Cell Dilution Calculator - Laboratory Cell Culture Dilution
Calculate cell dilution volumes for desired concentrations using the dilution equation C₁ × V₁ = C₂ × V₂. Supports standard and serial dilutions with unit conversions.
Cell Dilution Calculator — C₁V₁ = C₂V₂
Calculate stock and diluent volumes for cell culture, hemocytometer, flow cytometry, and colony counting.
Sample Scenarios — Click to Load
Inputs
Dilution Parameters
Concentration Comparison
Volume Distribution
For educational use only. Always confirm dosages and care with a licensed veterinarian.
📋 Key Takeaways
- • C₁ × V₁ = C₂ × V₂ — conservation of mass. Cells (or solute) constant before and after dilution.
- • V₁ = (C₂ × V₂) / C₁ — stock volume needed. Diluent = V₂ − V₁.
- • Use serial dilutions for large factors (1000×+). Standard dilution for moderate factors.
- • Always mix thoroughly, use calibrated pipettes, and verify concentrations when possible.
💡 Did You Know?
📖 How Cell Dilution Works
Cells (or solute) are conserved: C₁V₁ = C₂V₂. Solve for V₁ = (C₂ × V₂) / C₁. Add diluent = V₂ − V₁.
Core Formula
V₁ = (C₂ × V₂) / C₁ | Diluent = V₂ − V₁
🎯 Expert Tips
Calibrated Pipettes
Use calibrated pipettes. Avoid very small volumes (<1 µL) to minimize error.
Mix Thoroughly
Mix after each dilution. Incomplete mixing skews concentration and downstream results.
Correct Diluent
Use culture medium or buffer for live cells. Water causes osmotic shock.
Verify When Possible
Hemocytometer or automated counter to confirm final concentration.
⚖️ Application vs Concentration
| Application | Typical Concentration | Dilution Factor |
|---|---|---|
| Cell Culture Passage | 50k–100k cells/mL | 1:5 to 1:10 |
| Hemocytometer | 200k–500k cells/mL | 1:4 to 1:10 |
| Flow Cytometry | 500k–1M cells/mL | 1:5 to 1:10 |
| Colony Counting | 100–1k cells/mL | 1:100 to 1:10k |
| Drug Screening | 10k–100k cells/mL | 1:10 to 1:100 |
❓ Frequently Asked Questions
What is the dilution equation?
C₁V₁ = C₂V₂. Mass (cells or solute) is conserved. Solve for any variable given the other three.
When to use serial vs standard dilution?
Standard for moderate factors (e.g., 1:10). Serial for large factors (1000×+) or multiple concentration points.
What diluent for cell culture?
Culture medium or PBS. Never water—causes osmotic shock and cell death.
How to avoid pipetting errors?
Use calibrated pipettes, correct pipette size for volume, mix thoroughly, avoid very small volumes.
What if C₂ > C₁?
Invalid for dilution. You cannot dilute to a higher concentration. Check inputs.
Units: cells/mL vs cells/µL?
Convert consistently. 1 cells/µL = 1000 cells/mL. Calculator handles both.
📊 Dilution by the Numbers
📚 Sources
⚠️ Disclaimer: For educational and planning purposes. Verify concentrations with hemocytometer or automated counter. Use sterile technique and appropriate diluents. Not a substitute for lab SOPs.
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