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.

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

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 ...

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 ...