How to split equity between co‑founders

Most founding teams split equity with a handshake and a spreadsheet. Someone proposes a round number, everyone nods, and the conversation ends before it starts. Two years later, someone asks what was actually agreed, and the only answer is a number nobody can explain.

That's not an arithmetic problem. It's a process problem.

A calculator gives you a number. A process of record gives you an agreement: weights the team negotiated, private peer assessment, one computed result with a category breakdown, and unanimous approval with a timestamp. That's what Pie Divide runs, and this guide walks through it step by step.

#Why so many teams split equally

Hellmann and Wasserman studied 1,476 founders across 511 ventures. Roughly 1 in 3 founding teams divided their equity equally. The same study estimates the value at stake in that one decision at around 10% of the firm, or about a quarter of the average founder's stake. (Hellmann and Wasserman, Management Science 63(8).)

An equal split is sometimes exactly right. The problem is reaching for it because it ends an uncomfortable conversation fastest. If nobody agreed what should count, nobody assessed contribution, and nobody recorded approval, the team doesn't have a split it can defend. It has a truce.

A second study followed eight founding teams for six months. Whether the split was felt to be just, not how large anyone's share was, predicted whether the team spiraled upward or downward. (Breugst, Patzelt and Rathgeber, Journal of Business Venturing 30(1).)

So the goal isn't a cleverer formula. The goal is a decision every founder can stand behind later.

#Three ways teams decide, and what each one leaves behind

Handshake or spreadsheet. Usually one person types a number. You get a cell in a sheet. You don't get a record of what anyone agreed to, or why.

An online equity calculator. One person, one browser tab, self-scored. You get an instant percentage. Nothing is saved when the tab closes, and nobody else's view is in it.

Dynamic equity models, such as Slicing Pie. Ownership keeps adjusting as contributions accrue over time. That suits teams that want a moving split. It's a different goal from a fixed, approved agreement.

A process of record (Pie Divide). Every founder takes part from their own account. Weights are negotiated before scoring. Peer assessment outweighs self-assessment. The split is final only when everyone approves, and you keep the history of how you got there.

If you want a number you typed alone, a calculator is fine. If you want something you can show a lawyer, an investor, or a co-founder who remembers it differently, you need a process.

#The four phases

Every phase needs every founder. There's no majority vote, no override, and no time limit that decides for you. The full mechanics are on How it works.

#1. Setup

One founder creates the project and invites the others by email. Everyone signs in to their own account. Nobody fills anything in on anyone else's behalf.

Every project starts from a standard set of weights that covers what most businesses run on: Investment 40%, Execution 21%, Core Idea 19%, Technology 5.5%, Culture and Values 4.5%, Growth Planning 4%, Legal 3%, Human Resources 3%. The weights must total exactly 100% before anything starts. Here's what each standard weight measures.

#2. Negotiation

Before anyone is scored, the team agrees what counts and how much. A weight can't simply go up. A change is an exchange: whatever one item gains, another item gives up. A founder proposes a change and says why, and nothing moves until a co-founder accepts it.

The questionnaire doesn't open until every founder has approved the current weights. If a number moves, earlier approvals stop counting and everyone is asked again. Nobody is ever recorded as agreeing to numbers they didn't see.

#3. Questionnaire

Each founder privately scores themselves and every co-founder on every item, from 1 to 10. Partial answers are rejected, and no result is computed until everyone has submitted.

Your own score counts for less than your co-founders' scores. In a three-founder team, your self-assessment carries 20% of your mark on an item and your two co-founders carry 80%. Rating yourself a ten can't outvote the room. Nobody ever sees which co-founder gave which score.

#4. Results and approval

The split is computed once and stored. Each founder sees their percentage and how every category contributed to it, not a single unexplained number.

The split isn't final until every founder approves. Anyone can dispute instead, give a reason, and open a new round. The earlier result and the record of who approved or objected stay in the project beside the new one.

That last gate is the point. A split that three out of four founders liked is exactly the outcome this process is built to prevent.

#What you walk away with

1. The split itself. Each founder's percentage and the category contributions behind it.
2. How you got there. The weights you agreed, who proposed what, what was accepted or rejected, and every round you ran.
3. Who agreed, and when. Every approval, timestamped against the exact version of the weights on screen at the time.

That record is what a calculator can't give you, and it's what matters the day someone questions the decision.

Finalizing is a one-way door. A finalized project can be archived but not reopened, which is what makes the record worth something. If your circumstances change enough to need a new answer, you start a new project.

#After the split

Finalizing puts a dated checklist in front of the team: incorporate, get an EIN, open a bank account, the 83(b) window, founder agreements. Dates are a starting point, not advice about your situation, and deadlines vary by entity and state.

Pie Divide is not a law firm and does not draft, sign, or file anything. Turning your percentages into shares and a signed founder agreement is the next step, with a lawyer. Vesting sits on top of whatever split you agree here and is set in those documents.

#What it costs

• Free: every phase, with your real co-founders, on the standard weights. Unlimited co-founders. No card.
• Custom, $49.99 one-time upgrade per project: set your own weights, add your own categories and items, and use twelve industry templates. No subscription, and no percentage of anything.

You can upgrade at any point, including part-way through, and your work is kept. If the standard weights already describe your company, the free version gives you the same split. Details are on Pricing.

#Who this is for

Pre-incorporation startups, agencies and studios, trades and construction partnerships, and professional practices. Anyone going into business with someone else has to divide ownership, and the conversation is the same.

#How to run it this week

1. Create a free account and start a project.
2. Invite every co-founder to their own account.
3. Approve the standard weights together, or upgrade to set your own.
4. Score privately, review the result, then approve or dispute and run another round.
5. Take the finalized record to your lawyer when you're ready to paper shares.

Most teams can finish a first free run in roughly an hour.

#Start your free split

Run all four phases with your real co-founders on the standard weights. No card required.

Run a free split

Want the mechanics first? Read How it works or see Pricing.

Pie Divide is not a law firm and does not provide legal, tax, or financial advice.