Math & Calculators

Percentage Calculator

Calculate percentages, percentage change, and what percent one number is of another.

🔢 Math & Calculators

Fraction Calculator

Add, subtract, multiply, and divide fractions with automatic simplification.

🔢 Math & Calculators

Scientific Calculator

Full-featured scientific calculator with trigonometry, logarithms, factorials, and more.

🔢 Math & Calculators

Matrix Calculator

Perform matrix operations: add, multiply, find determinant, inverse, and transpose for 2×2 and 3×3 matrices.

🔢 Math & Calculators

Quadratic Equation Solver

Solve quadratic equations (ax² + bx + c = 0) and find roots, discriminant, and vertex.

🔢 Math & Calculators

Exponent Calculator

Calculate x raised to the power of n (xⁿ) with scientific notation output.

🔢 Math & Calculators

Factorial Calculator

Calculate the factorial of any number (n!) with digit count and expansion.

🔢 Math & Calculators

GCD & LCM Calculator

Find the Greatest Common Divisor and Least Common Multiple of two or more numbers.

🔢 Math & Calculators

Prime Number Checker

Check if a number is prime and find its factors and nearest primes.

🔢 Math & Calculators

Prime Factorization

Find the prime factors of any number with expanded form and divisor count.

🔢 Math & Calculators

Fibonacci Calculator

Generate the Fibonacci sequence up to N terms with exact BigInt precision.

🔢 Math & Calculators

Standard Deviation Calculator

Calculate population or sample standard deviation, variance, mean, and range of a dataset.

🔢 Math & Calculators

Mean, Median & Mode Calculator

Calculate mean, median, mode, range, and other central tendency measures for any dataset.

🔢 Math & Calculators

Probability Calculator

Calculate simple probability, union, intersection, conditional probability, and complement.

🔢 Math & Calculators

Permutation Calculator (nPr)

Calculate the number of permutations (ordered arrangements) of n items taken r at a time.

🔢 Math & Calculators

Combination Calculator (nCr)

Calculate combinations (unordered selections) with or without repetition.

🔢 Math & Calculators

Binary Calculator

Perform binary arithmetic and bitwise operations (AND, OR, XOR, NOT).

🔢 Math & Calculators

Hexadecimal Calculator

Perform hexadecimal arithmetic and bitwise operations with multi-base output.

🔢 Math & Calculators

Octal Calculator

Perform octal (base-8) arithmetic with decimal, binary, and hex conversions.

🔢 Math & Calculators

Number Base Converter

Convert numbers between any bases from 2 to 36, including binary, octal, decimal, and hex.

🔢 Math & Calculators

Mortgage Calculator

Calculate monthly mortgage payments, total interest, and view amortization schedule.

🔢 Math & Calculators

Loan EMI Calculator

Calculate Equated Monthly Installment (EMI) for any loan with year-by-year breakdown.

🔢 Math & Calculators

Compound Interest Calculator

Calculate compound interest with different frequencies and regular contributions.

🔢 Math & Calculators

Simple Interest Calculator

Calculate simple interest with flexible time period units (years, months, days).

🔢 Math & Calculators

ROI Calculator

Calculate return on investment (ROI) with optional annualized ROI for time-based comparison.

🔢 Math & Calculators

Break-Even Calculator

Calculate break-even point in units and revenue with profit/loss projections.

🔢 Math & Calculators

Profit Margin Calculator

Calculate gross margin, net margin, and markup percentage from revenue and costs.

🔢 Math & Calculators

Discount Calculator

Calculate discount amount and final price from percentage or fixed discounts.

🔢 Math & Calculators

Sales Tax Calculator

Calculate sales tax amount and total price, or extract tax from a tax-inclusive amount.

🔢 Math & Calculators

VAT Calculator

Calculate VAT inclusive/exclusive amounts with preset rates for popular countries.

🔢 Math & Calculators

Tip Calculator

Calculate tip amount and total with bill splitting for any number of people.

🔢 Math & Calculators

Bill Splitter

Split restaurant bills among multiple people with tax and tip included.

🔢 Math & Calculators

Currency Converter

Convert between 30+ world currencies with approximate exchange rates.

🔢 Math & Calculators

Salary Calculator

Convert salary between hourly, daily, weekly, bi-weekly, monthly, and annual rates.

🔢 Math & Calculators

Paycheck Calculator

Estimate take-home pay with federal tax, state tax, Social Security, and Medicare deductions.

🔢 Math & Calculators

Investment Return Calculator

Project future investment value with initial investment and regular monthly contributions.

🔢 Math & Calculators

Retirement Calculator

Project retirement savings and check if you're on track using the 4% rule.

🔢 Math & Calculators

Savings Goal Calculator

Calculate the monthly savings needed to reach a financial goal within a time frame.

🔢 Math & Calculators

Debt Payoff Calculator

Plan debt payoff with snowball vs avalanche strategies and extra payment analysis.

🔢 Math & Calculators

APR Calculator

Calculate the Annual Percentage Rate including fees and charges for true loan cost comparison.

🔢 Math & Calculators

BMI Calculator

Calculate your Body Mass Index based on height and weight with metric and imperial units.

