What Is 0.25% of a Startup Actually Worth? An Advisor Equity Calculator
A founder offers you 0.25% to join their advisory board, and it sounds either generous or insulting depending on the day. The honest answer is that the percentage tells you almost nothing until you do two pieces of arithmetic.
The one-line calculator
Equity is a slice of a number, and the number is the company's valuation. So the dollar value of your grant, on paper, is simply:
Your equity value = ownership percentage × company valuation.
That is the whole calculator. The catch is that valuation is not one fixed figure. It is whatever the company is worth at the moment you care about it. Today it might be a seed-stage startup worth $8M. If it sells for $200M in six years, the same percentage is worth twenty-five times more. So before you judge any offer, you have to translate the percentage into dollars across a range of outcomes, not a single one.
Here is what a 0.25% advisor grant looks like across a spread of exit valuations, holding the percentage fixed:
| Exit valuation | Value of 0.25% | Value of 0.5% | Value of 1% |
|---|---|---|---|
| $10M (small acquihire) | $25,000 | $50,000 | $100,000 |
| $50M (modest exit) | $125,000 | $250,000 | $500,000 |
| $200M (strong exit) | $500,000 | $1,000,000 | $2,000,000 |
| $1B (rare outlier) | $2,500,000 | $5,000,000 | $10,000,000 |
The table is illustrative, not a forecast. Its only job is to show you the shape of the bet: the same grant swings from the price of a used car to life-changing money depending entirely on an outcome nobody can promise you.
Now subtract dilution
The table above quietly cheats, because it assumes you still own 0.25% at exit. You almost certainly will not. Every time the company raises a new round and issues new shares, your percentage shrinks. This is dilution, and it is the single most misunderstood part of an equity offer.
Dilution is not theft and it is not a sign of a bad deal. When a company sells 20% of itself to new investors in a Series A, everyone who already held shares — founders, employees, you — gets diluted by roughly that 20%. Your slice gets thinner, but the pie it is a slice of just got bigger and better funded. The hope is that the larger pie more than makes up for your smaller share.
The practical effect is that a percentage granted at the seed stage erodes meaningfully by the time the company exits. As a rough mental model, an early grant can be diluted by something like half or more across multiple later rounds. So a clean way to sanity-check an offer is to discount it:
- Start with the headline grant. 0.25% today.
- Apply a dilution haircut for future rounds. If you assume your stake gets cut roughly in half over the company's life, plan around 0.125% at exit, not 0.25%.
- Then multiply by the exit valuation. 0.125% of a $200M exit is $250,000, not the $500,000 the undiluted table promised.
None of these numbers are precise, and they are not supposed to be. The point is to stop yourself from valuing an advisor grant at its undiluted, best-case, top-of-the-table figure — which is the mistake almost everyone makes when the offer first lands.
Vesting decides how much you actually keep
There is one more filter between the grant and your bank account: vesting. Advisor equity almost never lands in your account all at once. It vests over time, commonly across one to two years, sometimes with a short cliff before any of it is yours.
This matters because advisory relationships are loose and quiet by nature. If you drift away after four months of a two-year vest, you walk with a fraction of the grant. So when you value an offer, you are really valuing the portion you expect to vest given how long you genuinely plan to stay engaged. A 0.25% grant you only see a quarter of is, for valuation purposes, closer to 0.06%.
The reasonable move is to match the vesting schedule to the real commitment. Monthly vesting with no cliff is friendlier to an advisor than an annual cliff, because advisory work is incremental and you should accrue value the same way you deliver it.
How much equity is normal for an advisor
To know whether an offer is fair, you need a sense of the typical band. Formal advisor grants are usually small — most sit somewhere between 0.1% and 1% of the company, scaled to how early the company is and how involved you will be.
| Involvement | Typical equity range |
|---|---|
| Light: occasional calls, intros, a name on the site | 0.1% – 0.25% |
| Standard: monthly meetings, ongoing guidance | 0.25% – 0.5% |
| Heavy: deep, hands-on, near-fractional involvement | 0.5% – 1%+ |
These are typical market ranges, not rules. The earlier and riskier the company, the more equity you should expect for the same effort, because the odds of any payout are lower and your slice is more likely to be diluted to little. A later-stage company with a real valuation should be offering you a smaller percentage — but each point is worth far more in dollars and far more likely to convert.
The question the calculator is really answering
Run the full chain and the headline percentage almost always shrinks: grant, minus dilution, minus the unvested portion, times an exit that may never come. A 0.25% offer that looked like a possible $500,000 is more honestly a lottery ticket with an expected value of a few thousand to a few tens of thousands, weighted by a probability of exit that is, for most startups, low.
That is not an argument against taking advisor equity. It is an argument for pricing it honestly and not letting it stand in for real compensation. Equity is upside. If the advisory work is meaningful and ongoing, it is fair to expect cash alongside it — a modest retainer or a per-meeting rate — rather than betting your time entirely on a number that has to survive dilution, vesting, and an exit to mean anything. The equity is the bonus if it hits. The cash is what respects your time today.
Most of these arrangements still get negotiated in the dark, which is how good advisors end up underpaid and uncertain. ExecRoster is built to fix that: you publish a profile that states what you do, what you charge, and the terms you work on — cash, equity, or both — so companies come to you already knowing the deal, and you keep about 90% of what you book with no recruiter in the middle. Put your terms in the open, and let the math work in your favor for once.