136 FREE TOOLS / 5 SUBCATEGORIES
Calculators & Utilities
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Math & Numbers
44 toolsUnit Converters
42 toolsDate & Time
19 toolsIndia Utilities
9 toolsHome & Everyday
22 toolsPercentage Calculator
Percentage Calculator with an instant result. Result = value × percentage ÷ 100.
Math & NumbersPercentage Change
Percentage Change with an instant result. Change = (new − original) ÷ |original| × 100. Original cannot be zero.
Math & NumbersPercentage Error
Percentage Error with an instant result. Absolute difference divided by the absolute accepted value, multiplied by 100.
Math & NumbersRatio Simplifier
Ratio Simplifier with an instant result. Divide both whole numbers by their greatest common divisor.
Math & NumbersFraction Simplifier
Fraction Simplifier with an instant result. Reduce a fraction to its lowest terms.
Math & NumbersFraction to Decimal
Fraction to Decimal with an instant result. Divide the numerator by a nonzero denominator.
Math & NumbersDecimal to Fraction
Decimal to Fraction with an instant result. Convert a finite decimal (up to six decimal places) into a reduced fraction.
Math & NumbersAverage Calculator
Average Calculator with an instant result. Sum of values divided by the number of values.
Math & NumbersMedian Calculator
Median Calculator with an instant result. Middle value after sorting; average the middle two for an even count.
Math & NumbersMode Calculator
Mode Calculator with an instant result. Return all values with the highest frequency.
Math & NumbersVariance Calculator
Variance Calculator with an instant result. Population variance: sum of squared deviations divided by N.
Math & NumbersStandard Deviation
Standard Deviation with an instant result. Population standard deviation: square root of population variance.
Math & NumbersHCF/GCD Calculator
HCF/GCD Calculator with an instant result. Greatest common divisor of nonnegative integers.
Math & NumbersLCM Calculator
LCM Calculator with an instant result. Least common multiple of nonnegative integers.
Math & NumbersPrime Number Checker
Prime Number Checker with an instant result. Test divisibility up to the square root; supports integers up to one billion.
Math & NumbersPrime Factorization
Prime Factorization with an instant result. Divide repeatedly by prime factors.
Math & NumbersSquare Root
Square Root with an instant result. Nonnegative square root.
Math & NumbersCube Root
Cube Root with an instant result. The real cube root, including for negative values.
Math & NumbersFactorial Calculator
Factorial Calculator with an instant result. Product of integers from 1 to N (N ≤ 170).
Math & NumbersPower Calculator
Power Calculator with an instant result. Raise the base to the given exponent.
Math & NumbersPermutation Calculator
Permutation Calculator with an instant result. nPr: ordered selections without replacement.
Math & NumbersCombination Calculator
Combination Calculator with an instant result. n choose r: unordered selections without replacement.
Math & NumbersProbability Calculator
Probability Calculator with an instant result. Probability = favorable outcomes ÷ total outcomes.
Math & NumbersQuadratic Equation Solver
Quadratic Equation Solver with an instant result. Solve ax² + bx + c = 0 using the quadratic formula.
Math & NumbersNumber Sequence Generator
Number Sequence Generator with an instant result. Arithmetic progression: start + index × step.
Math & NumbersRoman Numeral Converter
Roman Numeral Converter with an instant result. Convert a positive integer into standard Roman numerals.
Math & NumbersCircle Area
Circle Area with an instant result. Use consistent units. Formula: π × radius².
Math & NumbersCircle Circumference
Circle Circumference with an instant result. Use consistent units. Formula: 2 × π × radius.
Math & NumbersRectangle Area
Rectangle Area with an instant result. Use consistent units. Formula: length × width.
Math & NumbersSquare Area
Square Area with an instant result. Use consistent units. Formula: side².
Math & NumbersTriangle Area
Triangle Area with an instant result. Use consistent units. Formula: base × perpendicular height ÷ 2.
Math & NumbersTriangle Perimeter
Triangle Perimeter with an instant result. Use consistent units. Formula: Sum of three sides; the triangle inequality must hold..
Math & NumbersPythagorean Calculator
Pythagorean Calculator with an instant result. Use consistent units. Formula: hypotenuse = √(a² + b²).
Math & NumbersTrapezoid Area
Trapezoid Area with an instant result. Use consistent units. Formula: (a + b) × height ÷ 2.
Math & NumbersCylinder Volume
Cylinder Volume with an instant result. Use consistent units. Formula: π × radius² × height.
Math & NumbersCube Volume
Cube Volume with an instant result. Use consistent units. Formula: side³.
Math & NumbersSphere Volume
Sphere Volume with an instant result. Use consistent units. Formula: 4/3 × π × radius³.
