All Free Online 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

Project future savings growth

Adjust amounts for inflation over time

Estimate income tax liability

Find the point where revenue covers costs

Calculate your total assets minus liabilities

Calculate profit/loss and return on stock trades

See when you'll be debt-free and total interest paid

Find percentages, values, and totals

Calculate % increase or decrease

Split bills and calculate tips

Find sale prices and savings

Calculate total cost with sales tax

Calculate profit margins and markups

Add or remove GST/VAT from any price

Simplify ratios and find equivalent ratios

Calculate your weighted course grade

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

Calculate expected due date

Daily water intake recommendation by weight

Find target heart rate zones for training

Convert steps to kilometres or miles walked

Find the best time to wake up based on sleep cycles

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

Greatest Common Divisor and Least Common Multiple

Calculate powers, roots, and scientific notation

Generate random numbers within any range

Binary, Octal, Decimal, Hexadecimal conversions

Population & sample standard deviation

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

Convert Unix timestamps to readable dates

Add or subtract days from any date

Find the ISO week number for any date

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

Convert HEX, RGB, and HSL color formats

mph, km/h, knots, m/s conversions

Convert m², ft², acres, hectares and more

Liters, gallons, cups, fl oz conversions

Joules, calories, kWh, BTU conversions

Pascal, bar, PSI, atm conversions

MPG, L/100km, km/L conversions

Degrees, radians, gradians conversions

Watts, horsepower, BTU/hr conversions

Calculate simple interest on a principal amount

See how long to pay off your credit card balance

Project your retirement savings at any target date with monthly contributions

Monthly payment plus year-by-year principal and interest breakdown

Basal Metabolic Rate — calories your body burns at rest

Total Daily Energy Expenditure based on activity level

Enter distance and finish time to calculate your running pace and speed

Daily protein intake recommendation by goal and weight

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

Calculate nPr permutations and nCr combinations — how many ways to arrange or choose r from n

Round any number to N significant figures and understand sig fig counting rules

Convert to/from scientific notation and multiply, divide, or add in scientific notation

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

Find radius, diameter, circumference, or area from any one known circle value

Calculate event probability, P(A and B), P(A or B), and complement probability

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

Calculate volume of sphere, cube, cylinder, cone, rectangular prism, or pyramid

Solve any triangle from 3 known sides/angles using the Law of Sines and Law of Cosines

Area, perimeter, angles, and sides of any triangle

Calculate percent error between estimated and actual values

Arithmetic and geometric sequence solver

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

Step-by-step long division with full working shown

Convert between Roman numerals and standard numbers

Check multiplication answers and see step-by-step work

Round numbers to nearest 10, 100, decimal place

Check if numbers are even or odd with explanations

Convert 1st, 2nd, 3rd — ordinal number names

Practice addition, subtraction, multiplication, division

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

Calculate how long your speech will take based on word count and speaking speed

Find words that start with, end with, or contain specific letters

Generate a word search puzzle from your own word list

Count syllables in any word or sentence

Find the position of each letter in the alphabet (A=1)

Reverse any word, sentence, or paragraph instantly

Analyse sentence length, reading time, and complexity

Translate English text into Pig Latin

Translate text to and from Morse code

Convert text between UPPERCASE, lowercase, and more

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

Convert word count to pages based on formatting

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

Calculate selling price and profit from a target profit margin

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

A fun estimator for the likelihood of a school snow day

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

Estimate pickets, posts, rails, and concrete to build a fence

Convert oven recipes to air fryer temperature and time

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

Calculate a confidence interval for a population mean or proportion

Convert lumens to watts for LED, CFL, and incandescent bulbs

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

See how much you can safely withdraw each year from your retirement savings

Estimate your ovulation date and fertile window for family planning

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

Convert shoe size between US men/women, UK, and EU

Convert any number into its English word form for checks and invoices

Generate a strong random password with custom length and character types

Generate Lorem Ipsum placeholder text for design mockups and wireframes

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

Split total rent and utilities evenly among any number of roommates

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

Down payment, loan amount, and monthly mortgage payment

Compare the total cost of renting vs buying a home

Hourly and day rate needed to hit your target income

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

Your Financial Independence number and years to retire early

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

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

Pomodoro sessions, breaks, and finish time for any task

Realistic finish date from effort, team size, and buffer

Convert hourly wage to weekly, monthly, and annual pay

How long a book takes to read at your daily pace