A small, static GitHub Pages site that bundles a few practical calculators I use in real-world freelancing / B2B conversations.

• Hourly Rate Calculator (tools/hourly-rate/)

  • Derives an hourly (or day) rate from annual cost structure, unproductive days, and a configurable tax model.
  • Includes JSON presets + import/export.

• Retainer Tier Evaluator (tools/retainer-tier/)

  • Compares retainer tiers by MRR/ARR, effective rate, reserved capacity, and contract knobs (discount, overage, notice, term).

• Replacement Cost Calculator (tools/replacement-cost/)

  • Estimates the replacement premium (Δ vs baseline) based on ramp-up productivity, mentoring overhead, procurement hours, and optional cost-of-delay.
  • Includes JSON presets + import/export.

No build step. Any static server works.

python3 -m http.server 8080
# open http://localhost:8080

These tools are for modeling and decision support. They are not tax/legal advice and they may use simplified assumptions.

1. Create a new folder under tools/<your-tool>/.
2. Add a tool.json file inside that folder (required keys: title, description; optional: tags, order).
3. Run make tools-json to regenerate tools.json.
4. Commit your changes.

On GitHub, a workflow regenerates tools.json on pushes to main (and verifies it on pull requests).