Browse all 206 free calculators organized by category
Calculate your monthly mortgage payment, total interest, and amortization schedule
Calculate how much you need to save for an emergency fund based on monthly expenses.
See how much your daily small habits (like coffee) cost you over time with compound interest.
Financial Independence, Retire Early. Calculate your 'Freedom Number' based on the 25x rule.
Calculate your profit or loss from a cryptocurrency trade including fees.
Visualize the power of consistent investing vs lump sum.
Calculate compound interest on investments and savings
Calculate loan payments, total interest, and amortization schedule for personal loans
Calculate monthly auto loan payments and total interest for car financing
Calculate future value of investments with regular contributions
Calculate simple interest on loans and investments
Calculate Return on Investment (ROI) percentage
Calculate markup percentage and selling price from cost
Calculate profit margin percentage from cost and selling price
Calculate sales tax amount and total price including tax
Calculate the price per unit from total price and quantity
Calculate the present value of a future amount
Calculate the future value of a present amount
Calculate how long it takes to recover an investment
Calculate your debt-to-income ratio to assess financial health
Calculate Annual Percentage Rate (APR) for loans
Calculate how long it will take to reach your savings goal
Calculate how long it will take to pay off your credit card debt
Calculate loan-to-value (LTV) ratio for mortgages
Calculate how much you need to save for retirement
Calculate tax amount and after-tax income
Calculate your net salary from gross salary or gross salary from net salary. Includes tax, social security, unemployment insurance, and stamp tax calculations for 2026.
Convert between different currencies using exchange rates
Calculate annuity payments, total payment, and interest
Calculate the break-even point for your business
Calculate bond yield to maturity and current yield
Calculate stock return including price change and dividends
Compare two loans to find the better option
Calculate Net Present Value (NPV) of an investment
Calculate Internal Rate of Return (IRR) of an investment
Generate a detailed amortization schedule for your loan
Calculate the Effective Annual Rate (EAR) from nominal interest rate and compounding frequency
Calculate how long it takes for an investment to double using the Rule of 72
Calculate capital gains tax on investment sales
Calculate the future value of money adjusted for inflation
Calculate profit margin and gross margin from revenue and cost
Compare the costs of renting versus buying a home over time.
Estimate your tax deduction using the simplified method for home offices.
Estimate how long it takes for solar panels to pay for themselves.
Calculate the opportunity cost of choosing one investment over another
Calculate car value depreciation over time
Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight. Includes BMI Prime, Ponderal Index, and healthy weight range.
Calculate your Basal Metabolic Rate (BMR) to determine how many calories your body burns at rest
Calculate your daily calorie needs based on your BMR and activity level
Estimate your body fat percentage using various methods
Calculate your ideal body weight based on height and gender
Calculate body surface area (BSA) using Du Bois formula
Calculate waist-to-hip ratio to assess health risks
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level
Calculate total body water using Watson formula
Calculate daily calorie deficit needed to reach your target weight
Calculate protein, carbs, and fat grams based on daily calories and percentages
Calculate your target heart rate zones for different training intensities
Calculate daily protein requirements based on weight, activity level, and goals
Calculate daily water intake requirements based on weight and activity level
Calculate lean body mass and fat mass from total weight and body fat percentage
Estimate your ovulation date and fertile window based on your menstrual cycle
Calculate your estimated pregnancy due date based on your last menstrual period
Estimate your blood alcohol content based on drinks consumed, time elapsed, and body weight
Estimate your safe daily limit of caffeine based on body weight.
Calculate percentages, percentage change, and percentage of a number
Calculate the percentage change between two values
Calculate the square root of any number
Calculate base raised to the power of exponent
Calculate the average (mean) of a set of numbers
Calculate the factorial of a number (n!)
Calculate the number of permutations P(n, r)
Calculate the number of combinations C(n, r)
Calculate the Greatest Common Divisor (GCD) of two numbers
Calculate the Least Common Multiple (LCM) of two numbers
Calculate mean, variance, and standard deviation of a set of numbers
Calculate what percentage of a number equals another number
Calculate percentage increase or decrease between two values
Calculate and simplify ratios between two numbers
Calculate the area, circumference, and diameter of a circle
Calculate the area, perimeter, and diagonal of a rectangle
Calculate the area and perimeter of a triangle using Heron's formula
Calculate the missing side of a right triangle using Pythagorean theorem
Solve quadratic equations of the form ax² + bx + c = 0
Calculate the percentage difference between two values
Calculate percentage error between actual and theoretical values
Calculate the volume and surface area of a cube
Calculate the volume and surface area of a cylinder
Calculate the volume and surface area of a sphere
Calculate the volume and surface area of a cone
Calculate the area and perimeter of a trapezoid
Calculate the area and perimeter of a parallelogram
Calculate the area and perimeter of a rhombus
Calculate the area and perimeter of a regular hexagon
Calculate the area and perimeter of a regular octagon
Calculate the determinant of a 2x2 matrix
Multiply two 2x2 matrices
Calculate the derivative of a polynomial function
Calculate logarithm with any base, natural log, and log base 10
Calculate sine, cosine, and tangent of an angle
Calculate the median of a set of numbers
Calculate the mode (most frequent value) of a set of numbers
Calculate the integral (antiderivative) of a polynomial function
Calculate the range (difference between max and min) of a set of numbers
Calculate quartiles (Q1, Q2, Q3) and interquartile range (IQR)
Calculate variance, standard deviation, and mean of a set of numbers
Calculate the Z-score (standard score) of a value
Calculate the nth root of a number
Convert numbers to scientific notation format
Calculate the slope of a line from two points
Calculate the distance between two points in 2D space
Calculate the distance between two points in 3D space
Perform operations on complex numbers (add, subtract, multiply, divide)
Calculate the dot product of two 3D vectors
Calculate the cross product of two 3D vectors
Calculate probability using normal distribution
Calculate the probability of winning a lottery.
