CalcWell

CalcWell is a free collection of fast, clean online calculators for the everyday math people search for most. No sign-up, no clutter, and no waiting: every calculator runs right in your browser, so results update as you type and your numbers never leave your device.

The first release includes 16 tools in four groups: everyday math (percentage, discount, tip and bill split, fraction), dates and time (age, date difference, add/subtract days, days-until countdown, time zone converter, hours/timesheet), school and stats (GPA, grade, mean/median/mode), and money and units (sales tax, simple and compound interest, unit converter).

Every tool page comes with a plain-English guide: the formula, worked examples, common mistakes and answers to frequently asked questions.

CalcWell is built to be fast. Pages load in well under a second on mobile, work offline after the first visit, and are fully keyboard- and screen-reader-friendly. The design is minimal on purpose: one input area, one clear answer, and a short explanation of how the answer was reached.

CalcWell is, and will stay, free. If there's a calculator you wish existed, use the contact page and tell us.