Math & NumbersCone Volume
Cone Volume with an instant result. Use consistent units. Formula: π × radius² × height ÷ 3.
Math & NumbersSlope Calculator
Slope Calculator with an instant result. Use consistent units. Formula: (y₂ − y₁) ÷ (x₂ − x₁).
Math & NumbersKM to Miles
KM to Miles with an instant result. Miles = KM × 0.621371192237334.
Unit ConvertersMiles to KM
Miles to KM with an instant result. KM = Miles × 1.609344.
Unit ConvertersMeter to Feet
Meter to Feet with an instant result. Feet = Meter × 3.280839895013123.
Unit ConvertersFeet to Meter
Feet to Meter with an instant result. Meter = Feet × 0.3048.
Unit ConvertersInch to CM
Inch to CM with an instant result. CM = Inch × 2.54.
Unit ConvertersCM to Inch
CM to Inch with an instant result. Inch = CM × 0.39370078740157477.
Unit ConvertersKG to Pounds
KG to Pounds with an instant result. Pounds = KG × 2.2046226218487757.
Unit ConvertersPounds to KG
Pounds to KG with an instant result. KG = Pounds × 0.45359237.
Unit ConvertersGram to KG
Gram to KG with an instant result. KG = Gram × 0.001.
Unit ConvertersOunce to Gram
Ounce to Gram with an instant result. Gram = Ounce × 28.349523125.
Unit ConvertersSq Ft to Sq Meter
Sq Ft to Sq Meter with an instant result. Sq Meter = Sq Ft × 0.09290304.
Unit ConvertersSq Meter to Sq Ft
Sq Meter to Sq Ft with an instant result. Sq Ft = Sq Meter × 10.763910416709722.
Unit ConvertersAcre to Sq Ft
Acre to Sq Ft with an instant result. Sq Ft = Acre × 43560.
Unit ConvertersHectare to Acre
Hectare to Acre with an instant result. Acre = Hectare × 2.471053814671653.
Unit ConvertersLiter to ML
Liter to ML with an instant result. ML = Liter × 1000.
Unit ConvertersGallon to Liter
Gallon to Liter with an instant result. Liter = Gallon × 3.785411784. Uses the US liquid gallon.
Unit ConvertersCup to ML
Cup to ML with an instant result. ML = Cup × 236.5882365. Uses US customary cooking measures.
Unit ConvertersTablespoon to ML
Tablespoon to ML with an instant result. ML = Tablespoon × 14.78676478125. Uses US customary cooking measures.
Unit ConvertersTeaspoon to ML
Teaspoon to ML with an instant result. ML = Teaspoon × 4.92892159375. Uses US customary cooking measures.
Unit ConvertersKM/H to MPH
KM/H to MPH with an instant result. MPH = KM/H × 0.621371192237334.
Unit ConvertersMPH to KM/H
MPH to KM/H with an instant result. KM/H = MPH × 1.609344.
Unit ConvertersKB to MB
KB to MB with an instant result. MB = KB × 0.001. Decimal units: 1 KB = 1,000 bytes.
Unit ConvertersMB to GB
MB to GB with an instant result. GB = MB × 0.001. Decimal units: 1 KB = 1,000 bytes.
Unit ConvertersGB to TB
GB to TB with an instant result. TB = GB × 0.001. Decimal units: 1 KB = 1,000 bytes.
Unit ConvertersBytes to KB
Bytes to KB with an instant result. KB = Bytes × 0.001. Decimal units: 1 KB = 1,000 bytes.
Unit ConvertersGaj to Square Feet
Gaj to Square Feet with an instant result. Square Feet = Gaj × 9.
Unit ConvertersSquare Feet to Gaj
Square Feet to Gaj with an instant result. Gaj = Square Feet × 0.1111111111111111.
Unit ConvertersGuntha to Square Feet
Guntha to Square Feet with an instant result. Square Feet = Guntha × 1089.
Unit ConvertersSquare Feet to Guntha
Square Feet to Guntha with an instant result. Guntha = Square Feet × 0.0009182736455463728.
Unit ConvertersCent to Square Feet
Cent to Square Feet with an instant result. Square Feet = Cent × 435.6.
Unit ConvertersDecimal to Square Feet
Decimal to Square Feet with an instant result. Square Feet = Decimal × 435.6.
Unit ConvertersAcre to Gaj
Acre to Gaj with an instant result. Gaj = Acre × 4840.
Unit ConvertersSquare Yard to Gaj
Square Yard to Gaj with an instant result. Gaj = Square Yard × 1.
Unit ConvertersCrore to Million
Crore to Million with an instant result. Million = Crore × 10.
Unit ConvertersMillion to Crore
Million to Crore with an instant result. Crore = Million × 0.1.
Unit ConvertersLakh to Crore
Lakh to Crore with an instant result. Crore = Lakh × 0.01.