🔢 Math & Calculators

BMR Calculator

Calculate your Basal Metabolic Rate using Mifflin-St Jeor and Harris-Benedict equations.

🔢 Math & Calculators

TDEE Calculator

Calculate Total Daily Energy Expenditure based on BMR and activity level for weight management.

🔢 Math & Calculators

Calorie Calculator

Calculate daily calorie needs with macro breakdown for weight loss, maintenance, or muscle gain.

🔢 Math & Calculators

Body Fat Calculator

Estimate body fat percentage using the US Navy method with waist, neck, and hip measurements.

🔢 Math & Calculators

Ideal Weight Calculator

Calculate ideal body weight using Robinson, Miller, Devine, and Hamwi formulas plus BMI range.

🔢 Math & Calculators

Pace Calculator

Calculate running pace, finish time, or distance for training and race planning.

🔢 Math & Calculators

Blood Alcohol Calculator

Estimate Blood Alcohol Concentration (BAC) based on drinks, weight, sex, and time elapsed.

🔢 Math & Calculators

Pregnancy Due Date Calculator

Calculate estimated due date from last period, conception date, or IVF transfer with progress tracking.

🔢 Math & Calculators

Age Difference Calculator

Calculate the exact age difference between two people in years, months, days, weeks, and hours.

🔢 Math & Calculators

Dog Age Calculator

Convert dog years to human years using size-adjusted calculations based on AKC guidelines.

🔢 Math & Calculators

GPA Calculator

Calculate your GPA on a 4.0 scale with support for multiple courses, credits, and letter grades.

🔢 Math & Calculators

Grade Calculator

Calculate final grades from weighted scores or find the score needed on a final exam.

🔢 Math & Calculators

Weighted Average Calculator

Calculate weighted averages with dynamic data entry, showing both weighted and simple averages.

🔢 Math & Calculators

Sample Size Calculator

Calculate required sample size for surveys based on confidence level, margin of error, and population.

🔢 Math & Calculators

Confidence Interval Calculator

Calculate confidence intervals from summary statistics or raw data with multiple confidence levels.

🔢 Math & Calculators

Z-Score Calculator

Calculate Z-scores and percentiles, or find values from Z-scores using the standard normal distribution.

🔢 Math & Calculators

P-Value Calculator

Calculate p-values from Z or t test statistics with one-tailed and two-tailed options.

🔢 Math & Calculators

Correlation Calculator

Calculate Pearson and Spearman correlation coefficients with R-squared interpretation.

🔢 Math & Calculators

Linear Regression Calculator

Perform linear regression to find the best-fit line equation with prediction capability.

🔢 Math & Calculators

Ohm's Law Calculator

Calculate voltage, current, resistance, or power using Ohm's Law and the power equation.

🔢 Math & Calculators

Resistor Color Code Calculator

Decode resistor values from color bands with visual selector for 4-band and 5-band resistors.

🔢 Math & Calculators

Voltage Divider Calculator

Calculate output voltage or required resistor value for voltage divider circuits.

🔢 Math & Calculators

Fuel Cost Calculator

Calculate fuel cost for any trip based on distance, fuel efficiency, and fuel price.

🔢 Math & Calculators

Cooking Measurement Converter

Convert between cooking volume and weight measurements — teaspoons, cups, ounces, grams, and more.

🔢 Math & Calculators

Recipe Scaler

Scale recipe ingredients up or down by changing the number of servings with fraction display.

🔢 Math & Calculators

Aspect Ratio Calculator

Calculate aspect ratios from dimensions and resize images/videos while maintaining proportions.

🔢 Math & Calculators

PPI/DPI Calculator

Calculate pixel density (PPI/DPI) from screen resolution and physical size.

🔢 Math & Calculators

Screen Size Calculator

Calculate physical screen dimensions from diagonal size and aspect ratio, or diagonal from width and height.

🔢 Math & Calculators

Bandwidth Calculator

Convert between bandwidth and data rate units — bps, Kbps, Mbps, Gbps, MB/s, and more.

🔢 Math & Calculators

Download Time Calculator

Calculate how long a file download will take based on file size and connection speed.

🔢 Math & Calculators

Subnet Calculator

Calculate subnet details from IP address and CIDR prefix — network, broadcast, host range, and mask.

🔢 Math & Calculators

IP Range Calculator

Convert between IP address ranges and CIDR notation, showing total addresses and range details.

🔢 Math & Calculators

Roman Numeral Calculator

Convert between decimal numbers and Roman numerals (1–3999) with a reference chart.

🔢 Math & Calculators

Scientific Notation Converter

Convert between decimal and scientific notation, with E-notation display and arithmetic operations.

🔢 Math & Calculators

Logarithm Calculator

Calculate logarithms in any base (natural log, log₁₀, log₂, custom) and antilogarithms.

🔢 Math & Calculators

Trigonometry Calculator

Calculate all six trig functions (sin, cos, tan, csc, sec, cot) and inverse trig functions.

🔢 Math & Calculators

Area Calculator

Calculate area and perimeter for 8 shapes — rectangle, circle, triangle, trapezoid, and more.

🔢 Math & Calculators