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Calcimator

Cell Bank Calculator

Calculate vial count, expansion time, and storage requirements for master and working cell banks.

Inputs

%

Results

Total cells to grow

2,110,000,000

Population doublings11
Expansion time (days)11
Passages needed6
Total freeze volume (mL)200
Freeze medium needed (mL)220
Vial concentration (×10⁶/mL)10
How to Use This Calculator
  1. Enter starting cell count (×10⁶), target cells per vial (×10⁶), and total vials needed.
  2. Set cell doubling time (hours) and expected post-thaw viability (%).
  3. Enter freeze volume per vial (mL).
  4. Review Total Cells to Grow, Expansion Time (days), Passages Needed, and Total Freeze Volume (mL).
  5. Use Freeze Medium Needed (mL) to prepare your cryoprotectant formulation in advance.

How the result changes with Cells per vial (×10⁶)

Cells per vial (×10⁶)Total cells to grow
102,110,000,000
357,370,000,000
6513,700,000,000
9018,900,000,000

What each input means

Starting cells (×10⁶)
Number of initial cells to expand from (in millions). Typically from a thawed vial.
Cells per vial (×10⁶)
Target number of viable cells per cryovial (in millions). Typical: 5-20 × 10⁶.
Target number of vials
Number of cryovials to bank. MCB typically 100-300, WCB 200-500.
Doubling time (hours)
Cell population doubling time in hours. CHO: 18-24h, HEK293: 20-30h.
Post-thaw viability (%)
Expected cell viability after freeze-thaw. Good protocols: 90-98%.
Freeze volume per vial (mL)
Volume of cell suspension per cryovial in mL. Standard: 1.0-1.8 mL.

What each result means

Total cells to grow
Total cells needed before freezing (accounts for viability losses).
Population doublings
Number of cell doublings from start to target.
Expansion time (days)
Estimated time to expand cells assuming exponential growth.
Passages needed
Estimated number of cell passages (assuming 1:4 split ratio).
Total freeze volume (mL)
Total volume of cell suspension to freeze across all vials.
Freeze medium needed (mL)
Total freeze medium with 10% overage for pipetting losses.
Vial concentration (×10⁶/mL)
Final cell concentration in each cryovial.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Starting cells (×10⁶) = 1, Cells per vial (×10⁶) = 10, Target number of vials = 200, Doubling time (hours) = 24 = 6 input(s) provided
  2. Calculate Total cells to grow
    Total cells to grow = Number(totalCellsNeeded.toExponential(2))
    2110000000 = 2110000000
  3. Calculate Population doublings
    11 = 11
  4. Calculate Expansion time
    Expansion time = expansionTimeHrs / 24
    11 = 11

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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