Calculator Inputs
Formula Used
Contribution points are calculated for each founder. The formula is:
Total points = role score × role weight + time score × time weight + idea score × idea weight + risk score × risk weight + cash contribution ÷ cash per point + sweat hours ÷ hours per point + deferred salary ÷ salary per point.
Pre pool equity = founder points ÷ total founder points × 100. After that, the calculator subtracts the option pool reserve and outside dilution. Vested equity equals final diluted equity multiplied by vesting progress.
How to Use This Calculator
- Enter company valuation and total share base.
- Add option pool and investor dilution assumptions.
- Set vesting years, cliff months, and elapsed months.
- Adjust scoring weights to match your startup situation.
- Enter each founder name, scores, cash, hours, and deferral.
- Press Calculate Equity to view the split above the form.
- Use CSV or PDF buttons to save the result.
Example Data Table
| Founder Type | Role | Time | Idea | Risk | Cash | Hours | Deferral |
|---|---|---|---|---|---|---|---|
| Technical founder | 9 | 10 | 8 | 9 | 15000 | 600 | 20000 |
| Commercial founder | 8 | 9 | 4 | 8 | 8000 | 520 | 15000 |
| Capital founder | 7 | 6 | 2 | 6 | 25000 | 250 | 5000 |
Founder Equity Planning Guide
Why Equity Needs Structure
Equity planning is hard because every founder brings different value. One person may bring the idea. Another may build the product. Another may bring sales, capital, or strong networks. A simple equal split can feel fair on day one. It can feel unfair after months of unequal work.
How the Model Helps
This calculator gives structure to that early discussion. It converts key inputs into contribution points. The model uses role value, time commitment, idea ownership, personal risk, cash support, sweat hours, and salary deferral. Each input can be weighted. That makes the tool useful for many startup styles.
Use Results Carefully
Use the first result as a discussion base. Do not treat it as a final legal split. Founder equity should also consider vesting, cliffs, buyback terms, intellectual property, tax rules, and written agreements. These items need professional review before shares are issued.
Dilution and Option Pools
The option pool setting shows how employee or advisor reserves reduce founder ownership. The outside dilution field shows how a funding round may lower each founder percentage. These two steps help founders see the effect of growth plans before signing anything.
Vesting Protection
Vesting is another important part of the estimate. A four year schedule with a one year cliff is common. The calculator shows vested and unvested equity based on elapsed months. This helps reduce risk when a founder leaves early.
Team Discussion
Good equity planning builds trust. It also reduces future conflict. Share the output with all founders. Then adjust weights together. Focus on facts, expected work, and actual risk. A transparent method is better than a rushed guess.
Limits of Any Calculator
No calculator can know every detail. Strategic value, market access, patents, execution skill, and timing may change the final answer. Still, a clear model gives your team a fair starting point. It makes hidden assumptions visible. It also creates a record that can be reviewed when roles change.
Before Finalizing Shares
Before using final numbers, prepare a written founder agreement. Define vesting, decision rights, departures, repurchase terms, and dispute steps. Keep ownership records clean from the beginning. Clear records make fundraising, hiring, and taxes easier later.
Review Over Time
Review the split again after major changes. New capital, a pivot, or changing workloads can shift fairness. Revisit assumptions with care. Protect relationships as much as percentages. Document every update in plain language.
FAQs
1. What is a co founder equity calculator?
It estimates startup ownership between founders. It compares contribution scores, cash, sweat work, risk, vesting, option pools, and dilution. The result supports discussion, not final legal issuance.
2. Should founders always split equity equally?
Equal splits can work when founders contribute similar value and risk. Unequal splits may be better when roles, time, cash, or opportunity cost differ greatly.
3. What is an option pool?
An option pool reserves shares for employees, advisors, or future hires. It usually reduces founder ownership because part of the company is set aside before or during financing.
4. What does dilution mean?
Dilution means each founder owns a smaller percentage after new shares are issued. Fundraising, option pools, and new grants can all dilute ownership.
5. Why include vesting?
Vesting protects the company when a founder leaves early. It lets ownership build over time instead of giving all shares immediately.
6. What is a cliff period?
A cliff is the first period before any equity vests. If a founder leaves before the cliff ends, they may receive no vested equity.
7. Can cash contributions decide the whole split?
Cash matters, but it should not be the only factor. Skill, time, risk, execution, and deferred pay can be equally important for early growth.
8. Is this calculator legal advice?
No. It is only an estimating tool. Always consult qualified legal and tax professionals before issuing shares or signing founder agreements.