Free SaaS & startup tools.
28 calculators and tools built to give you a real answer — not a marketing brochure. Numbered, opinionated, and free.
SaaS metrics.
The handful of numbers that decide whether a subscription business scales — MRR, churn, retention, unit economics.
- 01
MRR calculator
PopularMonthly Recurring Revenue, growth rate, and Quick Ratio for SaaS. - 02
Churn rate calculator
PopularCustomer churn, revenue churn, and Net Revenue Retention. - 03
LTV:CAC ratio calculator
PopularCustomer Lifetime Value vs. acquisition cost — the unit economics call. - 04
CAC calculator
Customer acquisition cost and payback period.
Financial.
Cash flow, profit, ROI. The numbers that separate businesses that survive from businesses that don't.
- 01
Burn rate calculator
Monthly burn, runway, and fundraising timeline recommendations. - 02
Runway calculator
When you run out of money — and how to extend the runway. - 03
Cash flow calculator
Operating cash flow, free cash flow, and liquidity health. - 04
Break-even calculator
When revenue covers costs — the line between losing and making money. - 05
Profit margin calculator
Gross, operating, and net margin with industry benchmarks. - 06
ROI calculator
PopularReturn on investment, annualized ROI, and multiples. - 07
Marketing ROI calculator
ROI, ROAS, CPL, CPA, payback — by campaign. - 08
SEO ROI calculator
PopularProject month-by-month SEO returns; compare to paid. - 09
Google Ads budget calculator
Estimate clicks, conversions, and ROAS for paid search. - 10
Consulting rate calculator
Set the right consulting rate based on costs and target margin. - 11
Freelance rate calculator
Hourly rate that covers expenses, taxes, and growth. - 12
Stripe fee calculator
PopularStripe fees per transaction, reverse, and monthly projection. - 13
Shopify fee calculator
PopularCompare every Shopify plan at your sales volume. - 14
Ecommerce profit calculator
Real margins after COGS, shipping, fees, returns, packaging. - 15
Startup valuation calculator
Pre-money valuation via the Scorecard Method.
Startup legal.
Equity splits, vesting, valuations, and conversion math. Cheap to model now, expensive to get wrong later.
- 01
Co-founder equity split
PopularDivide founder equity by contribution, commitment, capital, expertise. - 02
Vesting calculator
Vesting schedule with cliff periods and acceleration scenarios. - 03
Cap table calculator
Model dilution across multiple funding rounds. - 04
409A valuation calculator
Estimate common stock FMV before commissioning a formal 409A. - 05
SAFE calculator
Model how a SAFE converts at Series A — cap vs. discount. - 06
Convertible note calculator
Note conversion math — interest, discount, cap, ownership.
Hiring.
The real cost of bringing people on — what shows up in budgets, what hides in internal time.
Business tools.
Naming, keyword research, project budgeting. Tools for the early decisions where the cost of being wrong is highest.
Need a custom calculator or business tool?
I build custom web applications — calculators, internal dashboards, and business tools in Next.js. Whether it's a public-facing tool to drive leads or an internal app that replaces a brittle spreadsheet, let's talk.
Get in touchBuilt by Taro Schenker — full-stack developer who works with startups and local businesses.