I built WorkCalc: A zero-dependency financial calculator suite for freelancers

Yuji — Wed, 09 Sep 2026 15:04:55 +0000

Hey developers! 👋

Like many freelancers and independent consultants, I got tired of bloated financial tools that:

So I decided to build WorkCalc — a fast, private, and 100% client-side financial calculator suite.

Hourly Rate Calculator: Factors in business overhead, vacation weeks, taxes, and most importantly — unbillable admin time (realistic billable capacity).
Project Pricing Calculator: Converts raw delivery hours into fixed quotes with contingency buffers for revision creep and payment platform fees.
Profit Margin & Markup: Compares Gross Margin, Net Margin, and cost Markup side-by-side to avoid cash-flow traps.
Break-Even Point: Classical CVP analysis calculating unit contribution margin and safety cushion.
Sales Commission Calculator: Handles variable rates, flat processing cuts, and multi-partner splits.

I intentionally challenged myself to avoid frameworks:

HTML5: Semantic, accessible markup.
CSS3: Responsive, mobile-first design system with CSS custom properties.
Vanilla JavaScript: Pure mathematical functions, defensive parsing (no NaN or Infinity), and reactive client-side recalculation.
Hosting: Free GitHub Pages.

No backend, no database, no external dependencies. All calculations run strictly in the user's browser memory.

I would love to get your feedback on the UX and calculation logic. What other financial tools should I add next?

DEV Community: Yuji