190+ Free Online Calculators
Every calculator shows its formula, worked examples, and a plain-English guide — from mortgages and BMI to the newest 2026 tax rules. Nothing to install, nothing to sign up for.
Quick Scientific Calculator
Type or tap an expression — supports √, powers, trig, log, π and parentheses. Press Enter or = to evaluate.
Popular Calculators
View AllCompound Interest Calculator
Calculate compound interest with any compounding frequency
Loan Calculator
Free loan calculator — monthly payment, total interest, and amortization for any loan
Mortgage Calculator
Complete mortgage analysis with amortization
Percentage Calculator
Calculate percentage, percentage change, and percentage of total
BMI Calculator
Calculate Body Mass Index and category
Calorie Calculator
Daily calorie needs based on your goals
Age Calculator
Calculate exact age in years, months, and days
Date Difference
Find the difference between two dates
Tip Calculator
Calculate tip and split the bill
GPA Calculator
Calculate weighted and unweighted GPA
All Categories
Finance
12 calculators
401(k) Calculator
Project your 401(k) balance at retirement with employer match
HELOC Calculator
How much home equity credit you can borrow and what it costs
Compound Interest Calculator
Calculate compound interest with any compounding frequency
Simple Interest Calculator
Calculate simple interest on loans, savings, or investments with the formula shown
Loan Calculator
Free loan calculator — monthly payment, total interest, and amortization for any loan
Mortgage Calculator
Complete mortgage analysis with amortization
ROI Calculator
Calculate return on investment (ROI) and annualized ROI for any investment
Net Worth Calculator
Add up your assets and liabilities to calculate your total net worth
Debt Payoff Calculator
See exactly when you’ll be debt-free and compare snowball vs. avalanche payoff strategies
Retirement Calculator
Are you saving enough for retirement?
Savings Goal Calculator
Find out how much to save monthly or how long it takes to reach your savings goal
Investment Growth Calculator
Project the future value of your investment portfolio with regular contributions
Mathematics
12 calculators
Percentage Calculator
Calculate percentage, percentage change, and percentage of total
Scientific Calculator
Full scientific calculator with functions
Fraction Calculator
Add, subtract, multiply, and divide fractions
Area Calculator
Calculate area of circles, rectangles, triangles, and more
Volume Calculator
Calculate volume of cubes, spheres, cylinders, and more
Slope Calculator
Calculate slope between two points
Standard Deviation Calculator
Calculate population and sample standard deviation and variance
Average Calculator
Calculate the average (mean), median, mode, and range of any number set
Quadratic Equation
Solve quadratic equations using the formula
Logarithm Calculator
Calculate natural and common logarithms
Exponent Calculator
Calculate powers and exponents
Factorial Calculator
Calculate factorial and permutations
Unit Converters
12 calculators
Length Converter
Convert between meters, feet, inches, miles, and more
Weight Converter
Convert between kg, lbs, ounces, grams, and tons
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin
Time Converter
Convert between seconds, minutes, hours, days, and years
Speed Converter
Convert between mph, km/h, m/s, and knots
Pressure Converter
Convert between psi, bar, Pa, atm, and mmHg
Energy Converter
Convert between joules, calories, kWh, and BTU
Power Converter
Convert between watts, horsepower, and kilowatts
Data Storage Converter
Convert between bytes, KB, MB, GB, TB, and PB
Angle Converter
Convert between degrees, radians, and gradians
Area Converter
Convert between square meters, acres, hectares, and more
Volume Converter
Convert between liters, gallons, cubic meters, and more
Health & Fitness
11 calculators
TDEE Calculator
Total daily energy expenditure and calorie targets for your goal
BMI Calculator
Calculate Body Mass Index and category
Calorie Calculator
Daily calorie needs based on your goals
Body Fat Percentage
Estimate body fat percentage
Ideal Weight
Calculate your ideal weight range
BMR Calculator
Basal Metabolic Rate calculation
Water Intake
Daily water intake recommendation
Running Pace
Calculate running pace and split times
One Rep Max
Estimate your maximum lift weight
Macro Calculator
Calculate daily protein, carbs, and fat
Heart Rate Zones
Calculate target heart rate zones
Date & Time
10 calculators
Age Calculator
Calculate exact age in years, months, and days
Date Difference
