Tool directory
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Browse 111 calculators, converters, and practical browser tools.20 tools
Math & Numbers
Binary ConverterConvert integers between binary, decimal, hexadecimal, and any base from 2 to 36.›Hex ConverterConvert hexadecimal values to binary, decimal, or another number base.›Binary TranslatorTranslate UTF-8 text to 8-bit binary bytes or decode binary bytes back to text.›Decimal to BinaryConvert a decimal whole number to binary.›Binary to DecimalConvert a binary whole number to decimal.›Hex to DecimalConvert hexadecimal digits to a decimal integer.›Decimal to HexConvert a decimal integer to hexadecimal.›Binary to HexConvert binary digits to hexadecimal.›Hex to BinaryConvert hexadecimal digits to binary.›Percentage CalculatorCalculate a percentage of a number, a percentage ratio, or a percentage increase.›Fraction CalculatorAdd, subtract, multiply, or divide two fractions and simplify the result.›Scientific CalculatorEvaluate arithmetic, powers, roots, logarithms, and trigonometric functions safely.›Average CalculatorFind the arithmetic mean, sum, minimum, maximum, and count of a number list.›Standard DeviationCalculate sample or population standard deviation, variance, and mean.›Prime CheckerCheck whether a safe whole number is prime and identify its status.›GCD CalculatorFind the greatest common divisor of two whole numbers using Euclid’s algorithm.›LCM CalculatorFind the smallest non-negative multiple shared by two whole numbers.›Log CalculatorCalculate logarithms using base 10, base e, base 2, or a custom positive base.›Exponent CalculatorRaise a base to any real exponent and review the calculated power.›Root CalculatorCalculate square roots, cube roots, or any real nth root.›
21 tools
Unit Converters
CM to InchesConvert centimeters to inches using the exact international inch definition.›Inches to CMConvert inches to centimeters accurately.›MM to InchesConvert millimeters to inches.›Inches to MMConvert inches to millimeters.›Feet to MetersConvert feet to meters using the exact international foot.›Meters to FeetConvert meters to feet.›Pounds to KGConvert avoirdupois pounds to kilograms.›KG to PoundsConvert kilograms to avoirdupois pounds.›Celsius to FahrenheitConvert degrees Celsius to degrees Fahrenheit.›Fahrenheit to CelsiusConvert degrees Fahrenheit to degrees Celsius.›KM to MilesConvert kilometers to statute miles.›Miles to KMConvert statute miles to kilometers.›Grams to OuncesConvert grams to avoirdupois ounces.›Ounces to GramsConvert avoirdupois ounces to grams.›Liters to GallonsConvert liters to US liquid gallons without confusing Imperial gallons.›Gallons to LitersConvert US liquid gallons to liters.›Meters to YardsConvert meters to international yards.›Yards to MetersConvert international yards to meters.›Number to WordsWrite a whole number in clear international English words.›Roman NumeralsConvert whole numbers from 1 to 3,999 into standard Roman numerals.›Universal ConverterSearch and instantly convert length, mass, temperature, area, volume, speed, energy, and pressure units.›
10 tools
Date & Time
StopwatchRun a precise browser stopwatch with pause, resume, reset, and lap recording.›Countdown TimerRun a countdown with hours, minutes, seconds, pause, and audible completion.›Alarm ClockSet a local browser alarm for a selected time today or tomorrow.›Time Zone ConverterConvert a wall-clock date and time between IANA time zones with daylight-saving rules.›Age CalculatorCalculate calendar age, total days, and the next birthday from a birth date.›Date DifferenceFind the exact number of calendar days and whole weeks between two dates.›Add or Subtract DaysAdd or subtract whole calendar days from a date and see the resulting weekday.›Business DaysCount Monday-to-Friday business days between dates and optionally exclude your own holidays.›Time DurationCalculate hours and minutes between two clock times, including overnight spans.›Meeting PlannerPlan one meeting across multiple IANA time zones with current daylight-saving rules.›
8 tools
Everyday Money
Mortgage CalculatorEstimate US, UK, or general EU mortgage payments, entered fees, interest, and cash outlay.›Compound InterestProject compound growth with optional end-of-period contributions.›Income Tax 2026Estimate 2026 US federal income tax using filing status and the standard deduction.›Tip CalculatorCalculate a tip, total bill, and per-person split using your chosen percentage.›Discount CalculatorCalculate savings, the discounted price, optional sales tax, and the final checkout amount.›VAT CalculatorAdd VAT to a net amount or extract VAT from a tax-inclusive gross amount.›Sales TaxAdd a user-entered sales-tax rate or extract tax from a tax-inclusive total.›Loan PaymentEstimate the monthly payment, total interest, and total repaid for a fixed-rate amortizing loan.›