Unit ConvertersDegrees to Radians
Degrees to Radians with an instant result. Radians = Degrees × 0.017453292519943295.
Unit ConvertersRadians to Degrees
Radians to Degrees with an instant result. Degrees = Radians × 57.29577951308232.
Unit ConvertersCelsius to Fahrenheit
Celsius to Fahrenheit with an instant result. °F = °C × 9/5 + 32.
Unit ConvertersFahrenheit to Celsius
Fahrenheit to Celsius with an instant result. °C = (°F − 32) × 5/9.
Unit ConvertersCelsius to Kelvin
Celsius to Kelvin with an instant result. K = °C + 273.15.
Unit ConvertersKelvin to Celsius
Kelvin to Celsius with an instant result. °C = K − 273.15.
Unit ConvertersDate Difference Calculator
Date Difference Calculator with an instant result. Elapsed days between two dates, excluding the end date. Uses UTC calendar arithmetic.
Date & TimeAge Calculator
Age Calculator with an instant result. Completed years, months and days at your chosen date. End-of-month anniversaries are clamped to the last valid day.
Date & TimeAdd Days to Date
Add Days to Date with an instant result. Add signed whole calendar days to a date.
Date & TimeDay of Week Finder
Day of Week Finder with an instant result. Find the weekday for a Gregorian calendar date.
Date & TimeWeek Number Calculator
Week Number Calculator with an instant result. ISO 8601 week number: weeks start Monday and week 1 contains January 4.
Date & TimeBusiness Days Calculator
Business Days Calculator with an instant result. Count Monday–Friday dates in the half-open interval [start, end). Public holidays are not included.
Date & TimeUnix Timestamp Converter
Unix Timestamp Converter with an instant result. Convert Unix seconds (not milliseconds) into an ISO 8601 UTC datetime.
Date & TimeISO Date Converter
ISO Date Converter with an instant result. Convert an ISO datetime with explicit offset or Z into Unix seconds and normalized UTC.
Date & TimeTime Duration Calculator
Time Duration Calculator with an instant result. Add durations. Hours can exceed 24; minutes must be 0–59.
Date & TimePAN Format Checker
PAN Format Checker with an instant result. Checks structure only; does not verify issuance or identity.
India UtilitiesGST Number Format Checker
GST Number Format Checker with an instant result. Checks structure only; does not verify checksum, registration or status.
India UtilitiesIFSC Format Checker
IFSC Format Checker with an instant result. Checks structure only; does not verify branch existence.
India UtilitiesPincode Formatter
Pincode Formatter with an instant result. Checks a six-digit Indian PIN format; does not locate a post office.
India UtilitiesAadhaar Masking Tool
Aadhaar Masking Tool with an instant result. Show only the last four digits. Does not validate Aadhaar or save the input.
India UtilitiesIndian Mobile Number Formatter
Indian Mobile Number Formatter with an instant result. Normalize a 10-digit Indian mobile number beginning 6–9 to +91 format. Format check only.
India UtilitiesIndian Currency Formatter
Indian Currency Formatter with an instant result. Format an amount using Indian digit grouping and the rupee symbol.
India UtilitiesRupees to Words
Rupees to Words with an instant result. Write up to 999,999,999 rupees in Indian English with paise rounded to two decimal places.
India UtilitiesFinancial Year Calculator
Financial Year Calculator with an instant result. Indian financial years run from April 1 through March 31.
India UtilitiesFuel Cost Calculator
Fuel Cost Calculator with an instant result. Fuel cost = distance ÷ mileage × fuel price.
Home & EverydayMileage Calculator
Mileage Calculator with an instant result. Mileage = distance ÷ fuel used, in km/liter.
Home & EverydayTravel Time Calculator
Travel Time Calculator with an instant result. Travel time in hours = distance ÷ average speed. Stops are not included.
Home & EverydayEV Charging Cost
EV Charging Cost with an instant result. Battery capacity × charge fraction ÷ efficiency × electricity price.
Home & EverydayEV Range Calculator
EV Range Calculator with an instant result. Estimated range = energy ÷ consumption × 100. Actual conditions vary.
Home & EverydayAppliance Electricity Cost
Appliance Electricity Cost with an instant result. watts ÷ 1000 × hours/day × days × price/kWh. Excludes fixed charges, taxes and tariff slabs.
Home & EverydayWatt to Unit Calculator
Watt to Unit Calculator with an instant result. Energy in kWh (units) = watts × hours ÷ 1000.
Home & EverydayBattery Backup Calculator
Battery Backup Calculator with an instant result. Estimated runtime in hours = voltage × Ah × usable efficiency ÷ load. Battery chemistry and discharge limits affect actual results.
