Grades & School
- Final Grade CalculatorWhat do you need on the final to hit your target grade?
- GPA CalculatorCollege GPA from letter grades and credit hours on the 4.0 scale.
- Grade CalculatorYour current course grade from assignment scores and weights, with the letter grade.
- High School GPA CalculatorWeighted and unweighted high school GPA, with Honors and AP/IB bumps applied.
- Weighted Grade CalculatorCombine homework, quiz, and exam category grades by syllabus weight.
Math
- Average CalculatorMean, median, sum, min, max, and range from any list of numbers.
- Fraction CalculatorAdd, subtract, multiply, or divide fractions — simplified automatically.
- Percentage CalculatorPercent of a number, percent-of, and percent change — one tool.
- Percentage Difference CalculatorThe symmetric % gap between two values — order doesn't matter.
- Quadratic Formula CalculatorSolve ax² + bx + c = 0 — real, repeated, or complex roots.
- Ratio CalculatorSimplify ratios to lowest terms or solve A:B = C:X proportions.
- Slope CalculatorSlope, y-intercept, and line equation from any two points.
- Velocity CalculatorSolve v = d/t for speed, distance, or time — any units.
Statistics
- Confidence Interval CalculatorConfidence interval and margin of error for a sample mean.
- Normal Distribution CalculatorBell curve probability — below, above, or between any values.
- P-Value CalculatorP-value from a z-score — two-tailed, left-tailed, or right-tailed.
- Standard Deviation CalculatorSample or population standard deviation from any list of numbers.
- Variance CalculatorSample or population variance, plus mean and standard deviation.
- Z-Score CalculatorHow many standard deviations from the mean — with percentile.
Finance & Money
- Compound Interest CalculatorWatch savings grow with contributions, year by year.
- Hourly to Salary CalculatorHourly to salary and back — with your real hours and weeks.
- Inflation CalculatorWhat your money will be worth — or cost — after inflation.
- Loan CalculatorMonthly payment, total interest, and a year-by-year payoff schedule.
- Mortgage CalculatorMonthly payment with taxes, insurance, and HOA — plus lifetime interest.
- Property Tax CalculatorAnnual and monthly property tax from assessed value and rate.
- Sales Tax CalculatorAdd tax to a price, or strip it back out of a total.