Passage Dilution Ratio Calculator (1:N)

Passage Dilution Ratio Calculator (1:N) | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Education
Input types: select, number
Output type: json
Sample coverage: 4
API ready: Yes

Overview

The Passage Dilution Ratio Calculator (1:N) calculates a cell culture split ratio from current and target viable-cell densities. In volume mode, it also calculates the culture volume to keep and the fresh medium to add, with optional passage doublings and equivalent doubling time. Educational use only.

When to use

Determine the 1:N passage ratio needed to reach a target cell density.
Calculate how much of an existing culture to keep and how much fresh medium to add.
Estimate doublings between passages when the interval to the next passage is known.

How it works

1Enter the current viable-cell density and the desired target density in cells/mL.
2Choose Ratio only to calculate the split ratio, or Split a specific volume to include volume calculations.
3In volume mode, enter the total culture volume to calculate the volume to keep and fresh medium to add.
4Optionally enter the passage interval and decimal places to estimate doublings and equivalent doubling time.

Use cases

Plan routine adherent-cell subcultures by converting measured density into a practical 1:2 to 1:5 split.
Prepare fast-growing suspension-cell passages with larger dilution ratios such as 1:10.
Calculate keep and fresh-medium volumes for a defined flask or culture volume.

Examples

1. Plan a 1:10 passage for a 10 mL culture

Cell culture researcher

Background

A 10 mL culture has a viable-cell density of 2,000,000 cells/mL, and the next flask should be seeded at 200,000 cells/mL.

Problem

Determine the passage ratio and the volumes needed to maintain a 10 mL total culture volume.

How to use

Select Split a specific volume, enter 2,000,000 for current density, 200,000 for target density, and 10 mL for culture volume. Enter 48 hours if an interval estimate is needed.

{"mode":"volume","currentDensity":2000000,"targetDensity":200000,"cultureVolumeMl":10,"intervalHours":48,"decimalPlaces":2}

Outcome

The calculator returns a 1:10 split: keep 1 mL of the existing culture and add 9 mL of fresh medium. With a 48-hour interval, it estimates 3.32 doublings and a 14.45-hour doubling time.

2. Calculate a ratio-only 1:3 split

Laboratory trainee

Background

A culture is measured at 1,200,000 cells/mL, while the desired reseeding density is 400,000 cells/mL.

Problem

Find the dilution ratio without calculating specific culture volumes.

How to use

FAQ

What does a 1:N passage ratio mean?

It means one part of the existing culture is reseeded into a total of N parts at the target density.

How is the split ratio calculated?

The calculator divides the current density by the target density: N = current density ÷ target density.

What does volume mode calculate?

It calculates the volume to keep from the existing culture and the fresh medium needed to maintain the entered total volume.

What are doublings between passages?

They estimate the number of cell doublings represented by the split ratio using n = ln(N) ÷ ln(2).

Is this calculator suitable for clinical decisions?

No. It is intended for education and experimental planning, not clinical or diagnostic decisions.

{"mode":"ratio","currentDensity":1200000,"targetDensity":400000,"cultureVolumeMl":10,"intervalHours":0,"decimalPlaces":2}

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Plan a 1:10 passage for a 10 mL culture

2. Calculate a ratio-only 1:3 split

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