Hemocytometer Cell Count Calculator

A hemocytometer is a counting chamber used in labs to manually count cells under a microscope — the Hemocytometer Cell Count Calculator converts your raw counts into usable cell concentrations and viability data. Enter your viable (unstained) cell count, dead (stained) cell count, number of large squares counted, dilution factor, and hemocytometer factor to get your viable cell concentration, total cell concentration, and cell viability %. Optionally enter the total volume of original suspension to also calculate total viable cells and total cells in suspension.

cells

Total number of bright, unstained cells counted across all selected large squares

cells

Total number of blue-stained cells counted across all selected large squares

How many large (1mm x 1mm) squares were counted

Factor by which suspension was diluted before counting (e.g., 2 for 1:1 dilution with Trypan Blue)

cells/mL per cell/square

Factor to convert average cells/square to cells/mL (default 10,000 for standard hemocytometer)

mL

Optional: Enter the total volume to calculate total cell numbers

Results

Viable Cell Concentration

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Total Cell Concentration

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Cell Viability

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Total Viable Cells

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Total Cells in Suspension

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Frequently Asked Questions

What is a hemocytometer and how does it work?

A hemocytometer is a specialized microscope slide with a precise grid pattern used to count cells in suspension. It consists of large and small squares with known volumes, allowing accurate calculation of cell concentration.

What is the standard dilution factor for Trypan Blue staining?

The standard dilution factor is 2, achieved by mixing equal volumes of cell suspension and 0.4% Trypan Blue solution (1:1 ratio). This allows viable cells to remain unstained while dead cells appear blue.

How many squares should I count for accurate results?

Count at least 4 large squares (1mm x 1mm each) for statistical accuracy. If cell density is very low, count 5 squares. For very high density, you may need to dilute further and count fewer squares.

What is considered good cell viability?

Cell viability above 95% is considered excellent, 90-95% is good, 80-90% is fair, and below 80% is poor. Low viability may indicate cell stress, contamination, or improper handling.

Why use a hemocytometer factor of 10,000?

The factor 10,000 converts cells per large square to cells per mL. It accounts for the volume of one large square (0.1 μL) and converts to mL: 1/(0.1 × 10⁻³) = 10,000.

How do I distinguish between viable and dead cells?

Viable cells have intact membranes and exclude Trypan Blue, appearing bright and refractile. Dead cells have compromised membranes, take up the dye, and appear blue under the microscope.

What should I do if my cell count is too high or too low?

If counts are too high (>30 cells per square), dilute further. If too low (<10 cells per square), use a higher concentration or count more squares for better statistical accuracy.

Can I use this calculator for different cell types?

Yes, this calculator works for any cell type counted with a standard hemocytometer. Adjust the dilution factor based on your specific staining protocol and cell concentration needs.