for lab notes, quality records, or batch sheets. Keep the example table nearby when training new users. Recheck critical work with a second person. The equation is simple, but preparation details matter.
Before preparing any batch, inspect glassware for residue. Use fresh diluent when contamination can affect readings. Label tubes before pipetting. Work from the lowest concentration to the highest when possible. Store prepared solutions under suitable temperature and light conditions. Discard expired stocks. Review safety data sheets for hazardous solvents, acids, bases, or reactive salts before handling. Document every change immediately after preparation carefully.
FAQs
What does this dilution calculator solve?
It solves stock aliquot volume, final volume, stock concentration, or target concentration using the dilution equation. It also estimates diluent volume, dilution factor, batch totals, and serial dilution steps.
Can I mix molar and mass concentration units?
No. Molar units and mass units need molecular weight conversion before they can be compared. Use one concentration family inside the calculator for accurate dilution results.
What is stock aliquot volume?
Stock aliquot volume is the amount of concentrated stock solution transferred into the final container. Diluent is then added until the desired final volume is reached.
Why is my diluent volume negative?
A negative diluent volume means the stock transfer is larger than the final volume. Check units, target concentration, stock strength, and calculation mode before preparing the solution.
What is overage percentage?
Overage adds extra prepared volume to cover pipetting loss, tube residue, or repeated handling. Many labs use small overage values for practical preparation safety.
What does mixing loss mean?
Mixing loss estimates volume lost during transfer, wetting, vortexing, or container handling. The calculator increases planned preparation volume to compensate for this loss.
When should I use serial dilution?
Use serial dilution when the dilution factor is very large. Smaller repeated steps often improve pipetting accuracy and reduce extreme small-volume transfers.
Can I export the result?
Yes. Use the CSV button for spreadsheet records. Use the PDF button for printable lab notes, batch sheets, or quality documentation.