20 tools
Electrical
Ohm’s LawCalculate voltage, current, resistance, and power from two known electrical values.›Amps to WattsConvert current to real power using voltage, phase, and power factor.›Watts to AmpsConvert real power to current using voltage, phase, and power factor.›Amps to kWConvert amperes to kilowatts for single-phase or three-phase AC.›kW to AmpsConvert kilowatts to amperes using voltage, phase, and power factor.›kW to kWhConvert power and operating time into electrical energy.›kWh to kWFind average power from electrical energy and elapsed time.›Volts to WattsCalculate real power from voltage, current, phase, and power factor.›Watts to VoltsCalculate required voltage from power, current, phase, and power factor.›HP to kWConvert mechanical horsepower to kilowatts.›kW to HPConvert kilowatts to mechanical horsepower.›Wire SizeEstimate US AWG size or an IEC/UK–EU metric cross-section for voltage-drop planning.›Resistor Color CodeDecode four-band and five-band resistor color markings.›LED ResistorCalculate the resistance and minimum dissipation for LEDs connected in series.›Voltage DropEstimate voltage drop using US AWG/feet or IEC-style metric mm²/metres inputs.›Power FactorCalculate power factor from real power, voltage, current, and phase.›Energy ConsumptionEstimate daily, monthly, and annual kWh from appliance watts and operating time.›Electricity BillEstimate an electricity bill from usage, unit rate, fixed fees, and taxes.›Frequency to WavelengthConvert frequency to wavelength in vacuum, air, or a medium with a specified refractive index.›dBm to WattsConvert logarithmic dBm power to watts and milliwatts.›
20 tools
Developer Tools
RGB to HexConvert red, green, and blue channel values to a hexadecimal CSS color.›Hex to RGBConvert three- or six-digit hexadecimal colors to RGB channels.›RGB Color ChartBrowse and copy common CSS color names with RGB and hexadecimal values.›Base64 EncodeEncode UTF-8 text as Base64 without corrupting international characters.›Base64 DecodeDecode Base64 bytes as validated UTF-8 text.›URL EncodePercent-encode text for use as an individual URL component.›URL DecodeDecode percent-escaped URL component text.›ASCII TableSearch printable ASCII characters by decimal, hexadecimal, binary, or symbol.›HTML EditorEdit HTML, CSS, and JavaScript with an isolated live preview.›HTML ViewerRender an HTML snippet in a sandbox and inspect its plain source.›JSON FormatterValidate JSON and format it with readable indentation.›MD5 GeneratorGenerate an MD5 checksum for UTF-8 text in the browser.›SHA-256 GeneratorGenerate a SHA-256 digest for UTF-8 text using Web Crypto.›HTML EntitiesSearch and copy common named HTML character references.›CSS GradientBuild a two-color linear gradient and copy valid CSS.›Screen ResolutionInspect viewport, screen, pixel ratio, color depth, and orientation reported by the browser.›What Is My IPRequest the public IP address seen by an external IP lookup service.›User AgentView browser user-agent and platform information available to the page.›XML to JSONParse XML and convert elements, attributes, text, and repeated nodes to JSON.›JSON to XMLConvert JSON objects and arrays into escaped XML elements.›
12 tools
Health & Everyday
BMI CalculatorCalculate adult body mass index using metric or US customary measurements.›Grade CalculatorCalculate a weighted course grade from scores and category weights.›GPA CalculatorCalculate a credit-weighted GPA on a 4.0 scale.›Final GradeFind the score needed on remaining coursework to reach a target course grade.›Word CounterCount words, characters, sentences, paragraphs, and estimated reading time.›Line CounterCount total, non-empty, and unique lines in text.›Case ConverterConvert English text to upper, lower, title, sentence, camel, snake, or kebab case.›Online NotepadWrite notes that autosave only in this browser’s local storage.›Random NumberGenerate unique or repeated random integers within an inclusive range.›Due Date CalculatorEstimate a pregnancy due date from the last menstrual period or conception date.›Microphone TestTest microphone permission and live input level without recording or uploading audio.›Webcam TestPreview a selected camera locally and inspect the delivered video dimensions.›