Startup Funding Dilution Calculator

Q: What is the difference between pre-money and post-money valuation?

Pre-money valuation is the company's value before the new investment is added. Post-money valuation is pre-money plus the new investment amount — the new investor's ownership percentage is calculated as their investment divided by the post-money valuation, not the pre-money figure.

Q: Does an ESOP pool top-up dilute founders more than the direct investment does?

It can meaningfully add to founder dilution — if the round requires expanding the ESOP pool as part of the deal, that additional dilution is typically borne by existing shareholders (often disproportionately by founders) on top of the dilution from the new investor's stake itself.

Calculate funding dilution

Investor ownership

—

Founder post-round ownership

—

Post-money valuation	—
Approximate pool top-up dilution	—

Pre-money option-pool mechanics can materially change founder dilution.

How This Is Calculated

This calculator computes post-money ownership after a funding round: new investor percentage = investment ÷ post-money valuation (pre-money plus investment) — and additionally accounts for any ESOP pool top-up required as part of the round, which further dilutes existing shareholders beyond the direct investor dilution alone.

Frequently Asked Questions

What is the difference between pre-money and post-money valuation? ▼

Does an ESOP pool top-up dilute founders more than the direct investment does? ▼

Evidence and verification checklist

Confirm the current, in-force text governing Startup Funding Dilution Calculator on the official source linked above - the summary on this page is an implementation aid, not a substitute for it.
Record the exact event/transaction date, since the applicable version of the law, form or threshold can change between the date of the underlying event and today.
Preserve the primary documents (notices, applications, orders, acknowledgements) that would let a reviewer reconstruct how the facts were classified and what was actually done.
Check for a State-specific rule, later amendment or binding judicial decision that may modify how this applies on your facts.

Before relying on this page

This page is a structured implementation summary, not the operative legal text. Portal or process acceptance of a filing does not by itself establish legal compliance - the underlying classification, authority, evidence and timeline still have to be independently correct. Where the facts are contested, high-value, or time-barred if delayed, verify the current position with the official source and, where appropriate, a qualified professional before acting.

Methodology, assumptions and sources

Scope: Projects a founder's or early stakeholder's ownership percentage across multiple future funding rounds, showing cumulative dilution.

Calculation logic

For each round entered, compute new shares issued = Round investment amount ÷ Price per share (derived from the entered pre-money valuation ÷ pre-round fully diluted share count).

Update each stakeholder's ownership percentage = Their unchanged share count ÷ New total share count after the round (including any ESOP pool top-up entered for that round).

Repeat sequentially for each subsequent round entered, carrying forward the prior round's post-money cap table as the starting point for the next round, to project cumulative dilution across the full funding sequence.

Inputs and assumptions

Uses the fully-diluted share count convention (including ESOP pool) for price-per-share calculations at each round, consistent with standard venture financing practice.

Assumes straightforward priced equity rounds — convertible notes/SAFEs are only modelled if the user enters their converted share equivalent at the relevant round.

Exclusions and edge cases

Does not model liquidation preferences, participation rights or anti-dilution ratchets — this is an ownership-percentage dilution projection, not a full return-waterfall model.

Down rounds and their specific anti-dilution mechanics (broad-based/narrow-based weighted average, full ratchet) are not automatically applied unless the user manually adjusts the share price for that round.

Sources

No external regulatory source applies — this is a general financial formula, not a statutory computation.

Review status: reviewed and approved by CA Nikhil Gupta on 17 July 2026.