Free calculators for founders
Price a product, check your runway, forecast growth, set a freelance rate. Type your numbers, get the answer in seconds — free, no sign-up, nothing ever leaves your browser.
- 12 categories
- 320+ in-depth guides
- No sign-up & no data uploaded
- Open-source on GitHub
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Or see all 105 tools →Payments
Stripe, PayPal, Shopify fees and payout math
4 tools →SaaS Growth Metrics
MRR, ARR, growth rate, pricing and burn efficiency
15 tools →SaaS Retention Metrics
CAC, LTV, churn, retention and customer health
14 tools →Freelance
Rates, estimates and taxes for independent work
4 tools →Pricing & Margins
Margins, break-even, pricing and core arithmetic
16 tools →Marketing
ROAS, conversion, funnels, quota and campaign ROI
9 tools →Finance
Cash flow, ratios and core financial statements
14 tools →Cash Flow
Runway, working capital and how fast cash actually arrives
7 tools →Investment & Returns
NPV, IRR, payback and whether a spend earns its keep
7 tools →Valuation
DCF, multiples, enterprise value and fundraising math
7 tools →Tax & Compliance
Payroll tax, self-employment tax and filings
3 tools →HR & People
Headcount cost, turnover and compensation
5 tools →Recently added
View all →Churn Revenue Loss NEW
Forecast monthly and annual revenue lost to churn — and the MRR needed to break even.
2026-06-10ARR Growth Rate NEW
Calculate your Annual Recurring Revenue growth rate, T2D3 trajectory, and years to reach your ARR target.
2026-06-11SaaS Pricing NEW
Calculate optimal SaaS pricing tiers based on your costs, target margin, and willingness-to-pay — with monthly and annual plan analysis.
2026-06-12Why FounderCalc?
Generic utility tools compete against 10-year-old domains with millions of backlinks. FounderCalc focuses exclusively on the calculations that indie founders, bootstrapped SaaS builders, and freelancers actually need — the ones that involve real business math with real stakes.
Every calculator runs 100% in your browser. Nothing you type is ever sent to a server. No accounts. No tracking. No cookies beyond what your browser sets automatically. If you need a calculator that isn't here yet, let us know.