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Free Online Calculators

200+ free online calculators for finance, math, health, construction, business and more. Instant results, 100% free, no signup required.

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Popular Calculators

Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule
Loan Calculator
Calculate loan payments, interest, and total cost
BMI Calculator
Calculate Body Mass Index with healthy range
Age Calculator
Calculate exact age with zodiac and birthday countdown
Percentage Calculator
Calculate percentages, increases, and decreases
Compound Interest Calculator
Calculate compound interest with regular contributions
Tip Calculator
Calculate tip amount and split bill among people
Salary Calculator
Convert salary between hourly, weekly, monthly, and yearly
Concrete Calculator
Calculate concrete needed for slabs, footings, columns
Timestamp Converter
Convert Unix timestamps to dates and back
Color Converter
Convert between HEX, RGB, HSL, CMYK
Length Converter
Convert between meters, feet, inches, miles, km
Calorie Calculator
Calculate daily calorie needs based on activity
ROI Calculator
Calculate return on investment percentage and profit
Discount Calculator
Calculate discounted price and savings amount
Standard Deviation Calculator
Calculate standard deviation and variance

Browse by Category

Finance
40 calculators
Math
35 calculators
Date & Time
25 calculators
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25 calculators
Health
20 calculators
Construction
20 calculators
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15 calculators
Statistics
10 calculators
Physics & Technology
10 calculators

All Calculators (200)

