Free Online Calculators
& Tools

Calculate compound interest growth over time

Monthly payments and total loan cost

Estimate your monthly mortgage payment

Return on investment analysis

Convert hourly, daily, monthly wages

Find percentages, values, and totals

Calculate % increase or decrease

Split bills and calculate tips

Find sale prices and savings

Calculate profit margins and markups

Body Mass Index for adults and children

Daily calorie needs by activity level

Calculate exact age from birthdate

Estimate body fat percentage

Find your ideal body weight range

Powers, roots, logs, and trig functions

Simple everyday arithmetic — add, subtract, multiply, divide

Mean, median, mode and range from a list

Add, subtract, multiply and divide fractions

Solve ax² + bx + c = 0 with full results

Check if a number is prime and find factors

Days, weeks, months between two dates

Count down to any future date or event

Calculate business days between two dates

Convert time between world time zones

Convert seconds, minutes, hours, days, weeks

Meters, feet, inches, km, miles and more

kg, lbs, oz, grams, stone conversions

Celsius, Fahrenheit, and Kelvin

Convert between major world currencies

KB, MB, GB, TB, PB conversions

Interactive periodic table — click any element to view atomic number, mass, protons, neutrons, and more

Find the missing side of a right triangle using a² + b² = c²

Find slope, y-intercept, line equation, midpoint, and distance between two points

Convert any decimal, fraction, or percentage instantly to all three forms in one step

Calculate area of circle, rectangle, triangle, trapezoid, parallelogram, ellipse, or sector

Generate multiplication tables for any number

Find the missing number in a sequence or equation

Identify and extend number patterns

Break numbers into ones, tens, hundreds, thousands

Simplify any fraction to its lowest terms

Generate random nouns, verbs, adjectives or any word — great for writing prompts, games & creativity

Enter random letters and find all valid words you can make — perfect for Scrabble & word games

Count words, characters, sentences, and paragraphs

Count how often each letter appears in any text

Count vowels and consonants in any word or sentence

Check if a word or phrase reads the same backwards

Check if two words or phrases are anagrams of each other

Calculate the Scrabble point value of any word

Filter possible Wordle answers with green/yellow/grey clues

Interactive countdown timer for events, workouts, and deadlines

Calculate cumulative GPA from grades and credit hours

Plan your budget using the 50/30/20 rule

Convert text to stylish Unicode fonts for social media

Generate random character names and baby names

Estimate your net take-home pay after federal tax, FICA, and state deductions

Convert between cups, tablespoons, teaspoons, fluid ounces, milliliters and more

Estimate how many gallons of paint you need for your walls

Convert your dog's age into human years based on size

Compare two tire sizes and see how a size change affects your speedometer

Calculate concrete volume for slabs, walls, footings, or round columns

Determinant, transpose, inverse, and matrix add, subtract or multiply

Solve Ohm's Law and power from any two of voltage, current, resistance, or power

Calculate depth of field from focal length, aperture, distance, and sensor size

Convert oven recipes to air fryer temperature and time

Estimate your annual carbon emissions from driving, flights, home energy, and diet

Plan your trip expenses by category and see your total and daily cost

Roll polyhedral dice (d4 to d100) with a modifier for tabletop RPGs

Calculate daily protein, carbs, and fat targets from your calorie goal and diet preset

Calculate commission and total earnings from sales, rate, base salary, and bonus

Generate a strong random password with custom length and character types

Calculate how much mulch you need in cubic feet, yards, and 2-cu-ft bags

Estimate roof area, squares, and asphalt shingle bundles from dimensions and pitch

Convert your cat's age into human years and find its life stage

Size your emergency fund and see how long it takes to save it

Compare the total cost of renting vs buying a home

Monthly auto loan payment with trade-in, down payment, and tax

What a meeting really costs your team per meeting and per year

Hours worked from clock-in/out minus breaks, with overtime pay