Calculators worth bookmarking
Tools that solve real problems. Clear math, zero fluff, built for humans.
3
Calculators
100%
Client-side
0
Ads or trackers
∞
Free forever
See exactly how money grows over time with year-by-year breakdowns, a visual chart, and quick rate presets for HYSA vs. index fund averages.
Calculate your true minimum hourly or project rate after taxes, benefits, overhead, vacation, and non-billable overhead. No more underselling.
Estimate your monthly Workers, KV, D1, R2, and Durable Objects bill based on real usage — before you scale. Compares Free vs. Standard tier.
No calculators match that search yet. Request one.
Built for real problems
Every calculator here starts from a genuine question — something with a non-obvious answer that requires actual math. We build it once, build it well, and keep it free.
Some pages carry affiliate links or recommendations for products we'd use ourselves. These are always clearly disclosed. They help keep the lights on without ads or data collection.