Math Calculators
Free math calculators for percentages, fractions, statistics and more.
Example: 350 total points across 4 credit classes → GPA: 3.50
Which Math Calculator Should You Use?
📊 Work with percentages
Use Percentage Calculator for 6 modes: find X% of Y, % change, difference, and more.
🧮 Solve fractions
Use Fraction Calculator for add, subtract, multiply, divide, simplify, and convert.
📈 Analyze data sets
Use Statistics Calculator for mean, median, mode, std dev, and outlier detection.
🎓 Track grades
Use Grade & GPA Calculator for weighted grades, GPA on 4.0/5.0 scales, and what-if analysis.
🔢 Solve equations
Use Equation Solver for linear and Quadratic Solver for ax²+bx+c=0.
🏷️ Calculate discounts & tips
Use Discount Calculator or Tip Calculator for everyday shopping and dining math.
Math Calculators at a Glance
Quick-reference comparison of math calculators and their use cases.
| Calculator | Best For | Key Modes |
|---|---|---|
| Percentage | Everyday percent math | 6 modes with visual bars |
| Fraction | Fraction operations | 6 modes with pie charts |
| Statistics | Data analysis | Descriptive stats, outliers, box plots |
| Grade & GPA | Academic tracking | Weighted, 4.0/5.0, what-if |
| Equation Solver | Linear equations | Step-by-step solutions |
| Quadratic Solver | Quadratic equations | Roots, discriminant, vertex |
| Pythagorean Theorem | Right triangles | Visual triangle display |
| Discount | Shopping savings | 4 modes + stacked discounts |
| Tip Calculator | Dining math | Bill splitting up to 20 people |
| Ratio | Proportions | 5 modes with visual bars |
| % Increase | Growth analysis | CAGR, multi-year, reverse |
| Date | Date math | Days between, add/subtract, age |
Popular Math Calculators
Percentage Calculator — 6 Modes
Our most popular math tool. Handles what is X% of Y, X is what % of Y, reverse percentage, % increase/decrease, % difference, and add/subtract %.
Fraction Calculator with Pie Charts
Add, subtract, multiply, divide, simplify, and compare fractions. Visual pie charts and step-by-step with LCD/GCD display.
Statistics Calculator with Outlier Detection
Full descriptive statistics suite. Includes frequency table, data generator, and outlier detection using IQR and Z-score methods.
All Math Calculators
Quick-reference table of every math calculator available on GM Calculator.
| Calculator | Best For | Link |
|---|---|---|
| 💯 Percentage Calculator | Calculate percentages, percentage increases, and percentage changes. | Use Tool → |
| ½ Fraction Calculator | Add, subtract, multiply, and divide fractions with step-by-step solutions. | Use Tool → |
| 🎓 Grade & GPA Calculator | Calculate grades and GPA from points, percentages, or letter grades. | Use Tool → |
| 📊 Statistics Calculator | Calculate mean, median, mode, standard deviation, and more. | Use Tool → |
| 📈 Percentage Increase Calculator | Calculate percentage increase between two values. | Use Tool → |
| ➗ Ratio Calculator | Simplify ratios and calculate missing ratio values. | Use Tool → |
| 💲 Tip Calculator | Calculate tip amounts and split bills among friends. | Use Tool → |
| 🏷️ Discount Calculator | Calculate sale prices and savings from percentage discounts. | Use Tool → |
| 📅 Date Calculator | Calculate days between dates, add or subtract days from a date. | Use Tool → |
| ✏️ Equation Solver | Solve linear equations with step-by-step solutions. | Use Tool → |
| 📐 Quadratic Equation Solver | Solve quadratic equations and find x-intercepts. | Use Tool → |
| △ Pythagorean Theorem Calculator | Calculate the sides of a right triangle using the Pythagorean theorem. | Use Tool → |
| 🔬 Scientific Notation Calculator | Convert numbers to and from scientific notation quickly. | Use Tool → |
Math Calculator FAQs
Everything you need to know about math calculations
How do you calculate percentage of a number?
To calculate a percentage of a number, multiply the number by the percentage divided by 100. For example, 20% of 150 is 150 × (20 ÷ 100) = 150 × 0.2 = 30. Use our Percentage Calculator for instant results on percentages, including percentage change and percentage of totals.
How do you calculate percentage increase?
Percentage increase is calculated as: ((new value - original value) ÷ original value) × 100. For example, if a value increases from 100 to 150: ((150 - 100) ÷ 100) × 100 = 50% increase. Our Percentage Increase Calculator also handles decreases and can calculate compound annual growth rate (CAGR) over multiple years.
How do you simplify fractions?
To simplify a fraction, divide both the numerator and denominator by their greatest common divisor (GCD). For example, 12/18 has a GCD of 6, so 12 ÷ 6 = 2 and 18 ÷ 6 = 3, making the simplified fraction 2/3. Our Fraction Calculator handles addition, subtraction, multiplication, division, and simplification instantly.
How is GPA calculated?
GPA (Grade Point Average) is calculated by converting each grade to a point value (A=4.0, B=3.0, etc.), multiplying by the course credits, summing these values, and dividing by total credits. Our Grade Calculator supports letter grades, percentages, GPA points, and custom grading scales — perfect for students tracking academic performance.
How do you calculate mean, median, and mode?
Mean is the average (sum ÷ count). Median is the middle value when sorted. Mode is the most frequent value. For the dataset 2, 3, 5, 5, 7: mean = 4.4, median = 5, mode = 5. Our Statistics Calculator computes all three plus standard deviation, variance, and range instantly.
How do you calculate discounts and sale prices?
To calculate the sale price after a discount: multiply the original price by (1 - discount percentage ÷ 100). For a $100 item at 25% off: $100 × 0.75 = $75. Our Discount Calculator also handles multiple discounts and displays total savings for better shopping decisions.
How do you split a bill with tip?
First, calculate the tip amount (bill × tip percentage). Add it to the bill, then divide by the number of people. For a $60 bill with 18% tip split among 3 people: tip = $10.80, total = $70.80, each pays $23.60. Our Tip Calculator handles percentage and fixed tips with any number of people.
From Our Blog
Explore math tutorials and practical application guides.
Reviewed by Emily Watson, M.Ed.
Mathematics EducatorMathematics teacher and curriculum designer with 15+ years of experience.