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Cell Seeding CalculatorSplit Ratio & PassagingHemocytometer Helper

Cell Plating Calculator & Culture Split Ratio

Calculate master mix volumes, cell stock suspension aliquots, and passaging split ratios for 96-well plates, 6-well plates, culture dishes, and T-flasks.

Cell Seeding / Plating

Calculate master mix volumes and cell suspension aliquots for uniform well-to-well plating.

e.g., 1.5e6 or 1500000

Default 10%; adjust within 0–50% for your equipment.

Plating Master Mix Recipe

88 µL stock+1.232 mL medium=1.32 mL
12 × 0.1 mL dispensed; plus 10% excess
Density / Well:1.00 × 10⁴ cells
Total Cells Required (+10%):1.32 × 10⁵ cells
Total Master Mix Volume:1.32 mL

Step-by-Step Preparation Protocol

1
Volume of Fresh Medium to Add:
1.232 mL
2
Volume of Cell Stock to Add:
88 µL
3
Mix thoroughly by inverting, then dispense 0.1 mL into each of the 12 wells.
A well-mixed suspension helps consistency; cell settling, pipetting variation and evaporation still need control.

Core Cell Plating Equations

1. Total Required Cells

Total cells = wells × cells/well × (1 + excess% / 100)

2. Volume of Cell Stock

Stock volume (mL) = total cells ÷ stock concentration (cells/mL)

3. Volume of Fresh Medium

Medium volume = final mix volume − stock volume

4. Hemocytometer Formula

cells/mL = (viable cells counted ÷ large squares) × 10⁴ × dilution factor

Example Vessel Areas and Working Volumes

Areas and volumes vary by manufacturer. Cell counts are illustrative, not recommendations for every cell line. Use your vessel specifications and validated cell-line protocol.

Culture VesselGrowth Area (cm²)Example Working VolumeIllustrative Cell Counts
96-well plate0.32 cm²0.1 – 0.2 mL0.5 – 2 × 10⁴ cells
48-well plate0.95 cm²0.25 – 0.5 mL2 – 5 × 10⁴ cells
24-well plate1.9 cm²0.5 – 1.0 mL0.5 – 1 × 10⁵ cells
12-well plate3.8 cm²1.0 – 2.0 mL1 – 2 × 10⁵ cells
6-well plate9.5 cm²2.0 – 3.0 mL2.5 – 5 × 10⁵ cells
35 mm dish8.8 cm²2.0 mL2 – 4 × 10⁵ cells
60 mm dish21.0 cm²4.0 – 5.0 mL0.5 – 1 × 10⁶ cells
100 mm dish55.0 cm²10.0 – 12.0 mL1.5 – 3 × 10⁶ cells
150 mm dish148.0 cm²20.0 – 30.0 mL4 – 8 × 10⁶ cells
T-25 flask25.0 cm²5.0 – 7.0 mL0.5 – 1 × 10⁶ cells
T-75 flask75.0 cm²15.0 – 20.0 mL1.5 – 3 × 10⁶ cells
T-175 flask175.0 cm²30.0 – 35.0 mL3 – 6 × 10⁶ cells
T-225 flask225.0 cm²40.0 – 50.0 mL4 – 8 × 10⁶ cells

Before you dispense

1Keep the suspension mixed

Cells can settle during dispensing. Gently remix as appropriate for your cell line and avoid bubbles. A master mix helps consistency but does not eliminate pipetting error.

2Control evaporation

Edge wells can behave differently because of evaporation. Follow a validated plate layout and humidity protocol; reserving perimeter wells may help some assays.

3Check distribution

Use the mixing and plate movement recommended for your cell line. Inspect the distribution rather than assuming a fixed motion guarantees uniform seeding.

4Set an appropriate excess

The default 10% is a planning allowance. Choose it from your reservoir and pipette losses; small batches may need a different value.

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