Find the difference between two dates
Add/Subtract Date
Add or subtract days, months, or years from a date
Day of Week
Find the day of the week for any date
Countdown Timer
Countdown to any date in the future
Working Days
Calculate working days between two dates
Leap Year
Check if a year is a leap year
Hours Calculator
Calculate hours and minutes between two times
Pregnancy Due Date
Calculate estimated due date
Chronological Age
Calculate exact chronological age
Tax & Salary
11 calculators
Income Tax Calculator
Estimate income tax and take-home pay based on earnings
GST/HST Calculator (Canada)
Add or remove GST, HST, PST and QST for every province
Sales Tax Calculator
Calculate total price with sales tax, or work tax backwards
Paycheck Calculator
Net paycheck after deductions
Hourly to Salary
Convert hourly rate to annual salary
Salary to Hourly
Convert annual salary to hourly rate
Overtime Calculator
Calculate overtime pay at time and a half or double time
Commission Calculator
Calculate commission earnings
Tip Calculator
Calculate tip and split the bill
VAT Calculator
Calculate VAT on purchases
Raise Calculator
Calculate new salary after raise
Construction
10 calculators
Concrete Calculator
Calculate concrete volume needed
Paint Calculator
Calculate paint needed for a room
Roofing Calculator
Calculate roofing materials needed
Tile Calculator
Calculate tiles needed for a floor
Gravel Calculator
Calculate gravel volume for landscaping
Flooring Cost
Estimate flooring material costs
Drywall Calculator
Calculate drywall sheets needed
Insulation Calculator
Calculate insulation needed
Staircase Calculator
Calculate staircase dimensions
Lumber Calculator
Calculate lumber quantity needed
Business
10 calculators
Margin Calculator
Calculate gross and net profit margins from cost and revenue
Break-Even
Calculate break-even point
Markup Calculator
Calculate markup percentage
Discount Calculator
Calculate discount price and percentage
Price Elasticity
Calculate price elasticity of demand
CAGR Calculator
Calculate compound annual growth rate
Inventory Turnover
Calculate inventory turnover ratio
Customer Lifetime Value Calculator (CLV)
Calculate CLV and see how it compares to your acquisition cost
Revenue Calculator
Calculate projected revenue
Burn Rate
Calculate monthly burn rate
Fun & Viral
15 calculators
Love Calculator
Calculate love compatibility percentage between two names
Crush Compatibility
Calculate fun compatibility with your crush
Soulmate Predictor
Predict fun soulmate traits based on birth date
Friendship Score
Calculate fun friendship score based on shared interests
Marriage Compatibility
Calculate fun marriage compatibility score
Breakup Recovery Time
Estimate fun recovery timeline after a breakup
Age on Other Planets
Calculate your age on Mercury, Venus, Mars, and other planets
Planetary Weight
Calculate your weight on different planets and moons
Lucky Number Calculator
Find your fun lucky number based on birth date and name
Love Language Calculator
Discover your fun love language profile
Zodiac Compatibility
Calculate fun zodiac sign compatibility
Spirit Animal Calculator
Discover your fun spirit animal based on personality
Superhero Name Generator
Generate a fun superhero name and powers
Rap Name Generator
Generate a fun rapper name based on your real name
Band Name Generator
Generate a fun band name for your group
Random & Fun
10 calculators
Random Number
Generate random numbers in a range
Coin Flip
Flip a virtual coin
Dice Roller
Roll virtual dice
Random Name
Generate random names
Password Generator
Generate secure random passwords
Random Color
Generate random colors with hex codes
Random Letter
Generate random letters
Yes/No Generator
Make a yes or no decision
List Shuffler
Shuffle a list of items randomly
Random Picker
Pick a random item from a list
Science
10 calculators
Force Calculator
Calculate force using Newton's second law
Acceleration
Calculate acceleration from velocity
Density Calculator
Calculate density of materials
Ohm's Law
Calculate voltage, current, or resistance
Wavelength
Calculate wavelength from frequency
Gravity Calculator
Calculate gravitational force
Molarity Calculator
Calculate molarity of solutions
Molecular Weight
Calculate molecular weight from formula
pH Calculator
Calculate pH from concentration
Doppler Effect
Calculate Doppler shift frequency
Grade & School
10 calculators
GPA Calculator
Calculate weighted and unweighted GPA
Grade Calculator
Calculate final grade from components
Final Grade Calculator
What grade do you need on the final to hit your target?
