Calculators
Calculate Anna University GPA, attendance, age, and percentages, or convert scientific units and format text.
Anna University GPA & CGPA Calculator
Calculate credit-weighted GPA and CGPA for affiliated B.E. and B.Tech programmes under R2021 and R2025.
StudentsAttendance Calculator
Find your attendance percentage from class counts.
StudentsAttendance Target Calculator
Find how many consecutive classes to attend to reach your target.
StudentsMarks Percentage
Convert marks obtained and maximum marks into a percentage.
StudentsFinal Exam Score Calculator
Find the final exam score needed for your target course grade.
StudentsWord and Character Counter
Count words, characters and lines in an assignment or any text.
StudentsReading Time Calculator
Estimate reading time at 200 words per minute.
Text & codeUppercase Converter
Convert text to uppercase.
Text & codeLowercase Converter
Convert text to lowercase.
Text & codeRemove Duplicate Lines
Keep the first occurrence of each exact line.
Text & codeJSON Formatter
Validate and format JSON with two-space indentation.
Text & codeURL Encoder
Percent-encode text for use in a URL component.
Text & codeURL Decoder
Decode a percent-encoded URL component.
Text & codeBase64 Encoder
Encode UTF-8 text as Base64.
Text & codeBase64 Decoder
Decode Base64 into UTF-8 text.
Text & codeDecimal to Binary
Convert a whole decimal number to binary.
Text & codeBinary to Decimal
Convert a binary integer to decimal.
MathOnline Calculator
Calculate with arithmetic, powers, parentheses, and scientific functions. Trig functions use radians.
DatesAge Calculator
Find age in calendar years, months, and days. Shorter months use the last valid day.
DatesDays Between Dates
Count elapsed calendar days between two dates.
DatesAdd or Subtract Days
Move a date forward or backward by a whole number of days.
MathPercentage Calculator
Find a percentage of a number.
MathPercentage Change
Find the percentage increase or decrease from the original value.
MathAverage Calculator
Find the mean of numbers separated by spaces or commas.
GeometryPythagorean Calculator
Find the hypotenuse of a right triangle.
GeometryCircle Area
Find the area inside a circle from its radius.
GeometryRectangle Area
Find the area of a rectangle.
GeometrySphere Volume
Find the volume of a sphere from its radius.
GeometryCylinder Volume
Find volume from a cylinder’s radius and height.
ScienceDensity Calculator
Calculate density using kilograms and cubic metres.
ScienceOhm’s Law
Calculate voltage from current and resistance.
ScienceKinetic Energy
Calculate the kinetic energy of a moving object.
ScienceSpeed Calculator
Calculate average speed from distance and elapsed time.
EverydayDiscount Calculator
Find the final price after a percentage discount.
EverydayTip Calculator
Calculate the total per person including the tip.
Unit conversionsLength Converter
Convert between Metre (m), Kilometre (km), Centimetre (cm) and other supported units.
Unit conversionsMass Converter
Convert between Kilogram (kg), Gram (g), Milligram (mg) and other supported units.
Unit conversionsTemperature Converter
Convert between Celsius (°C), Fahrenheit (°F), Kelvin (K) and other supported units.
Unit conversionsArea Converter
Convert between Square metre (m²), Square kilometre (km²), Square foot (ft²) and other supported units.
Unit conversionsVolume Converter
Convert between Litre (L), Millilitre (mL), Cubic metre (m³) and other supported units.
Unit conversionsSpeed Converter
Convert between Metres per second (m/s), Kilometres per hour (km/h), Miles per hour (mph) and other supported units.
Unit conversionsTime Converter
Convert between Second, Millisecond, Microsecond and other supported units.
Unit conversionsPressure Converter
Convert between Pascal (Pa), Kilopascal (kPa), Bar and other supported units.
Unit conversionsEnergy Converter
Convert between Joule (J), Kilojoule (kJ), Watt-hour (Wh) and other supported units.
Unit conversionsPower Converter
Convert between Watt (W), Kilowatt (kW), Megawatt (MW) and other supported units.
Unit conversionsForce Converter
Convert between Newton (N), Kilonewton (kN), Dyne and other supported units.
Unit conversionsAngle Converter
Convert between Degree (°), Radian (rad), Turn and other supported units.
Unit conversionsFrequency Converter
Convert between Hertz (Hz), Kilohertz (kHz), Megahertz (MHz) and other supported units.
Unit conversionsData Size Converter
Convert between Bit, Byte, Kilobyte and other supported units.
Unit conversionsElectric Current Converter
Convert between Ampere (A), Milliampere (mA), Microampere (µA) and other supported units.
Unit conversionsVoltage Converter
Convert between Volt (V), Millivolt (mV), Microvolt (µV) and other supported units.
Unit conversionsResistance Converter
Convert between Ohm (Ω), Milliohm (mΩ), Kilohm (kΩ) and other supported units.