5 min read
2026-02-05
Stacked discounts are tricky. Know your real savings:
Price: 5000, 30% off then another 10% off
Total: 5000 × 0.7 × 0.9 = 3150 (37% off total, not 40%)
Monthly payment estimates
Comparing effective interest rates
Total interest over the life of a loan
| Situation | Formula |
|---|---|
| 13% income tax (example) | Salary × 0.13 |
| Net after tax | Salary × 0.87 |
| 15% raise | Salary × 1.15 |
Body fat percentage
Macro ratios (protein, fat, carbs)
Weight change in percent
Website conversion (visitors → buyers)
Product margin
Sales growth vs the previous period
Bookmark a percentage calculator — you will use it more than you expect.
See also: Discount Calculator, Tax Calculator