Calculate confidence intervals for statistical analysis
Calculate posterior probability using Bayes' theorem
Check if a number is prime and find its factors
Calculate and identify significant figures in a number
Generate secure, random passwords with customizable length and character options
Encode text to Base64 format for secure data transmission
Decode Base64 encoded text back to original format
Format and beautify messy JSON code with proper indentation
Calculate aspect ratio from width and height dimensions (16:9, 4:3, etc.)
Convert hexadecimal color codes to RGB values
Convert RGB color values to hexadecimal color code
Calculate engagement rate for Instagram, TikTok, or YouTube.
Estimate video file size based on resolution, duration, and fps.
Estimate potential earnings from the TikTok Creator Fund.
Check if your title and description length are optimal for Google.
Check WCAG compliance for text contrast between foreground and background colors
Calculate how long it will take to download a file based on file size and internet speed
Convert pixel values to REM units for responsive web design
Calculate password strength and entropy in bits
Calculate the cost of using AI models like GPT-4, Claude, and Gemini based on input and output tokens. Compare pricing across different AI providers.
Calculate pixel dimensions, quality loss, and file size changes when upscaling images. Compare different upscaling methods including AI-powered solutions.
Calculate sales commission, deductions, and net profit for e-commerce and marketplace sellers
Calculate VAT (Value Added Tax / KDV) - add or remove VAT from prices
Calculate how inflation affects the purchasing power of your money over time
Calculate your ideal hourly and daily rate based on expenses, profit goals, and working hours
Calculate the cost of acquiring a new customer based on marketing and sales spend
Calculate return on investment (ROI) and return on ad spend (ROAS) for social media advertising campaigns on Meta, Google, TikTok, and other platforms.
Calculate customer churn rate, retention rate, and annual projections for subscription-based businesses. Track customer loss and retention metrics.
Calculate your Grade Point Average (GPA) from your grades and credit hours
Calculate the weighted average of a set of values with their corresponding weights
Convert numbers between Binary, Octal, Decimal, and Hexadecimal number systems
Convert numbers to and from scientific notation format
Calculate your fasting and eating windows based on popular intermittent fasting protocols
Calculate the best bedtime based on sleep cycles to wake up refreshed
Convert your pet's age to human years for dogs and cats
Calculate the fuel cost for your trip based on distance, fuel efficiency, and gas price
Convert between common cooking measurements like cups, tablespoons, milliliters, and more
Calculate your typing or reading speed in words per minute
Count sentences, words, characters, and paragraphs in your text
Calculate the required BTU for your Air Conditioner based on room size.
Estimate how many rolls of wallpaper you need for a room.
Estimate the CO2 emissions for your flight.
Calculate the time difference between two offset zones.
Convert luggage weight between Kilograms (kg) and Pounds (lbs).
Convert between L/100km and MPG (US).
Estimate your life expectancy based on lifestyle factors. For entertainment only.
Calculate how long it takes to binge-watch a series.
Estimate watering frequency based on plant type and conditions.
Calculate water collection potential from your roof.
Calculate how many Pomodoro cycles you need to complete a task
Calculate productivity loss from context switching and multitasking
Calculate how long it takes to read a text based on word count
Calculate daily food requirements for your dog based on weight, age, and activity level
Calculate daily water intake requirements for your cat
Calculate aquarium volume and required heater wattage
Calculate baker's percentages for bread recipes
Calculate how much water to add to reduce alcohol content
Calculate pattern repeats and remaining rows for knitting and crochet projects
Calculate tip amount and total bill including tip
Calculate your exact age in years, months, and days
Calculate the difference between two dates in days, weeks, months, and years
Calculate discount amount and final price after discount
Convert between Celsius, Fahrenheit, and Kelvin
Convert between different length units (meters, kilometers, inches, feet, etc.)
Convert between different weight units (kilograms, pounds, ounces, etc.)
Calculate the number of days, weeks, months, and years between two dates
Add or subtract days from a date
Convert between different volume units (liters, gallons, cups, etc.)
Convert between different area units (square meters, acres, hectares, etc.)
Convert between different speed units (km/h, mph, m/s, knots)
Add or subtract time (hours, minutes, seconds)
Generate random numbers within a specified range
Convert numbers to words in English
Convert between different time units (seconds, minutes, hours, days, weeks, months, years)
Convert between different energy units (joules, calories, kilowatt-hours, BTU, etc.)
Convert between different power units (watts, kilowatts, horsepower, BTU/hour)
Convert between different pressure units (pascal, bar, psi, atm, torr)
Calculate the number of days until a specific date
Calculate the week number of the year for a given date
Calculate how many days have passed since a specific date
Convert numbers to Roman numerals and vice versa
Convert numbers between different number bases (binary, octal, decimal, hexadecimal)
Calculate electric vehicle charging time based on battery capacity and charging power
Compare tire sizes and calculate speedometer error
Convert between horsepower and torque
Calculate the wind chill temperature based on air temperature and wind speed
Calculate the heat index (feels-like temperature) based on temperature and humidity
Calculate the dew point temperature based on air temperature and humidity
Estimate light pollution and star visibility using the Bortle Scale