Math & Calculators

Free Online Math & Calculators

Calculate percentages, ages, random numbers, and convert between number bases.

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About Math & Calculators

Free online math, finance, statistics, health calculators, and date/time tools. Our calculator collection includes a percentage calculator, discount calculator, tip calculator, sales tax calculator, loan calculator (EMI), mortgage calculator, compound interest calculator, simple interest calculator, BMI calculator, calorie calculator (BMR & TDEE), age calculator, date difference calculator, business day counter (excludes weekends and holidays), week number calculator (ISO 8601), time duration calculator, countdown timer for events and deadlines, GPA calculator, final grade calculator, salary calculator, fraction calculator, standard deviation calculator, ratio calculator, permutation & combination calculator, probability calculator, margin calculator, PayPal fee calculator, GST/VAT calculator, average calculator (mean, median, mode), and LaTeX math equation editor.

All Math & Calculators

LaTeX Math Equation Editor

Write LaTeX math equations with live preview. Insert symbols, fractions, integrals, matrices. Export as SVG.

Percentage Calculator

Calculate percentages instantly. Find X% of Y, what percent X is of Y, or percentage increase/decrease.

Random Number Generator

Generate secure random numbers within a range. Multiple numbers, unique mode, sorting, and statistics.

Age Calculator

Calculate exact age from a birthdate. Shows years, months, days, total days, hours, and next birthday.

Loan Calculator (EMI)

Calculate monthly loan payments, total interest, and total cost. See amortization breakdown.

BMI Calculator

Calculate Body Mass Index (BMI). Enter height and weight to see your BMI category and healthy range.

Tip Calculator

Calculate tip and split the bill. Set tip percentage and number of people for instant results.

Discount Calculator

Calculate the final price after a discount. Enter original price and discount percentage for savings.

Compound Interest Calculator

Calculate compound interest with custom compounding frequency. See growth over time.

Sales Tax Calculator

Calculate sales tax on purchases. Add tax to a price or reverse-calculate tax from a total.

Mortgage Calculator

Calculate monthly mortgage payments including principal, interest, property tax, and insurance.

Simple Interest Calculator

Calculate simple interest on a principal. Enter principal, rate, and time for instant results.

Date Difference Calculator

Calculate the difference between two dates. Shows days, weeks, months, and years.

GPA Calculator

Calculate your Grade Point Average (GPA) on a 4.0 scale. Add courses with credits and grades.

Salary Calculator

Convert between hourly, daily, weekly, monthly, and annual salary. See your full earnings breakdown.

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step simplification for proper and improper results.

Standard Deviation Calculator

Calculate standard deviation, variance, mean, median, mode, quartiles, and range for any data set.

Ratio Calculator

Simplify ratios, scale them to target values, and calculate aspect ratio, percentage splits, and decimal equivalents.

Permutation & Combination Calculator

Calculate permutations (nPr), combinations (nCr), and factorials for probability, statistics, and combinatorics.

Aspect Ratio Calculator

Calculate aspect ratios, simplify dimensions, and scale images or videos proportionally for any screen or project.

Average Calculator (Mean, Median, Mode)

Calculate mean, median, mode, and range for any set of numbers. Enter comma, space, or line-separated values.

Hours Calculator (Time Card)

Calculate work hours, overtime pay, and total compensation. Add clock-in/out entries for multiple days with hourly rate support.

Calorie Calculator (BMR & TDEE)

Calculate daily calorie needs, BMR, TDEE, and macronutrient split for weight loss, maintenance, or muscle gain.

Pomodoro Timer

Boost productivity with the Pomodoro technique. Work intervals, short/long breaks, desktop notifications, and weekly stats.

Margin Calculator

Calculate profit margin, markup percentage, and break-even point. Enter revenue and cost to see your margins instantly.

Salary to Hourly Converter

Convert between hourly, daily, weekly, monthly, and yearly salary. Based on standard 8-hour workdays, 5-day workweeks.

Percentage Change Calculator

Calculate percentage increase or decrease between two values with difference, change, and ratio.

World Clock

View current time across multiple timezones. Compare local times in 15+ major cities worldwide.

Probability Calculator

Calculate probabilities, odds, combinations, and permutations. For single or multiple events.

TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) and BMR. Find calories for maintenance, loss, or gain.

Bra Size Calculator

Calculate your bra size from underbust and bust measurements. US, UK, EU, FR, and AU sizes.

Ring Size Calculator

Convert ring sizes between US, UK, EU, and JP. Measure by circumference or diameter.

Online Ruler

Measure real-world objects using your screen. Calibrate with a credit card for accurate cm, inches, and pixel measurements.

PayPal Fee Calculator

Calculate PayPal fees for domestic and international transactions. See what you receive or what to charge.

GST / VAT Calculator

Add or remove GST/VAT from any amount. Supports 20+ countries with custom rate option.

Sort Numbers

Sort a list of numbers in ascending or descending order with optional duplicate removal and statistics.

Number Sequence Generator

Generate arithmetic, geometric, Fibonacci, prime, square, cube, triangular, or random number sequences.

Decimal to Fraction Converter

Convert any decimal number to its fraction form. Supports precision up to 1/1000 with simplified fractions.

Final Grade Calculator

Calculate the grade you need on your final exam to reach your target. Supports weighted assignments and shows best/worst-case scenarios.

Flashcards

Create and study digital flashcards. Add cards, flip to check answers, shuffle the deck, and track which cards you have mastered.

Business Day Counter

Calculate exact business days between two dates. Excludes weekends and optionally public holidays. Shows work weeks and ratios.

Week Number Calculator

Find the ISO week number, day of year, quarter, days remaining, and more for any date. Shows a monthly calendar.

Time Duration Calculator

Calculate the exact duration between two times. Shows hours, minutes, seconds, and decimal time — perfect for meetings and tasks.

Countdown Timer

Live countdown to any future date or event. Days, hours, minutes, and seconds updating in real-time with presets.

Common Use Cases

Perfect for shopping discounts, loan planning, investment tracking, fitness and health tracking, academic grading, statistical analysis, cooking measurements, business day counting for project deadlines, week number lookups for payroll, time duration tracking, and everyday math problems.

Frequently Asked Questions

Are these calculators accurate?

Yes. All calculators use standard mathematical formulas (Mifflin-St Jeor for BMR, amortization formula for loans, Black-Scholes-style formulas for finance). Results are accurate to the precision displayed.

Do I need to create an account to save my calculations?

No account needed. All calculators work instantly in your browser. You can copy results, take screenshots, or bookmark the page for future use.

Can I use these calculators for professional purposes?

Yes, the calculators are designed for professional use. The financial calculators use standard industry formulas, and the statistical calculators provide sample and population metrics suitable for academic and business analysis.

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