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
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 Vessel | Growth Area (cm²) | Example Working Volume | Illustrative Cell Counts |
|---|---|---|---|
| 96-well plate | 0.32 cm² | 0.1 – 0.2 mL | 0.5 – 2 × 10⁴ cells |
| 48-well plate | 0.95 cm² | 0.25 – 0.5 mL | 2 – 5 × 10⁴ cells |
| 24-well plate | 1.9 cm² | 0.5 – 1.0 mL | 0.5 – 1 × 10⁵ cells |
| 12-well plate | 3.8 cm² | 1.0 – 2.0 mL | 1 – 2 × 10⁵ cells |
| 6-well plate | 9.5 cm² | 2.0 – 3.0 mL | 2.5 – 5 × 10⁵ cells |
| 35 mm dish | 8.8 cm² | 2.0 mL | 2 – 4 × 10⁵ cells |
| 60 mm dish | 21.0 cm² | 4.0 – 5.0 mL | 0.5 – 1 × 10⁶ cells |
| 100 mm dish | 55.0 cm² | 10.0 – 12.0 mL | 1.5 – 3 × 10⁶ cells |
| 150 mm dish | 148.0 cm² | 20.0 – 30.0 mL | 4 – 8 × 10⁶ cells |
| T-25 flask | 25.0 cm² | 5.0 – 7.0 mL | 0.5 – 1 × 10⁶ cells |
| T-75 flask | 75.0 cm² | 15.0 – 20.0 mL | 1.5 – 3 × 10⁶ cells |
| T-175 flask | 175.0 cm² | 30.0 – 35.0 mL | 3 – 6 × 10⁶ cells |
| T-225 flask | 225.0 cm² | 40.0 – 50.0 mL | 4 – 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.