Math & Calculators
83 tools available
Calculate percentages, solve equations, convert units, and crunch numbers.
Percentage Calculator
Calculate percentages, percentage change, and what percent one number is of another.
Fraction Calculator
Add, subtract, multiply, and divide fractions with automatic simplification.
Scientific Calculator
Full-featured scientific calculator with trigonometry, logarithms, factorials, and more.
Matrix Calculator
Perform matrix operations: add, multiply, find determinant, inverse, and transpose for 2×2 and 3×3 matrices.
Quadratic Equation Solver
Solve quadratic equations (ax² + bx + c = 0) and find roots, discriminant, and vertex.
Exponent Calculator
Calculate x raised to the power of n (xⁿ) with scientific notation output.
Factorial Calculator
Calculate the factorial of any number (n!) with digit count and expansion.
GCD & LCM Calculator
Find the Greatest Common Divisor and Least Common Multiple of two or more numbers.
Prime Number Checker
Check if a number is prime and find its factors and nearest primes.
Prime Factorization
Find the prime factors of any number with expanded form and divisor count.
Fibonacci Calculator
Generate the Fibonacci sequence up to N terms with exact BigInt precision.
Standard Deviation Calculator
Calculate population or sample standard deviation, variance, mean, and range of a dataset.
Mean, Median & Mode Calculator
Calculate mean, median, mode, range, and other central tendency measures for any dataset.
Probability Calculator
Calculate simple probability, union, intersection, conditional probability, and complement.
Permutation Calculator (nPr)
Calculate the number of permutations (ordered arrangements) of n items taken r at a time.
Combination Calculator (nCr)
Calculate combinations (unordered selections) with or without repetition.
Binary Calculator
Perform binary arithmetic and bitwise operations (AND, OR, XOR, NOT).
Hexadecimal Calculator
Perform hexadecimal arithmetic and bitwise operations with multi-base output.
Octal Calculator
Perform octal (base-8) arithmetic with decimal, binary, and hex conversions.
Number Base Converter
Convert numbers between any bases from 2 to 36, including binary, octal, decimal, and hex.
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and view amortization schedule.
Loan EMI Calculator
Calculate Equated Monthly Installment (EMI) for any loan with year-by-year breakdown.
Compound Interest Calculator
Calculate compound interest with different frequencies and regular contributions.
Simple Interest Calculator
Calculate simple interest with flexible time period units (years, months, days).
ROI Calculator
Calculate return on investment (ROI) with optional annualized ROI for time-based comparison.
Break-Even Calculator
Calculate break-even point in units and revenue with profit/loss projections.
Profit Margin Calculator
Calculate gross margin, net margin, and markup percentage from revenue and costs.
Discount Calculator
Calculate discount amount and final price from percentage or fixed discounts.
Sales Tax Calculator
Calculate sales tax amount and total price, or extract tax from a tax-inclusive amount.
VAT Calculator
Calculate VAT inclusive/exclusive amounts with preset rates for popular countries.
Tip Calculator
Calculate tip amount and total with bill splitting for any number of people.
Bill Splitter
Split restaurant bills among multiple people with tax and tip included.
Currency Converter
Convert between 30+ world currencies with approximate exchange rates.
Salary Calculator
Convert salary between hourly, daily, weekly, bi-weekly, monthly, and annual rates.
Paycheck Calculator
Estimate take-home pay with federal tax, state tax, Social Security, and Medicare deductions.
Investment Return Calculator
Project future investment value with initial investment and regular monthly contributions.
Retirement Calculator
Project retirement savings and check if you're on track using the 4% rule.
Savings Goal Calculator
Calculate the monthly savings needed to reach a financial goal within a time frame.
Debt Payoff Calculator
Plan debt payoff with snowball vs avalanche strategies and extra payment analysis.
APR Calculator
Calculate the Annual Percentage Rate including fees and charges for true loan cost comparison.
BMI Calculator
Calculate your Body Mass Index based on height and weight with metric and imperial units.
BMR Calculator
Calculate your Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict equations.
TDEE Calculator
Calculate Total Daily Energy Expenditure based on BMR and activity level for weight management.
Calorie Calculator
Calculate daily calorie needs with macro breakdown for weight loss, maintenance, or muscle gain.
Body Fat Calculator
Estimate body fat percentage using the US Navy method with waist, neck, and hip measurements.
Ideal Weight Calculator
Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas plus BMI range.
Pace Calculator
Calculate running pace, finish time, or distance for training and race planning.
Speed Distance Time Calculator
Calculate speed, distance, or time given any two values with multiple unit conversions.
Blood Alcohol Calculator
Estimate Blood Alcohol Concentration (BAC) based on drinks, weight, sex, and time elapsed.
