What formula does the calculator use?

Cell concentration = (total cells counted ÷ squares counted) × dilution factor × 10⁴ cells/mL.

What dilution factor should I use for a 1:1 trypan blue mixture?

Use a dilution factor of 2 because the loading mixture contains equal volumes of sample and trypan blue.

How many squares should I count?

Common choices are 4 corner squares or 5 large squares including the center.

What does the count-quality advice mean?

The tool compares the average count with the suggested range of 20–100 cells per square. Counts below that range may benefit from counting more squares.

How do I calculate total cells in the sample?

Enter the original sample volume in mL. The calculator multiplies the calculated cells/mL by that volume.

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Hemocytometer Cell Counter (cells/mL)

Turns Neubauer grid counts into cells/mL with dilution factor, total-count option, and 20–100 cells/square density advice. Educational use only.

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2 examples

248 cells in 4 corner squares, 1:1 trypan blue → 1.24×10⁶ cells/mL

You count 248 cells across the 4 corner large squares (average 62 per square — inside the ideal 20–100 band) of a sample loaded 1:1 with trypan blue (dilution factor 2). The concentration is 62 × 2 × 10⁴ = 1,240,000 cells/mL, ready for seeding math.

{"result":"Cell concentration ≈ 1,240,000 cells/mL (62 cells/square average, dilution ×2).","metadata":{"result":{"cellsPerMl":1240000,"avgPerSquare":62,"countQuality":"good"}}}

95 cells in 5 squares, 10 mL stock → 1.9×10⁶ total cells

A neat sample (no dye, dilution factor 1) yields 95 cells across 5 large squares — only 19 per square, below the ideal band, so the tool suggests counting more squares. The concentration is 1.9×10⁵ cells/mL, and in the full 10 mL stock that is 1,900,000 total cells.

{"result":"Cell concentration ≈ 190,000 cells/mL; ≈ 1,900,000 total cells in 10 mL (19 cells/square average).","metadata":{"result":{"cellsPerMl":190000,"totalCellsInSample":1900000,"countQuality":"low"}}}

Inputs

Set the required fields, then run the tool.

5 options

SettingsAdjust formats, ranges, numbers, and modes.5

Total Cells CountednumberRequiredSum of the cells counted across all counted large squares.Squares CountednumberRequiredNumber of 1 mm² large squares the total covers (4 corners, or 5 including center).Dilution FactornumberRequiredTotal-to-sample volume ratio of the loading mix (1:1 with trypan blue ⇒ 2).Sample Volume (mL)numberOptionalOptional original suspension volume, for the total cell count in the sample.Decimal PlacesnumberOptional

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Hemocytometer Cell Counter (cells/mL)

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Examples

1. Four-square count with 1:1 trypan blue dilution

2. Five-square count with total cells in a 10 mL stock

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