Calculate your equity split based on real contributions.
Dynamic equity adjusts ownership based on what each person actually contributes—cash, time, or both. Move the sliders to see how your split changes.
Ownership Split
How should cash and time be weighted?
Cash is after-tax, already-earned money with real opportunity cost. Because it carries more financial risk, it typically translates to more shares than sweat equity.
How shares are calculated:
• Cash × multiplier = shares
• Hours × hourly rate = shares
Example:
• $10,000 cash invested × 2 = shares
• 100 hrs contributed × $100/hr = 10,000 shares
Ownership Split
How should cash and time be weighted?
Cash is after-tax, already-earned money with real opportunity cost.
How shares are calculated:
• Cash × multiplier = shares
• Hours × hourly rate = shares
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How the dynamic equity calculator works.
This calculator models a dynamic equity split — where ownership is determined by what each person actually contributes, not by a number someone picked on day one. You add team members, enter their cash invested and hours worked, set an hourly rate that reflects the market value of their role, and the calculator computes each person's ownership percentage based on their weighted contribution.
The time-versus-cash weighting slider controls how much more (or equally) cash contributions count relative to time. Cash carries real opportunity cost — it's after-tax money that could be earning returns elsewhere — so most teams weight it higher. At the default 2x setting, every dollar invested earns twice as many shares as a dollar's worth of time. You can slide this anywhere from equal weighting up to 4x to match your team's situation.
The result is a founder equity split grounded in contribution data rather than gut feel. The "Equal" column shows what a traditional equal split would look like. The "Dynamic" column shows what each person has actually earned. When those two numbers diverge, it means someone is being over- or under-compensated — exactly the kind of imbalance that leads to co-founder conflict down the road.
When to use a dynamic equity calculator.
Starting a company with co-founders
Before you default to a 50/50 split, run the numbers. Even if you plan to contribute equally, modeling it first sets a precedent: ownership is earned, not assumed. If contributions stay balanced, the split stays equal. If they don't, you'll catch it early.
Bringing on a co-founder after starting solo
You've already put in months of work and possibly cash. A new co-founder shouldn't get the same stake as someone who took the initial risk. This calculator helps you quantify what you've already contributed so the new person's equity reflects their actual starting point.
Adding a partner to an existing business
When you bring a partner into a business that already has revenue or traction, guessing at a fair percentage is risky. Use the calculator to model what their ongoing contributions are worth relative to what you've already built. For a deeper comparison approach, see our Slicing Pie calculator.
Restructuring an unfair equity split
If your current split no longer reflects reality — one person is doing most of the work but owns half the company — this calculator gives you data to start the conversation. Share the results link with your co-founder so you're both looking at the same numbers, not trading accusations.
Dynamic equity vs. fixed equity splits.
A fixed equity split is what most founding teams do: negotiate a percentage on day one, shake hands, and move on. Sometimes it's an equal split, sometimes it's based on who had the idea or who's putting in more cash. The problem is that fixed splits lock in a ratio before anyone knows how the work will actually divide up. Six months later, contributions have shifted but ownership hasn't.
Dynamic equity takes the opposite approach. Instead of picking a number upfront, ownership adjusts over time based on what each person contributes — hours, cash, intellectual property, or other agreed-upon inputs. If someone reduces their involvement, their share of future equity decreases. If someone steps up, they earn more.
For early-stage teams where roles are still forming and commitment levels are uncertain, contribution-based splits reduce the risk of resentment and dead equity. You're not betting on future behavior — you're measuring actual behavior and letting the math follow. Learn more about how to split equity fairly as a founding team.
From calculator to real equity tracking.
This calculator shows you a snapshot — one moment in time based on the numbers you enter. But real equity management is ongoing. Contributions change month to month. People join, people leave, roles shift. A spreadsheet or a one-time calculation can't keep up with that.
Equity Matrix tracks contributions continuously, recalculates ownership automatically, handles departures and role changes, and generates the agreements you need to make it legally binding. If this calculator confirmed that contribution-based equity makes sense for your team, the next step is putting it into practice.
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