Finance40
Mortgage Calculator
Calculate monthly mortgage payments, total interest, and amortization schedule
Loan Calculator
Calculate loan payments, interest, and total cost
Compound Interest Calculator
Calculate compound interest with regular contributions
Simple Interest Calculator
Calculate simple interest on investments or loans
ROI Calculator
Calculate return on investment percentage and profit
Present Value Calculator
Calculate present value of future cash flows
Future Value Calculator
Calculate future value of an investment
Annuity Calculator
Calculate annuity future and present values
Amortization Calculator
Generate full amortization schedule for a loan
Discount Calculator
Calculate discounted price and savings amount
Sales Tax Calculator
Calculate sales tax and total price
Salary Calculator
Convert salary between hourly, weekly, monthly, and yearly
Inflation Calculator
Calculate the effect of inflation on money over time
Savings Calculator
Calculate savings growth with regular contributions
Retirement Calculator
Plan your retirement savings and projected income
Debt Payoff Calculator
Plan debt payoff with avalanche or snowball method
Credit Card Payoff
Calculate how long to pay off credit card debt
Net Worth Calculator
Calculate your net worth from assets and liabilities
Break Even Calculator
Find the break-even point for your business
Payback Period Calculator
Calculate how long to recoup an investment
IRR Calculator
Calculate internal rate of return for investments
NPV Calculator
Calculate net present value of cash flows
Cap Rate Calculator
Calculate capitalization rate for real estate
Rule of 72 Calculator
Calculate how long to double your money
Dollar Cost Averaging
Calculate returns on dollar cost averaging strategy
Bond Yield Calculator
Calculate current yield and yield to maturity
Tip Calculator
Calculate tip amount and split bill among people
Currency Converter
Convert between major world currencies
Margin Calculator
Calculate profit margin and markup percentage
Markup Calculator
Calculate selling price from cost and markup
Unit Price Comparator
Compare unit prices to find the best value
Expense Ratio Calculator
Calculate fund expense ratio
APR Calculator
Calculate annual percentage rate of a loan
CD Calculator
Calculate certificate of deposit returns and APY
Money Market Calculator
Calculate money market account growth
Home Affordability
Calculate how much home you can afford
Rent vs Buy Calculator
Compare costs of renting vs buying a home
Refinance Calculator
Calculate savings from refinancing your mortgage
Down Payment Calculator
Calculate down payment and monthly mortgage
Closing Costs Calculator
Estimate closing costs for home purchase
Math35
Percentage Calculator
Calculate percentages, increases, and decreases
Fraction Calculator
Add, subtract, multiply, divide fractions
Ratio Calculator
Simplify and scale ratios
Proportion Calculator
Solve proportions and cross-multiply
Average Calculator
Calculate mean, median, mode, range
Median Calculator
Find the median of a data set
Mode Calculator
Find the mode of a data set
Standard Deviation Calculator
Calculate standard deviation and variance
Variance Calculator
Calculate variance of a data set
Percentile Calculator
Find the value at a given percentile
Z-Score Calculator
Calculate z-score and percentile rank
Combination Calculator
Calculate combinations and permutations
Permutation Calculator
Calculate permutations of items
GCD & LCM Calculator
Find greatest common divisor and least common multiple
Prime Number Checker
Check if a number is prime and find factors
Logarithm Calculator
Calculate logarithms with any base
Exponential Calculator
Calculate exponential functions
Scientific Notation Converter
Convert to and from scientific notation
Number Base Converter
Convert between binary, octal, decimal, hex
Random Number Generator
Generate random numbers within a range
Sequence Calculator
Generate Fibonacci, Lucas, arithmetic, geometric sequences
Quadratic Calculator
Solve quadratic equations step by step
Pythagorean Calculator
Calculate triangle sides using Pythagorean theorem
Modulo Calculator
Calculate remainder of division
Matrix Calculator
Perform matrix operations: add, multiply, determinant
Big Number Calculator
Perform calculations with large numbers
Aspect Ratio Calculator
Calculate dimensions from aspect ratios
Statistics Calculator
Complete descriptive statistics analysis
Mean Median Mode
Calculate mean, median, and mode together
Probability Calculator
Calculate probability and odds
Sig Fig Calculator
Round to significant figures
Rounding Calculator
Round numbers with different methods
Binary Calculator
Perform binary arithmetic operations
Hex Calculator
Hexadecimal calculator
Scientific Calculator
Full-featured scientific calculator
Date & Time25
Age Calculator
Calculate exact age with zodiac and birthday countdown
Date Calculator
Add or subtract days from a date, or find difference
Timezone Converter
Convert times between different timezones
Business Days Calculator
Count business days between two dates
Leap Year Checker
Check if a year is a leap year
Day of Week Calculator
Find what day of the week a date falls on
Week Number Calculator
Find the ISO week number of a date
Time Between Calculator
Calculate time between two dates
Countdown Timer
Set a countdown timer
Pomodoro Timer
Pomodoro technique work timer
World Clock Converter
Compare times across world timezones
Date Format Converter
Convert between date formats
