Calculators
Browse all 268 free calculators organized by category
Financial calculators
Mortgage, loan, investment, tax, and retirement calculators.
Mortgage Calculator
Calculate your monthly mortgage payment, total interest, and amortization schedule
Emergency Fund Calculator
Calculate how much you need to save for an emergency fund based on monthly expenses.
Latte Factor Calculator
See how much your daily small habits (like coffee) cost you over time with compound interest.
FIRE Calculator
Financial Independence, Retire Early. Calculate your 'Freedom Number' based on the 25x rule.
Crypto Profit/Loss Calculator
Calculate your profit or loss from a cryptocurrency trade including fees.
Dollar Cost Averaging (DCA) Calculator
Visualize the power of consistent investing vs lump sum.
Compound Interest Calculator
Calculate compound interest on investments and savings
Loan Calculator
Calculate loan payments, total interest, and amortization schedule for personal loans
Auto Loan Calculator
Calculate monthly auto loan payments and total interest for car financing
Health and fitness calculators
BMI, calories, macros, and pregnancy timing tools.
BMI Calculator
Calculate your Body Mass Index (BMI) to determine if you're at a healthy weight. Includes BMI Prime, Ponderal Index, and healthy weight range.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) to determine how many calories your body burns at rest
Calorie Calculator
Calculate your daily calorie needs based on your BMR and activity level
Body Fat Calculator
Estimate your body fat percentage using various methods
Ideal Weight Calculator
Calculate your ideal body weight based on height and gender
Body Surface Area Calculator
Calculate body surface area (BSA) using Du Bois formula
Waist-to-Hip Ratio Calculator
Calculate waist-to-hip ratio to assess health risks
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level
Body Water Calculator
Calculate total body water using Watson formula
Math calculators
Percentages, geometry, statistics, and algebra tools.
Percentage Calculator
Calculate percentages, percentage change, and percentage of a number
Percentage Change Calculator
Calculate the percentage change between two values
Square Root Calculator
Calculate the square root of any number
Exponent Calculator
Calculate base raised to the power of exponent
Average Calculator
Calculate the average (mean) of a set of numbers
Factorial Calculator
Calculate the factorial of a number (n!)
Permutation Calculator
Calculate the number of permutations P(n, r)
Combination Calculator
Calculate the number of combinations C(n, r)
GCD Calculator
Calculate the Greatest Common Divisor (GCD) of two numbers
Technology and developer tools
Encoding, hashes, colors, network, and SEO utilities.
Password Generator
Generate secure, random passwords with customizable length and character options
Base64 Encoder
Encode text to Base64 format for secure data transmission
Base64 Decoder
Decode Base64 encoded text back to original format
JSON Formatter
Format and beautify messy JSON code with proper indentation
Aspect Ratio Calculator
Calculate aspect ratio from width and height dimensions (16:9, 4:3, etc.)
Hex to RGB Converter
Convert hexadecimal color codes to RGB values
RGB to Hex Converter
Convert RGB color values to hexadecimal color code
Engagement Rate Calculator
Calculate engagement rate for Instagram, TikTok, or YouTube.
Video File Size Calculator
Estimate video file size based on resolution, duration, and fps.
Business and e-commerce calculators
VAT, fees, margins, and advertising return tools.
Commission Calculator
Calculate sales commission, deductions, and net profit for e-commerce and marketplace sellers
VAT / KDV Calculator
Calculate VAT (Value Added Tax / KDV) - add or remove VAT from prices
Inflation Adjusted Calculator
Calculate how inflation affects the purchasing power of your money over time
Freelance Rate Calculator
Calculate your ideal hourly and daily rate based on expenses, profit goals, and working hours
Customer Acquisition Cost (CAC) Calculator
Calculate the cost of acquiring a new customer based on marketing and sales spend
Social Media Ad Spend ROI Calculator
Calculate return on investment (ROI) and return on ad spend (ROAS) for social media advertising campaigns on Meta, Google, TikTok, and other platforms.
SaaS Churn Rate Calculator
Calculate customer churn rate, retention rate, and annual projections for subscription-based businesses. Track customer loss and retention metrics.
PayPal Fee Calculator
Estimate PayPal fees, take-home amount, or the amount you should charge.
Stripe Fee Calculator
Calculate Stripe processing fees, net payout, or the amount to charge.
Education and science calculators
GPA, grades, and science converters.
GPA Calculator
Calculate your Grade Point Average (GPA) from your grades and credit hours
Weighted Average Calculator
Calculate the weighted average of a set of values with their corresponding weights
Binary / Hexadecimal Converter
Convert numbers between Binary, Octal, Decimal, and Hexadecimal number systems
Scientific Notation Calculator
Convert numbers to and from scientific notation format
Ohm's Law Calculator
Solve voltage, current, resistance, and power from any two known values.
Voltage Drop Calculator
Calculate voltage loss, drop percentage, and load voltage.
Battery Runtime Calculator
Estimate usable battery energy and runtime from voltage, amp-hours, and load.
LED Resistor Calculator
Calculate a safe series resistor, resistor power, and a standard value.
Grade Calculator
Calculate a weighted course grade and the score needed on a remaining exam.
Daily life and home calculators
Cooking, home projects, travel, and household planning.
Intermittent Fasting Calculator
Calculate your fasting and eating windows based on popular intermittent fasting protocols
Sleep Calculator
Calculate the best bedtime based on sleep cycles to wake up refreshed
Pet Age Calculator
Convert your pet's age to human years for dogs and cats
Gas Cost Calculator
Calculate the fuel cost for your trip based on distance, fuel efficiency, and gas price
Cooking Units Converter
Convert between common cooking measurements like cups, tablespoons, milliliters, and more
Words Per Minute (WPM) Calculator
Calculate your typing or reading speed in words per minute
Sentence & Word Counter
Count sentences, words, characters, and paragraphs in your text
AC BTU Calculator
Calculate the required BTU for your Air Conditioner based on room size.
Wallpaper Calculator
Estimate how many rolls of wallpaper you need for a room.
Date, time, and conversion tools
Unit converters, dates, and miscellaneous utilities.
Tip Calculator
Calculate tip amount and total bill including tip
Age Calculator
Calculate your exact age in years, months, and days
Date Calculator
Calculate the difference between two dates in days, weeks, months, and years
Discount Calculator
Calculate discount amount and final price after discount
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Length Converter
Convert between different length units (meters, kilometers, inches, feet, etc.)
Weight Converter
Convert between different weight units (kilograms, pounds, ounces, etc.)
Days Between Dates Calculator
Calculate the number of days, weeks, months, and years between two dates
Add Days to Date Calculator
Add or subtract days from a date