Free Math Tools — Statistics, Compound Interest & Grade Calculator
Compute descriptive statistics, project compound interest growth, calculate investment ROI, find weighted grade averages and GPA, work out percentages, and perform advanced scientific calculations — all free, accurate, and in-browser.
All Math Tools
Statistics Calculator
Calculate mean, median, mode, standard deviation, and more.
MathMatrix Calculator
Add, subtract, multiply matrices and compute transpose and determinant.
MathEquation Solver
Solve linear, quadratic, and cubic equations step by step.
MathPrime Factorization
Find the prime factors of any number and compute GCD and LCM.
MathDecision Matrix
Evaluate options against weighted criteria to make better decisions.
MathAbout Math Tools
Mathematics underpins every quantitative decision, and our math tools give you fast, accurate answers without needing a graphing calculator, spreadsheet, or specialist software. Every tool runs in your browser with zero data transmission.
The Statistics Calculator accepts a comma-separated list of numbers and instantly computes the mean, median, mode, range, variance, population standard deviation, sample standard deviation, minimum, maximum, and sum. It's ideal for students, data analysts, and anyone working with numerical datasets.
The Compound Interest Calculator visualises investment growth using the A = P(1 + r/n)^(nt) formula, with configurable compounding frequency. The Investment Return Calculator computes total return, ROI percentage, and annualised (CAGR) return for any investment, supporting both simple and compound growth models.
The Grade / GPA Calculator supports weighted assignments — add each task with its score and weight, and the calculator determines your overall grade percentage and GPA on the standard 4.0 scale. The Percentage Calculator handles three common calculations: find X% of a number, calculate what percentage one number is of another, and compute percentage increase or decrease.
The Scientific Calculator provides sin, cos, tan, log, natural log, square root, exponentiation, and factorial functions with full calculation history and support for both degree and radian modes.
Frequently Asked Questions
What statistical measures does the Statistics Calculator compute?
The Statistics Calculator computes mean, median, mode, range, minimum, maximum, sum, count, population variance, sample variance, population standard deviation, and sample standard deviation.
Is the compound interest formula standard?
Yes. The formula used is A = P(1 + r/n)^(nt), where P is principal, r is annual interest rate, n is compounding frequency per year, and t is time in years. This is the internationally standard compound interest formula.
How is GPA calculated in the Grade Calculator?
The Grade Calculator converts your weighted percentage score to a GPA on the 4.0 scale using the standard US grading rubric: A (90–100%) = 4.0, B (80–89%) = 3.0, C (70–79%) = 2.0, D (60–69%) = 1.0, F (<60%) = 0.0.
What formula does the Investment Return Calculator use?
For total return it uses (Final Value − Initial Investment) / Initial Investment × 100. For annualised return (CAGR), it uses (Final / Initial)^(1/years) − 1 × 100, which is the standard compound annual growth rate formula.
Can I export or save my calculation results?
You can copy results to the clipboard from any tool, or use your browser's Print function (Ctrl+P / Cmd+P) to save a PDF of your results. Persistent save functionality is on our roadmap.