Dilution Calculator

Name: Dilution Calculator
Author: Jitendra Kumar

Calculate stock volume, diluent volume, final concentration, final volume, or required stock strength with the C1V1 = C2V2 dilution equation.

Last Updated: April 26, 2026

Make solution

Find stock volume and diluent volume from stock concentration, target concentration, and final volume.

Stock Concentration (C1)

Stock Concentration Unit

Target Concentration (C2)

Target Concentration Unit

Final Volume (V2)

Final Volume Unit

Output Volume Unit

Output Concentration Unit

Target Concentration

Stock Volume (V1)

Diluent to Add

Final Volume (V2)

Dilution Factor

Formula Used

C1 x V1 = C2 x V2

Lab and Safety Notice

This dilution calculator is for educational and planning use. It does not replace lab SOPs, safety data sheets, clinical dosing instructions, sterile technique, hazardous-material controls, or regulated preparation requirements.

Reviewed For Methodology, Labels, And Sources

Every CalculatorWallah calculator is published with visible update labeling, linked source references, and founder-led review of formula clarity on trust-sensitive topics. Use results as planning support, then verify institution-, policy-, or jurisdiction-specific rules where they apply.

Reviewed By

Jitendra Kumar, Founder & Editorial Standards Lead, oversees methodology standards and trust-sensitive publishing decisions.

Review editor profile

Topic Ownership

Sales tax and tax-sensitive estimate tools, Education and GPA planning calculators, Health, protein, and screening-formula pages, Platform-wide publishing standards and methodology

See ownership standards

Methodology & Updates

Page updated April 26, 2026. Trust-critical pages are reviewed when official rates or rules change. Evergreen calculator guides are checked on a recurring quarterly or annual cycle depending on topic volatility.

Sources & methodology About the review process

How to Use the Dilution Calculator

Step 1: Choose what you want to solve
Pick whether you need stock volume, final concentration, final volume, or required stock concentration.
Step 2: Enter compatible concentration units
Use matching concentration bases, such as x with x, molarity with molarity, or mass-per-volume with mass-per-volume.
Step 3: Enter the known volumes
Use the volume fields required by the selected mode, then choose the output unit you want for the result.
Step 4: Review stock and diluent volumes
For solution preparation, measure the stock volume first and add diluent until the final volume mark is reached.

How the Dilution Formula Works

The calculator uses C1 x V1 = C2 x V2. The concentration of the stock solution multiplied by the volume of stock used equals the final concentration multiplied by the final solution volume. Rearranging that equation lets the tool solve for V1, C2, V2, or C1.

In the most common workflow, you know the stock concentration, the target concentration, and the desired final volume. The calculator solves V1 = (C2 x V2) / C1, then subtracts that stock volume from the final volume to estimate how much diluent is needed.

Concentration units are converted only when they describe the same basis. Molarity units can convert between M, mM, uM, and nM. Mass-per-volume units can convert between g/L, mg/mL, mg/L, ug/mL, percent w/v, ppm, and ppb with the stated assumptions. The calculator does not convert molarity into mg/mL because that requires molar mass.

Dilution Calculator Guide

What Is A Dilution Calculator?

A dilution calculator helps you prepare a weaker solution from a stronger stock solution. It is useful for buffers, reagents, disinfectant planning, classroom chemistry, biology labs, and any workflow where the final concentration and final volume matter.

The key distinction is that dilution changes concentration by adding solvent or diluent. It does not add more solute. If the target concentration is higher than the stock concentration, the task is no longer dilution and needs a different preparation method.

Scenario	Known values	Typical result
10x stock to 1x final	100 mL final volume	Use 10 mL stock and add diluent to 100 mL
1 M stock to 100 mM final	50 mL final volume	Use 5 mL stock and add diluent to 50 mL
5% w/v stock to 500 ppm final	1 L final volume	Use 10 mL stock and add diluent to 1 L
2 mg/mL stock, 1 mL into 10 mL	Find final concentration	Final concentration is 0.2 mg/mL

Supported Concentration Units

Use concentration units that describe the same measurement basis. For example, 1 M can be converted to 1000 mM, but it cannot be converted to mg/mL unless the solute's molar mass is known and used separately.

Unit family	Examples	Use case
Relative strength	10x to 1x	Best for buffers, media, concentrates, and stock labels written as x strength
Molarity	M, mM, uM, nM	Best for chemistry and biology solutions where amount-of-substance concentration is known
Mass per volume	g/L, mg/mL, mg/L, ug/mL	Best when stock labels describe mass of solute per solution volume
Percent w/v	%	Handled as percent weight/volume, where 1% w/v equals 10 g/L
ppm and ppb	ppm, ppb	Handled as dilute aqueous approximations comparable to mg/L and ug/L style work

Practical Preparation Notes

In many lab procedures, the diluent amount is not measured as a separate standalone volume. Instead, the usual instruction is to pipette or measure the stock solution, then add diluent until the solution reaches the desired final volume. That method avoids small volume-addition errors.

If your dilution is part of regulated, sterile, clinical, hazardous, or quality-controlled work, follow the approved procedure for that setting. This page gives the arithmetic, not the operational approval.

Common mistake	Why it matters
Mixing concentration bases	Do not combine molarity with mg/mL unless molar mass has been handled elsewhere
Adding stock plus diluent volume mentally	For most lab workflows, measure stock first and fill to final volume
Using a weaker stock than target	Dilution cannot make a solution more concentrated without adding solute
Treating ppm as universal	ppm assumptions depend on density and context; this calculator uses the common dilute-water approximation
Ignoring safety instructions	Chemical, biological, and disinfectant work may require PPE, ventilation, and approved procedures

Related Calculation Workflows

If you need to convert container sizes first, use the volume converter. If the problem depends on mass units before concentration is known, the weight and mass converter can help standardize the inputs.

Keep the research moving with Volume Converter, Mass Converter, Percentage Calculator, and Scientific Calculator.

Frequently Asked Questions

It uses C1 x V1 = C2 x V2, where C1 is stock concentration, V1 is stock volume, C2 is final concentration, and V2 is final volume.

Choose Make solution, enter stock concentration, target concentration, and final volume. The calculator returns V1, the stock volume to measure, plus diluent to add.

For most solution preparation, measure the stock volume first and then add diluent until the mixture reaches the final volume mark.

Yes. The calculator supports M, mM, uM, and nM, but keeps molarity separate from mass-per-volume units because converting between them requires molar mass.

Yes. Percent is treated as percent w/v, and ppm or ppb use the common dilute aqueous approximation. Verify the convention for regulated or safety-critical work.

That is not a dilution. You need a stronger stock, a concentration step, or a direct solute preparation method instead.

It handles each dilution step. For a serial dilution, calculate one step at a time or use the dilution factor to plan repeated equal-ratio steps.

No. This is an educational and lab-planning calculator. Medication, clinical, hazardous chemical, or regulated preparations need professional protocols and verification.