Home & EverydayWater Tank Volume
Water Tank Volume with an instant result. Rectangular tank volume in liters = length × width × height × 1000.
Home & EverydayConcrete Volume Calculator
Concrete Volume Calculator with an instant result. Concrete volume in cubic meters = length × width × depth. Does not specify structural mix design.
Home & EverydayTile Calculator
Tile Calculator with an instant result. Tiles needed = ceiling(floor area ÷ tile area × (1 + wastage)).
Home & EverydayPaint Calculator
Paint Calculator with an instant result. Liters = area × coats ÷ coverage. Use the paint manufacturer’s coverage rate.
Home & EverydayFlooring Cost
Flooring Cost with an instant result. Total = area × (material rate + installation rate). Use consistent area units.
Home & EverydayRecipe Scaling Calculator
Recipe Scaling Calculator with an instant result. Scaled quantity = ingredient amount × desired servings ÷ original servings. Keep the same ingredient unit.
Home & EverydayRestaurant Bill Splitter
Restaurant Bill Splitter with an instant result. Per-person share = bill × (1 + tip ÷ 100) ÷ people.
Home & EverydayTip Calculator India
Tip Calculator India with an instant result. Optional tip = bill × tip percentage ÷ 100. No service charge or tax is inferred.
Home & EverydayEvent Seating Calculator
Event Seating Calculator with an instant result. Tables needed = ceiling(guests ÷ seats per table).
Home & EverydayTrip Budget Calculator
Trip Budget Calculator with an instant result. Trip budget = daily spending × days + fixed costs.
Home & EverydayHosting Cost Calculator
Hosting Cost Calculator with an instant result. Annual running cost = monthly hosting × 12 + domain renewal + other annual costs.
Home & EverydayWebsite Bandwidth Calculator
Website Bandwidth Calculator with an instant result. Estimated monthly bandwidth (decimal GB) = MB per page × page views ÷ 1000. Excludes caching and non-page traffic.
Home & EverydayImage Compression Savings Calculator
Image Compression Savings Calculator with an instant result. Savings percentage = (original − compressed) ÷ original × 100. Negative values indicate a larger output.
Home & EverydayPace Calculator
Pace Calculator with an instant result. Pace = time ÷ distance, expressed in minutes per kilometer.
Home & EverydayBasic Calculator
Basic Calculator with an instant result. Evaluate one arithmetic operation. Expressions are never executed as code.
Math & NumbersScientific Calculator
Scientific Calculator with an instant result. Apply one mathematical function. Trig input and inverse-trig output use your chosen angle unit. Natural logarithms use base e.
Math & NumbersFraction Calculator
Fraction Calculator with an instant result. Add, subtract, multiply or divide two signed integer fractions, then reduce the result.
Math & NumbersRatio Calculator
Ratio Calculator with an instant result. Solve a:b = c:x. The known first part must be nonzero.
Math & NumbersPolygon Calculator
Polygon Calculator with an instant result. For a regular polygon: perimeter = n × s; area = n × s² ÷ (4 × tan(π/n)). All sides and angles must be equal.
Math & NumbersMonths Between Dates
Months Between Dates with an instant result. Completed calendar months. An incomplete final month does not count.
Date & TimeYears Between Dates
Years Between Dates with an instant result. Completed calendar years, based on whether the month/day anniversary has passed. February 29 anniversaries occur on March 1 in non-leap years.
Date & TimeHoliday Excluding Calculator
Holiday Excluding Calculator with an instant result. Count Monday–Friday dates in [start, end), excluding your supplied holiday list. No official holiday calendar is assumed.
Date & TimeTimezone Converter
Timezone Converter with an instant result. Convert an ISO datetime with explicit offset to an IANA timezone using the browser’s timezone database. Include Z or a numeric offset in the input.
Date & TimeTimezone Offset Calculator
Timezone Offset Calculator with an instant result. Difference = second offset − first offset. Enter fixed signed UTC offsets, not timezone names; seasonal changes are not inferred.
Date & TimeMinutes Between Times
Minutes Between Times with an instant result. Elapsed minutes; an end before start means the following day.
Date & TimeHours Between Times
Hours Between Times with an instant result. Elapsed decimal hours; an end before start means the following day.
Date & TimeTime Subtraction
Time Subtraction with an instant result. Subtract durations. Hours can exceed 24. A negative result means the second duration was longer.
Date & TimePomodoro Timer
Pomodoro Timer with an instant result. A local timer with start, pause and reset. Elapsed time is based on the device clock, so background timer throttling does not accumulate drift. No notification permission is needed.
Date & TimeCountdown Timer
Countdown Timer with an instant result. A local timer with start, pause and reset. Elapsed time is based on the device clock, so background timer throttling does not accumulate drift. No notification permission is needed.
Date & Time