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Math 15
Grade Calculator
Find what score you need on your final exam, or calculate your current weighted grade.
Scientific Calculator
Free scientific calculator with trigonometry, logarithms, exponents, square roots, factorials, and DEG/RAD mode.
GPA Calculator
Calculate your semester or cumulative GPA by entering course grades and credit hours.
Calculator
A simple, reliable calculator for everyday math.
Percentage Calculator
Find percentages, calculate what percent one number is of another, or get percentage change.
Percentage Change Calculator
Calculate the percentage increase or decrease between any two values.
Average Calculator
Calculate mean, median, mode, min, max, and sum for any set of numbers.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Results shown as simplified fractions and decimals.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal. Type in any field to convert all.
Triangle Calculator
Calculate triangle area, perimeter, angles, and side lengths. Supports right triangles, Heron's formula, and the law of cosines.
LCM & GCF Calculator
Find the Least Common Multiple (LCM) and Greatest Common Factor (GCF) of two or more numbers instantly.
Quadratic Formula Calculator
Solve any quadratic equation ax² + bx + c = 0. Shows discriminant, both roots (real or complex), and step-by-step solution.
Probability Calculator
Calculate basic probability, combinations (nCr), and permutations (nPr) with step-by-step results.
Standard Deviation Calculator
Calculate mean, variance, and standard deviation (population and sample) for any dataset.
Ratio Calculator
Solve for a missing value in a proportion, simplify a ratio, or scale a ratio by any factor.
Finance 29
Tip Calculator
Calculate tips and split the bill evenly between multiple people.
Discount Calculator
Find the sale price after a discount or calculate what percentage discount was applied.
Tax Calculator
Add sales tax or VAT to a price, or reverse-calculate the pre-tax amount from a total.
Compound Interest Calculator
Calculate compound interest growth on any investment or savings over time.
Mortgage Calculator
Estimate your monthly mortgage payment including principal, interest, taxes, insurance, and PMI.
Amortization Calculator
Generate a full year-by-year amortization schedule showing principal, interest, and remaining balance.
Loan Calculator
Calculate your monthly payment, total paid, and total interest for any loan.
Paycheck Calculator
Estimate your take-home pay after federal income tax, Social Security, and Medicare.
Salary Calculator
Convert between hourly, daily, weekly, monthly, and annual salary figures.
Retirement Calculator
Project your 401(k) balance at retirement based on contributions, employer match, and expected return.
Debt Payoff Calculator
Find out how long it takes to pay off any debt and see the impact of extra monthly payments.
Savings Goal Calculator
Find out how many months it takes to reach a savings target with a set monthly contribution.
Investment Return Calculator
See how a lump sum and regular contributions grow with compound interest over any time horizon.
401(k) Calculator
Project your 401(k) balance at retirement based on salary, contribution rate, and employer match.
Car Lease Calculator
Estimate your monthly car lease payment from MSRP, residual value, money factor, and lease term.
Markup Calculator
Calculate markup percentage, profit margin, and profit from cost and selling price — or find any missing value.
Break-Even Calculator
Calculate your break-even point in units and revenue from fixed costs, variable costs, and selling price.
Inflation Calculator
Find the equivalent purchasing power of any dollar amount from 1913 to 2024 using US CPI data.
VAT Calculator
Add or remove VAT from any price. Supports any VAT rate with quick-select for UK, EU, Australia, and more.
Fuel Cost Calculator
Calculate the gas cost for any trip. Enter distance, fuel efficiency (MPG or L/100km), and gas price.
Net Worth Calculator
Add your assets and liabilities to instantly calculate your net worth and see your financial health at a glance.
Home Affordability Calculator
Find out how much house you can afford based on your income, debts, down payment, and interest rate using the 28/36 rule.
Rent vs. Buy Calculator
Compare the true financial cost of renting vs. buying over any time horizon, including equity, appreciation, and opportunity cost.
APY Calculator
Calculate Annual Percentage Yield from any interest rate and compounding frequency. Compare savings accounts accurately.
CD Calculator
Calculate your final balance, interest earned, and maturity date for any certificate of deposit.
Auto Loan Calculator
Calculate your monthly car payment, total interest, and total cost for any auto loan.
Student Loan Calculator
Calculate your monthly student loan payment and total interest over the life of the loan.
Credit Card Payoff Calculator
Find out when you'll be debt-free and how much interest you'll pay on any credit card balance.
Refinance Calculator
Compare your current mortgage with a new rate to find your monthly savings and break-even point.
Health 20
BMI Calculator
Calculate your Body Mass Index using height and weight in imperial or metric units.
Calorie Calculator
Calculate your daily calorie needs (TDEE) for weight loss, maintenance, or muscle gain.
Ovulation Calculator
Estimate your ovulation date, fertile window, and next period based on your cycle length.
TDEE Calculator
Find your Total Daily Energy Expenditure — the calories you burn per day based on your stats and activity level.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.
Ideal Weight Calculator
Find your ideal weight range by height and gender using four established formulas.
Body Fat Calculator
Estimate your body fat percentage using the US Navy tape-measure method.
