How I built a free PTO optimizer that turns 5 days off into 18 — and the algorithm behind it

Most people treat PTO like a currency they spend one day at a time. What if you could treat it like a lever? Here's the insight that sparked this project: the same Thursday off can be worth completely different amounts of actual time away from work , depending entirely on where it falls in the calendar. Take a random Thursday in February: you get one day off. Nice. Take Thursday, November 26, 2026 — Thanksgiving. Now that Thursday comes pre-loaded with a Friday (most employers give it), Saturday, and Sunday. Suddenly you're looking at a 4-day break for zero PTO spent. But if you also take Monday through Wednesday before it, you've spent 3 PTO days and earned 9 consecutive days off. That's a 3x multiplier. I got obsessed with this math. So I built Holiday Optimizer — a free tool that finds every one of these opportunities for your country and year, then figures out the optimal combination given your PTO budget. The Algorithm The core idea is simple: public holidays and weekends create "