Free Calculators for Students & Teachers
No login, no ads in the way, works on phones and Chromebooks. Bookmark the ones you use most — they're always free.
GPA Calculator
Unweighted and weighted GPA with AP/Honors/IB levels.
GPA Planner
Plan future semesters and see how they affect your cumulative GPA.
Grade & Final Exam Calculator
Convert scores to letters, or find out what you need on the final.
SAT Score Planner
Check your percentile, plan study time, and see which school tiers you reach.
Percentage Calculator
Quick percentage math for grades and assignments.
Fraction Calculator
Add, subtract, multiply, and divide fractions.
Scientific Calculator
Full scientific calculator for math and science classes.
Statistics Calculator
Mean, median, mode, standard deviation, and more.
Pythagorean Theorem
Solve for any side of a right triangle.
Quadratic Formula
Solve ax² + bx + c = 0 with step-by-step results.
For teachers
All Numbarn calculators are free for classroom use. Students can access them on any device without creating accounts. Formulas are shown and explained on every page, making them useful for teaching concepts, not just getting answers. Link directly to specific calculators from your LMS or class website.