The Dilution Calculator is a free tool that helps you calculate dilution using the formula After % = your shares / (existing + new shares) x 100. Enter your values above and press Calculate to get ownership before, ownership after instantly, with a full step-by-step breakdown.
What is the Dilution Calculator?
The dilution calculator is a free online tool that helps you calculate dilution quickly and accurately. It applies the standard formula After % = your shares / (existing + new shares) x 100 to the values you enter and, when you press Calculate, displays the result together with a clear, step-by-step explanation of how the answer was reached.
How to use the Dilution Calculator
- Enter total existing shares and new shares issued.
- Enter your holding.
- See your diluted ownership.
Formula used
The dilution calculator is based on this formula:
After % = your shares / (existing + new shares) x 100Each term in the formula corresponds to one of the inputs explained below. The calculator performs the arithmetic for you and shows every step so you can check the working by hand if you wish.
Worked example
Suppose you enter 100000 + 25000, you 20000. The calculator works as follows:
| Inputs | 100000 + 25000, you 20000 |
|---|---|
| Working | 20000/125000 |
| Result | 16% after |
Step-by-step calculation
- Apply the formula:
After % = your shares / (existing + new shares) x 100 - Substitute your values: 20000/125000
- Read the result: 16% after
Inputs explained
- Existing shares — the existing shares used in the calculation.
- New shares issued — the new shares issued used in the calculation.
- Your shares — the your shares used in the calculation.
Understanding your result
- Ownership before — the calculated ownership before in %.
- Ownership after — the calculated ownership after in %.
Benefits and practical uses
The dilution calculator saves time and removes the risk of manual errors when you need to calculate dilution. It is useful for students, professionals and anyone who wants a fast, dependable answer. Results update the moment you press Calculate, work on any device, and can be copied or shared in a single click — and because the maths runs in your browser, your figures stay completely private.
Tips for an accurate result
- Keep all related inputs in the same units.
- Use the worked example above to confirm you are entering values in the right places.
- Review the assumptions below so the result fits your situation.
- Press Reset to clear everything and try a different scenario.
Common mistakes to avoid
- Entering values in the wrong unit (mismatched units give wrong answers).
- Leaving a required field empty — the calculator will ask you to fill it in.
- Confusing the annual rate with a monthly rate, or tenure in years with months.
- Treating the estimate as a guaranteed return — markets and rates vary.
Assumptions and limitations
- Single funding round.
Frequently asked questions
What is dilution?
The fall in existing owners' percentage when a company issues new shares.
How do I use the Dilution Calculator?
Enter your values in the fields, then press the Calculate button to see the result. Use Reset to clear the form and start again. Nothing is calculated until you click Calculate.
What formula does the Dilution Calculator use?
It uses the standard formula: After % = your shares / (existing + new shares) x 100. The full step-by-step working is shown with every result so you can verify it.
What information do I need to use the dilution calculator?
You need: existing shares, new shares issued, your shares. Sensible example values are pre-filled so you can see how it works.
Is the Dilution Calculator free to use?
Yes. Every DigiToolkit calculator is completely free, with no sign-up, no login and no usage limits.
Does the Dilution Calculator work on mobile phones?
Yes. The calculator is mobile-first and works on phones, tablets and computers in any modern browser.
Do I need to install an app?
No. The dilution calculator runs directly in your web browser — there is nothing to download or install.
Is my data private when I use this calculator?
Yes. All calculations run inside your browser. The numbers you enter are never uploaded to a server or shared with anyone.
How accurate is the Dilution Calculator?
It uses the generally accepted formula for dilution and computes to several decimal places. Results are accurate for the assumptions listed on this page.
Can I copy or share my result?
Yes. After calculating, use the Copy button to copy the result, or Share to copy the page link.
Why is nothing showing until I press Calculate?
By design, the calculator only computes when you press Calculate, so you can finish entering all your values first. Press Reset any time to clear everything.
Does the Dilution Calculator give financial advice?
No. It provides estimates for general information only and is not financial advice. Returns and figures are illustrative — consult a qualified adviser before making decisions.