Track and celebrate birthdays, anniversaries, and milestones with our Milestone & Anniversary Calculator. Plan your next special day easily.

Instantly calculate weighted and final grades with our Smart Grade Calculator. Simple, accurate, and perfect for students and teachers.

Business Day Calculator Find working days between dates Start Date End Date Holidays to Exclude (YYYY-MM-DD, one per line) Add US Federal Holidays (for ...

Find what week of the year a date falls on with our free Week Number Calculator. Fast, accurate, and ideal for planning or scheduling.

Split bills, choose tip %, exclude tax, and round totals. Accurate per-person amounts in real time. To calculate a tip, figure your bill amount, choose a tip percentage, and divide the result among ...

Our free online math calculator lets you perform both basic and scientific calculations directly in your browser — no app or download needed. It’s perfect for students, teachers, and professionals who ...

El Salvador does not observe Daylight Saving Time. The country remains on UTC − 6 year-round, which simplifies scheduling for travel, business, and communication. DST was experimented with in the ...

Keyboard: Space to start/pause • E edit • S stop • R reset ...

Keyboard: Space to start/pause • E edit • S stop • R reset Start to begin. Stop to pause, then Start to resume. Reset returns to 15:00. Edit lets you pick a sound, change volume, loop the alarm, or ...