Water Intake Calculator
Find your recommended daily water intake based on body weight and activity level.
Sleep Calculator
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles.
Due Date Calculator
Estimate your pregnancy due date, current week, and trimester from your last menstrual period.
Macro Calculator
Find your daily protein, carbohydrate, and fat targets in grams based on your calorie goal.
Pace Calculator
Calculate your running pace, finish time, or distance from any two values. Supports miles, kilometers, and common race distances.
Calorie Burn Calculator
Find how many calories you burn during any exercise based on activity, duration, and body weight.
Heart Rate Zone Calculator
Calculate your 5 heart rate training zones from your age and resting heart rate using the Karvonen formula.
Calorie Deficit Calculator
Find your daily calorie goal to lose weight at your chosen pace. Enter your TDEE and target weight for a personalized plan.
BAC Calculator
Estimate your blood alcohol content (BAC) from drinks, body weight, sex, and time using the Widmark formula.
Pregnancy Weight Gain Calculator
Find your recommended pregnancy weight gain range based on pre-pregnancy BMI using IOM guidelines. Track expected gain by week.
One Rep Max Calculator
Estimate your one-rep max (1RM) for any lift from weight and reps using multiple proven formulas.
Protein Calculator
Calculate your daily protein intake goal based on body weight, activity level, and fitness objective.
Dog Age Calculator
Convert your dog's age to human years based on breed size using the latest scientific research.
Date & Time 9
Age Calculator
Calculate exact age in years, months, and days from any date of birth.
Date Calculator
Find the number of days between two dates or add and subtract days from a date.
Hours Calculator
Calculate hours and minutes worked between two times, with optional break deduction.
Countdown Calculator
Find how many days, weeks, and months until any future date or since any past date.
Business Days Calculator
Count business days between two dates or find the date after adding business days.
UTC Clock & Timestamp
Live UTC clock with Unix timestamp in seconds and milliseconds. Covers major dev time zones.
Time Zone Converter
Convert any time between any two time zones with correct daylight saving time handling.
US Holiday Calendar
Exact dates for all US federal holidays for any year, past or future.
Chinese New Year & Zodiac
Find the Chinese New Year date, zodiac animal, and element for any year from 1960 to 2060.
Conversions 12
Currency Converter
Convert between 40+ world currencies with live exchange rates. Mid-market rates updated daily.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin instantly.
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.
Weight Converter
Convert between milligrams, grams, kilograms, ounces, pounds, stone, and metric tons.
Volume Converter
Convert between milliliters, teaspoons, tablespoons, cups, pints, quarts, liters, and gallons.
Speed Converter
Convert between miles per hour, kilometers per hour, meters per second, knots, and feet per second.
Data Storage Converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes, and petabytes.
Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years.
Area Converter
Convert between square feet, square meters, acres, hectares, square miles, and more. Edit any field to convert all others.
Word Counter
Count words, characters, sentences, paragraphs, and reading time instantly as you type or paste text.
Roman Numeral Converter
Convert numbers to Roman numerals or Roman numerals back to numbers instantly. Supports 1–3,999.
Color Converter
Convert colors between HEX, RGB, and HSL formats instantly. Includes a live color preview and one-click copy.
Generators 8
Password Generator
Generate strong, random passwords. Custom length, uppercase, lowercase, numbers, and symbols.
Random Number Generator
Generate random numbers in any range. Single or bulk results, with optional no-duplicates mode.
UUID Generator
Generate random UUID v4 identifiers for databases, APIs, and software development. One-click copy.
Coin Flipper
Flip a virtual coin and get heads or tails with true 50/50 randomness. Tracks session stats.
Dice Roller
Roll d4, d6, d8, d10, d12, d20, or d100 dice online. Roll up to 6 dice at once and see the total.
Decision Maker
Enter your options and get a random pick. Remove and re-roll to narrow down choices.
Love Calculator
Enter two names to get a fun compatibility score based on the classic FLAMES algorithm. Share the result with friends.
Zodiac Sign Calculator
Find your Western zodiac sign, element, ruling planet, and compatible signs from your birthday.
Home 9
Electricity Cost Calculator
Find out how much any appliance costs to run per day, month, or year based on wattage and your electricity rate.
Square Footage Calculator
Calculate square footage for rectangles, circles, triangles, and L-shapes. Add multiple rooms and convert to square meters.
Concrete Calculator
Calculate cubic yards of concrete and bags needed for slabs, columns, and footings.
Paint Calculator
Calculate how many gallons of paint you need for any room based on dimensions, doors, and windows.
Mulch Calculator
Calculate how many cubic yards or bags of mulch, gravel, or topsoil you need for any area and depth.
Fence Calculator
Calculate how many fence posts, panels, and rails you need. Supports rectangular yards, custom perimeters, and multiple gates.
Drywall Calculator
Calculate sheets of drywall, screws, and joint compound needed for any room based on dimensions, doors, and windows.
Flooring Calculator
Calculate square footage and boxes of flooring needed for any room. Supports multiple rooms and waste factor.
Tile Calculator
Calculate how many tiles and boxes you need for any floor or wall. Includes grout spacing and waste factor.