Converters & Calculators
Convert units and run everyday calculators instantly.
Percentage Calculator
Work out percentages, ratios and percent change.
BMI Calculator
Calculate body mass index in metric or imperial units.
Age Calculator
Find your exact age in years, months and days.
Tip Calculator
Split the bill and work out the tip per person.
Discount Calculator
See how much you save and the final sale price.
Roman Numeral Converter
Convert numbers to Roman numerals and back.
Number to Words
Spell any whole number out in English words.
Data Size Converter
Convert between bytes, KB, MB, GB, TB and PB.
Length Converter
Convert meters, miles, feet, inches and more.
Weight Converter
Convert kg, pounds, ounces, stones and more.
Temperature Converter
Convert Celsius, Fahrenheit and Kelvin.
Area Converter
Convert square meters, acres, hectares and more.
Volume Converter
Convert liters, gallons, cups and more.
Speed Converter
Convert km/h, mph, knots and m/s.
Time Converter
Convert seconds, minutes, hours, days and years.
Pressure Converter
Convert bar, PSI, pascals and atmospheres.
Energy Converter
Convert joules, calories, kWh and BTU.
Angle Converter
Convert degrees, radians, gradians and turns.
Compound Interest Calculator
Project savings growth with compound interest.
Loan EMI Calculator
Calculate monthly loan payments and interest.
Frequency Converter
Convert Hz, kHz, MHz, GHz and RPM.
Power Converter
Convert watts, kilowatts, horsepower and BTU/h.
Force Converter
Convert newtons, pound-force, kgf and dynes.
Torque Converter
Convert newton-meters, pound-feet and kgf·m.
Data Transfer Rate
Convert bps, Mbps, Gbps and MB/s.
Illuminance Converter
Convert lux, foot-candles and phot.
Acceleration Converter
Convert m/s², g-force and ft/s².
Flow Rate Converter
Convert L/s, L/min, m³/h and gal/min.
Astronomical Distance
Convert km, AU, light-years and parsecs.
Electric Charge Converter
Convert coulombs, mAh and Ah.
Voltage Converter
Convert volts, millivolts and kilovolts.
Electric Current Converter
Convert amperes, milliamperes and kiloamperes.
Resistance Converter
Convert ohms, kilohms and megohms.
Capacitance Converter
Convert farads, µF, nF and pF.
Inductance Converter
Convert henries, mH and µH.
Blood Sugar Converter
Convert glucose between mg/dL and mmol/L.
Fuel Economy Converter
Convert MPG, km/L and L/100km.
Sum Numbers
Add up a list of numbers.
Average Calculator
Find the mean of a list of numbers.
Median Calculator
Find the median of a list of numbers.
Min & Max Finder
Find the smallest and largest numbers.
Multiply Numbers
Multiply a list of numbers together.
Sort Numbers
Sort numbers in ascending order.
Count Numbers
Count how many numbers are in the text.
Round Numbers
Round each number to the nearest integer.
Absolute Values
Convert each number to its absolute value.
Cumulative Sum
Running total of a list of numbers.
Digit Sum
Add together all digits in the input.
Reverse Number Digits
Reverse the digits of a number.
Square Numbers
Square each number in the list.
Percent of Total
Show each number as a % of the total.
Ordinal Number Converter
Turn numbers into 1st, 2nd, 3rd…
Factorial Calculator
Compute n! for a whole number.
Prime Number Checker
Check whether a number is prime.
Prime Factorization
Break a number into its prime factors.
GCD Calculator
Greatest common divisor of numbers.
LCM Calculator
Least common multiple of numbers.
Fibonacci Generator
Generate the first n Fibonacci numbers.
Random Number Generator
Generate ten random numbers from 1 to 100.
Days Between Dates
Count the days between two dates.
Weekday Finder
Find the day of the week for a date.
Days Until Date
Count down the days until a date.
Age in Days
How many days old are you?
Leap Year Checker
Check if a year is a leap year.
Week Number
Find the ISO week number of a date.
Day of the Year
Which day of the year is a date?
Quarter Finder
Find the fiscal quarter of a date.
Days in Month
How many days are in a month?
Zodiac Sign Finder
Find the zodiac sign for a birth date.
Chinese Zodiac
Find the Chinese zodiac animal for a year.
Time Ago
Convert a date into 'time ago' text.
Current Unix Timestamp
Get the current Unix timestamp now.
Current Date & Time
Show the current date and time.
Mode Finder
Find the most common number(s).
Sum of Squares
Add up the squares of numbers.
Reverse Number List
Reverse the order of a number list.
Even Numbers Filter
Keep only the even numbers.
Odd Numbers Filter
Keep only the odd numbers.
Positive Numbers Filter
Keep only positive numbers.
Negative Numbers Filter
Keep only negative numbers.
Deduplicate Numbers
Remove repeated numbers.
Normalize Numbers (0–1)
Scale numbers to a 0–1 range.
Number to Percentage
Multiply numbers by 100 and add %.
Percentage to Decimal
Convert percentages to decimals.
Scientific Notation
Convert numbers to scientific notation.
Round to 2 Decimals
Round each number to two decimals.
Floor Numbers
Round each number down to an integer.
Ceiling Numbers
Round each number up to an integer.
Double Numbers
Multiply each number by two.
Halve Numbers
Divide each number by two.
Even/Odd Summary
Count even and odd numbers.
Standard Deviation
Population standard deviation of numbers.
Variance Calculator
Population variance of numbers.
Ratio Simplifier
Reduce a ratio to its simplest form.
Aspect Ratio Calculator
Find the aspect ratio of width × height.
Percentage Difference
Percent difference between two numbers.
Percentage of a Number
Find X% of a number.
Unit Price Calculator
Price per unit from total price and quantity.
Markup Calculator
Markup % from cost and selling price.
Fraction to Decimal
Convert a fraction like 3/4 to a decimal.
Fraction Simplifier
Reduce a fraction to lowest terms.
Decimal to Fraction
Convert a decimal to its closest fraction.
Time to Decimal Hours
Convert h:mm to decimal hours.
Decimal Hours to h:m
Convert decimal hours to hours and minutes.
Speed Calculator
Speed from distance and time.
Proportion Solver
Solve a:b = c:? for the missing value.
Midpoint / Average of Two
Find the midpoint of two numbers.
Dog Years Calculator
Convert human years to dog years.
Cat Years Calculator
Convert cat age to human-equivalent years.
Square Root
Find the square root of numbers.
Cube Root
Find the cube root of numbers.
Reciprocal Calculator
Find 1/x for each number.
Negate Numbers
Flip the sign of each number.
Number Comparison
Compare two numbers.
Power of Two Checker
Check if numbers are powers of two.