How It Works
This calculator works in 4 steps.
Enter the total cell density
Type total cells/mL from the count.
Enter the viability
Type the percent of live cells.
Enter the target and volume
Type the viable cells/mL target and the final volume.
Read the suspension volume
The calculator returns suspension and medium volumes based on viable cells.
The Formula
The formula multiplies total density by viability, then applies C₁V₁ = C₂V₂ to viable cells.
C_viable = C_total × V% / 100V₁ = C_target × V₂ / C_viable- C_total:
- Total cell density
- V%:
- Viability percent
- C_viable:
- Viable cell density
- C_target:
- Target viable density
A count of 3 × 10⁶ cells/mL at 80% viability holds 2.4 × 10⁶ viable cells/mL. For 5 mL at 1 × 10⁶ viable cells/mL, use 2.08 mL suspension.
Conversion Table
The conversion table gives viable density and suspension volume for 5 counts (cells/mL).
| Total density | Viability | Viable density | Target viable | Suspension volume |
|---|---|---|---|---|
| 2 × 10⁶ | 95% | 1.9 × 10⁶ | 5 × 10⁵ | 2.632 mL |
| 3 × 10⁶ | 80% | 2.4 × 10⁶ | 10⁶ | 2.083 mL |
| 1.5 × 10⁶ | 70% | 1.05 × 10⁶ | 2 × 10⁵ | 3.81 mL |
| 8 × 10⁶ | 90% | 7.2 × 10⁶ | 2 × 10⁶ | 2.778 mL |
| 5 × 10⁵ | 60% | 3 × 10⁵ | 10⁵ | 5 mL |
What Is the Viable Cell Dilution Calculator?
The Viable Cell Dilution Calculator is a tool that dilutes a cell suspension to a target density of live cells, using the measured viability to convert total count into viable count. The viable density equals the total density multiplied by the viability fraction.
Trypan blue and fluorescent dyes report viability as a percent. Dosing cells on total count instead of viable count under-delivers live cells, by 30% at 70% viability. The calculator applies viability first, then solves the dilution on viable cells/mL.
Common Uses
There are 5 main uses of this calculator.
Primary cells
Users dose primary cells with variable viability.
Cell therapy manufacturing
Process teams dose viable cells per specification.
Cytotoxicity assays
Labs set viable target cell numbers.
Post-thaw dosing
Users correct for viability loss after thawing.
Bioreactor seeding
Engineers seed reactors at viable cell targets.