Online Calculator Tools

Free D-day calculator, age calculator, GPA calculator, and percent calculator. Get instant results in your browser.

4 tools

Calculate days remaining until a specific date or find the date after a certain number of days.

Enter your birth date to instantly find your age, zodiac sign, and constellation.

Calculate your GPA based on 4.5 or 4.3 scale. Goal GPA simulation available.

What is B% of A? What percent of B is A? Calculate percentages and rate of change easily.