Timezone Offset Calculator
Calculate timezone offsets from UTC
Timezone Meeting Planner
Plan meetings across multiple timezones
Timestamp Converter
Convert Unix timestamps to dates and back
Unix Timestamp
Current Unix timestamp in seconds and milliseconds
Epoch Converter
Convert epoch time to human-readable dates
Date to Unix Timestamp
Convert any date to Unix timestamp
Timestamp to Date
Convert Unix timestamp to readable date
Stopwatch
Online stopwatch with lap times
Duration Calculator
Calculate duration between two times
Time Addition
Add hours and minutes together
Time Subtraction
Subtract time values
Calendar Difference
Calculate calendar differences between dates
Work Hours Calculator
Calculate total work hours between dates
Conversion25
Length Converter
Convert between meters, feet, inches, miles, km
Weight Converter
Convert between kg, lbs, oz, stones, tons
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin
Area Converter
Convert between sq meters, sq feet, acres, hectares
Volume Converter
Convert between liters, gallons, cups, oz
Speed Converter
Convert between km/h, mph, knots, m/s
Time Unit Converter
Convert between seconds, minutes, hours, days, years
Data Storage Converter
Convert between bytes, KB, MB, GB, TB
Pressure Converter
Convert between Pa, PSI, bar, atm, mmHg
Energy Converter
Convert between joules, calories, kWh, BTU
Force Converter
Convert between newtons, kilonewtons, pound-force
Angle Converter
Convert between degrees, radians, gradians
Fuel Economy Converter
Convert between MPG, km/L, L/100km
Power Converter
Convert between watts, kilowatts, horsepower
Torque Converter
Convert between Nm, ft-lb, in-lb
Density Converter
Convert between kg/m3, g/cm3, lb/ft3
Frequency Converter
Convert between Hz, kHz, MHz, GHz, RPM
Color Converter
Convert between HEX, RGB, HSL, CMYK
Roman Numeral Converter
Convert between Roman and decimal numbers
Text to Binary
Convert text to binary code
Binary to Text
Convert binary code to text
Hex to Decimal
Convert hexadecimal to decimal
Decimal to Hex
Convert decimal to hexadecimal
Octal Converter
Convert between octal and decimal
Metric Converter
Convert between metric and imperial units
Health20
BMI Calculator
Calculate Body Mass Index with healthy range
Calorie Calculator
Calculate daily calorie needs based on activity
Body Fat Calculator
Estimate body fat percentage using Navy method
Macro Calculator
Calculate protein, carbs, and fat macros
Heart Rate Calculator
Calculate target heart rate zones
Running Pace Calculator
Calculate running pace, speed, and splits
Pregnancy Calculator
Calculate due date and pregnancy milestones
Water Intake Calculator
Calculate daily water intake recommendation
Sleep Calculator
Calculate optimal sleep times and cycles
Ideal Weight Calculator
Calculate ideal weight using multiple formulas
Body Type Calculator
Determine body type based on measurements
BMR Calculator
Calculate basal metabolic rate
Body Surface Area
Calculate body surface area
Lean Body Mass
Calculate lean body mass
Protein Intake Calculator
Calculate daily protein needs
Max Heart Rate
Calculate maximum heart rate by age
Target Heart Rate
Calculate target heart rate for exercise
One Rep Max Calculator
Estimate one rep max from submaximal lifts
Step Calculator
Calculate steps from distance and stride
Blood Type Calculator
Predict possible blood types from parents
Construction20
Concrete Calculator
Calculate concrete needed for slabs, footings, columns
Roofing Calculator
Calculate roofing materials and bundles needed
Flooring Calculator
Calculate flooring materials with waste factor
Tile Calculator
Calculate tiles needed for floors and walls
Paint Calculator
Calculate paint needed for walls and ceilings
Brick Calculator
Calculate bricks needed for walls
Drywall Calculator
Calculate drywall sheets needed
Insulation Calculator
Calculate insulation R-value and materials
Lumber Calculator
Calculate lumber size for spans
Asphalt Calculator
Calculate asphalt for driveways and paths
Gravel Calculator
Calculate gravel needed in yards and tons
Soil Calculator
Calculate soil needed for gardening
Fencing Calculator
Calculate fencing panels and posts needed
Wallpaper Calculator
Calculate wallpaper rolls needed
Siding Calculator
Calculate siding materials for exterior walls
Foundation Calculator
Calculate concrete and rebar for foundation
Beam Load Calculator
Calculate beam load capacity
Stairs Calculator
Calculate stair dimensions and materials
Rafter Calculator
Calculate rafter length and cuts
Electrical Calculator
Calculate wire gauge and breaker size
Business15
Profit Margin Calculator
Calculate profit margin percentage
Business Markup Calculator
Calculate selling price from markup
Commission Calculator
Calculate commission from sales
Business Discount Calculator
Calculate discounted prices
Business Sales Tax Calculator
Calculate sales tax on purchases
Profit Loss Calculator
Calculate profit or loss from revenue and costs
Business Break Even Calculator
Find break-even point in units and revenue
Business ROI Calculator
Calculate return on investment
Business NPV Calculator
Calculate net present value
Business IRR Calculator
Calculate internal rate of return
Business Payback Period Calculator
Calculate investment payback period
Depreciation Calculator
Calculate asset depreciation over time
Inventory Turnover Calculator
Calculate inventory turnover ratio
Accounts Receivable
Calculate receivable turnover and DSO
Customer Lifetime Value
Calculate customer lifetime value (CLV)