Founder tools
Free calculators and templates for the numbers that run a company: what a round costs you, what you owe the IRS, whether your ads pay, how to price, and the paperwork to send a customer or supplier.
Fundraising and equity
- SAFE calculatorOwnership at the cap, and what your SAFEs convert into when the priced round lands.
- Convertible note calculatorAccrued interest, cap vs. discount, and the noteholder’s stake after conversion.
- Post-money valuation calculatorPre-money, post-money and ownership — including what a Shark Tank ask implies.
- Startup dilution calculatorFounder ownership round by round, with the option-pool shuffle modelled.
- Liquidation preference calculatorThe exit waterfall: who gets paid first, and what founders take home.
- Burn rate & runway calculatorGross and net burn, months of runway, and whether growth gets you to break-even first.
Taxes and retirement
- Self-employment tax calculatorSE tax, income tax on your 1099 profit, what to set aside and your quarterly payment.
- LLC vs. S corp tax calculatorWhat an S corp election saves after payroll tax on your salary and the extra costs.
- Solo 401(k) & SEP IRA calculatorYour maximum 2026 contribution to each, side by side, for sole props and S corps.
Marketing
- ROAS calculatorReturn on ad spend, the break-even ROAS your margin needs, and profit after ads.
- CPM calculatorCost per thousand impressions, plus CTR, CPC and CPA from the same numbers.
- NPS calculatorYour Net Promoter Score, and how much of it is noise at your sample size.
- Engagement rate calculatorAverage engagement per post, by followers or by reach.
- LTV & CAC calculatorLifetime value, acquisition cost, LTV:CAC and the payback period.
Pricing and profit
Business templates
Every calculator runs entirely in your browser and shows its formula. They are for planning, not legal, tax or investment advice.