Test Score
Calculate test score percentage
Weighted Average
Calculate weighted average of grades
Class Rank Percentile
Calculate percentile rank
Study Hours
Calculate optimal study hours
Reading Speed
Calculate words per minute
SAT/ACT Score
Convert SAT to ACT scores
CGPA Calculator
Calculate cumulative GPA
Text & String
10 calculators
Word Counter
Count words, characters, and paragraphs
Character Counter
Count characters with and without spaces
Reading Time
Estimate reading time for text
Speaking Time
Estimate speaking time for a speech
Case Converter
Convert text between cases
Slug Generator
Generate URL slugs from text
Text Diff
Compare two texts for differences
Text Statistics
Analyze text readability and complexity
Text Replace
Find and replace text
Text Reverser
Reverse text or words
Web & Dev
10 calculators
PX to REM
Convert pixels to REM units
Hex to RGB
Convert hex colors to RGB
RGB to Hex
Convert RGB to hex color codes
Aspect Ratio
Calculate aspect ratio dimensions
Screen Resolution
Calculate PPI and screen density
Download Time
Estimate download time for files
File Size
Convert between file size units
Bandwidth Calculator
Calculate data transfer rate
Base64 Encoder
Encode and decode base64 strings
Hash Calculator
Calculate MD5, SHA-1, SHA-256 hashes
Other Tools
10 calculators
Tip Splitter
Split bill and tip among friends
Letter Grade
Convert percentage to letter grade
Percentage Change Calculator
Calculate the percent increase or decrease between two values instantly
Ratio Calculator
Simplify and calculate ratios
Proportion Calculator
Solve proportion equations
GCF & LCM
Calculate greatest common factor and least common multiple
Permutation
Calculate permutations and combinations
Confidence Interval
Calculate confidence intervals
Sample Size
Calculate required sample size
Significant Figures
Calculate significant figures
Digital Marketing
17 calculators
CPA Calculator
Calculate cost per acquisition from ad spend and conversions
CPM Calculator
Calculate cost per 1,000 impressions for any ad campaign
CPC Calculator
Calculate cost per click and clicks per dollar of ad spend
CTR Calculator
Calculate click-through rate from clicks and impressions
Conversion Rate Calculator
Calculate conversion rate from conversions and visitors or clicks
ROAS Calculator
Calculate return on ad spend, ROAS percentage, and net return
CPL Calculator
Calculate cost per lead and effective cost per customer
Break-Even ROAS Calculator
Find the minimum ROAS your ads need to be profitable from your margin
Ad Budget Calculator
Work out the ad budget needed to hit a revenue or conversions goal
Cost per Follower Calculator
Calculate the cost of each new follower from a paid growth campaign
Engagement Rate Calculator
Calculate ER% by followers from likes, comments, shares, and saves
Engagement Rate by Reach
Calculate engagement rate based on accounts reached instead of followers
Follower Growth Calculator
Calculate follower growth or decline rate and daily average change
Reach Rate Calculator
See what percentage of your followers your content actually reaches
Average Engagement Calculator
Calculate average engagements per post across a posting period
Video Completion Rate
Calculate video completion rate and average watch-through percentage
Marketing Report Builder
Enter campaign data to generate a full report — CPA, ROAS, ER%, follower growth — exportable as CSV and PDF
180+
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