Pregnancy Due Date Calculator
Calculate estimated due date from last period, conception date, or IVF transfer with progress tracking.
Age Difference Calculator
Calculate the exact age difference between two people in years, months, days, weeks, and hours.
Dog Age Calculator
Convert dog years to human years using size-adjusted calculations based on AKC guidelines.
GPA Calculator
Calculate your GPA on a 4.0 scale with support for multiple courses, credits, and letter grades.
Grade Calculator
Calculate final grades from weighted scores or find the score needed on a final exam.
Weighted Average Calculator
Calculate weighted averages with dynamic data entry, showing both weighted and simple averages.
Sample Size Calculator
Calculate required sample size for surveys based on confidence level, margin of error, and population.
Confidence Interval Calculator
Calculate confidence intervals from summary statistics or raw data with multiple confidence levels.
Z-Score Calculator
Calculate Z-scores and percentiles, or find values from Z-scores using the standard normal distribution.
P-Value Calculator
Calculate p-values from Z or t test statistics with one-tailed and two-tailed options.
Chi-Square Calculator
Perform chi-square test of independence with contingency tables of any size.
Correlation Calculator
Calculate Pearson and Spearman correlation coefficients with R-squared interpretation.
Linear Regression Calculator
Perform linear regression to find the best-fit line equation with prediction capability.
Ohm's Law Calculator
Calculate voltage, current, resistance, or power using Ohm's Law and the power equation.
Resistor Color Code Calculator
Decode resistor values from color bands with visual selector for 4-band and 5-band resistors.
Voltage Divider Calculator
Calculate output voltage or required resistor value for voltage divider circuits.
Power Calculator (Electrical)
Calculate electrical power, voltage, current, or resistance using power equations.
Fuel Cost Calculator
Calculate fuel cost for any trip based on distance, fuel efficiency, and fuel price.
MPG / L/100km Calculator
Calculate fuel efficiency in MPG, L/100km, and km/L. Convert between fuel economy units.
Cooking Measurement Converter
Convert between cooking volume and weight measurements — teaspoons, cups, ounces, grams, and more.
Recipe Scaler
Scale recipe ingredients up or down by changing the number of servings with fraction display.
Aspect Ratio Calculator
Calculate aspect ratios from dimensions and resize images/videos while maintaining proportions.
PPI/DPI Calculator
Calculate pixel density (PPI/DPI) from screen resolution and physical size.
Screen Size Calculator
Calculate physical screen dimensions from diagonal size and aspect ratio, or diagonal from width and height.
Bandwidth Calculator
Convert between bandwidth and data rate units — bps, Kbps, Mbps, Gbps, MB/s, and more.
Download Time Calculator
Calculate how long a file download will take based on file size and connection speed.
Subnet Calculator
Calculate subnet details from IP address and CIDR prefix — network, broadcast, host range, and mask.
IP Range Calculator
Convert between IP address ranges and CIDR notation, showing total addresses and range details.
Roman Numeral Calculator
Convert between decimal numbers and Roman numerals (1–3999) with a reference chart.
Scientific Notation Converter
Convert between decimal and scientific notation, with E-notation display and arithmetic operations.
Logarithm Calculator
Calculate logarithms in any base (natural log, log₁₀, log₂, custom) and antilogarithms.
Trigonometry Calculator
Calculate all six trig functions (sin, cos, tan, csc, sec, cot) and inverse trig functions.
Area Calculator
Calculate area and perimeter for 8 shapes — rectangle, circle, triangle, trapezoid, and more.
Volume Calculator
Calculate volume and surface area of 8 3D shapes — cube, sphere, cylinder, cone, and more.
About Math & Calculators
Our math & calculators collection offers a comprehensive suite of browser-based utilities designed to handle everyday tasks without any software installation. Every tool processes your data entirely on your device — nothing is uploaded to a server, keeping your files completely private.
Whether you're a professional needing quick conversions, a student working on assignments, or anyone who values privacy, these 83+ free tools are ready to use instantly. No signup, no downloads, no limits.
Common Use Cases
- ✓Quick file processing without installing software
- ✓Privacy-sensitive work that can't be uploaded to cloud services
- ✓Batch operations on multiple files at once
- ✓Cross-format conversions for compatibility
- ✓On-the-go editing from any device with a browser
Frequently Asked Questions
Are these math & calculators really free?
Yes, every tool is 100% free with no hidden fees, no premium tiers, and no usage limits.
Is my data safe when using these tools?
Absolutely. All processing happens directly in your browser. Your files are never uploaded to any server.
Do I need to create an account?
No. Every tool works instantly without any signup or registration.
Can I use these tools on mobile?
Yes! All tools are fully responsive and work on phones, tablets, and desktops.
What browsers are supported?
Our tools work on all modern browsers including Chrome, Firefox, Safari, and Edge.