I Built 32 Free Business Calculators — No Signup, No Backend, Just Vanilla JS

Hi everyone! 👋

I’m a solo developer and I built BizCalcLab — a collection of 32+ free business calculators for small business owners and freelancers.

Why? I noticed most financial tools out there either require signup, collect data, or charge for basic features. I wanted something simpler.

What’s included:

• Tax calculators (SE tax, quarterly, S-Corp)
• Pricing calculators (profit margin, break-even)
• Payroll calculators (salary, freelance rate, employee cost)
• Loan & debt calculators
• Cash flow & valuation calculators

Tech: Just plain HTML, CSS, and JavaScript. No frameworks, no backend, no database. Everything runs in the browser.

Business model: Ad-supported, so it stays free for everyone.

Happy to answer any questions about the build, tech, or growing a free tool!

🔗 https://bizcalclab.com