LocalToolZ

Converter & Calculator

Converter & Calculator: Age Calculator, Percentage Calculator, BMI Calculator, Currency Converter, Loan Calculator. Free online tools that run entirely in your browser — no upload, 100% private.

Math & Calculator

Calorie Calculator Free calorie calculator. Find your BMR and daily calorie needs (TDEE), plus target calories for weight loss or gain with a protein, carb and fat breakdown - works offline in your browser. Math Expression Calculator Evaluate complex math expressions online with variables, 20+ functions, and real-time calculations. Perfect for algebra, trigonometry, and scientific computing. Arithmetic Sequence Calculator Calculate nth term, sum, and generate complete arithmetic sequences instantly. Free online tool with 100% privacy - all calculations happen locally in your browser. GCD/LCM Calculator Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers. Prime Number Checker Check if a number is prime instantly. Find prime factors, nearest primes, and the nth prime number online. Factorial Calculator Calculate n! instantly for any non-negative integer. Free online factorial calculator with BigInt support for arbitrarily large results. Fibonacci Generator Generate Fibonacci numbers and sequences instantly. Calculate the nth Fibonacci number or generate a full sequence with BigInt support for arbitrarily large numbers. Loan Calculator Calculate monthly loan payments, total interest, and view amortization schedule. Supports equal payment and equal principal methods for mortgages, auto loans, and personal loans. Discount Calculator Calculate discounted prices, savings, and final cost. Supports percentage and fixed amount discounts with tax. Tip Calculator Calculate tips instantly and split bills among friends. Free online tool with custom tip percentages. BMI Calculator Calculate your Body Mass Index (BMI) instantly with our free online calculator. Get your weight category, health guidance, and understand what your BMI means for your health. Percentage Calculator Free online percentage calculator. Calculate X% of Y, percentage change, and percentage increase/decrease instantly with formulas. Scientific Calculator Free online scientific calculator with trig, log, and exponential functions. Switch between degree and radian modes instantly. LaTeX Equation Editor Free online LaTeX equation editor with real-time KaTeX preview. Write, edit, and export math formulas instantly. Precise Age Calculator Calculate your exact age in years, months, days, hours, minutes and seconds with real-time counter. Discover your zodiac sign, Chinese zodiac animal, and countdown to next birthday. 100% private, runs entirely in your browser. Currency Converter Convert between 30+ currencies with real-time calculation and editable exchange rates. Free online currency converter. Periodic Table Interactive periodic table of all 118 elements with category colors, full data per element and a temperature slider that shows solid, liquid and gas phases from -273 to 6000 °C, running fully offline in your browser. Sudoku Play free sudoku online with five difficulty levels. Every puzzle has a unique solution, with notes, hints, undo and a timer - generated right in your browser. Statistics Calculator Free online statistics calculator: paste a list of numbers and get count, sum, mean, median, mode, sample and population variance and SD, CV, quartiles, skewness, kurtosis, a histogram and a box plot instantly. Matrix Calculator Free online matrix calculator: determinant, inverse, rank, trace, transpose, RREF and eigenvalues for matrices up to 6×6, plus A±B, A×B and B×A. Runs entirely in your browser. Graphing Calculator Free online graphing calculator: plot multiple functions, pan and zoom, trace coordinates and find intersections and extrema. Runs entirely in your browser.

Time & Date

Pregnancy Due Date Calculator Free pregnancy due date calculator. Estimate your due date from your last period, conception date, ultrasound or IVF transfer, and track gestational age, trimester and key milestone dates. Online Countdown Timer Free online countdown timer with alarm sound and presets. Set minutes and seconds, keep the screen awake and get notified when time is up - works in any browser. Online Stopwatch Free online stopwatch with millisecond precision, lap times and keyboard shortcuts. Start, pause and reset instantly - runs entirely in your browser, nothing to install. Precise Age Calculator Calculate your exact age in years, months, days, hours, minutes and seconds with real-time counter. Discover your zodiac sign, Chinese zodiac animal, and countdown to next birthday. 100% private, runs entirely in your browser. Roman Numeral Clock Live analog clock with Roman numeral face (I-XII), digital Roman time, Roman date display, 12/24h toggle, and number-to-Roman converter. Truncate Clock Time Batch truncate clock time and timestamps to hours, minutes, or seconds. Clean log files in-place. Free online tool, 100% browser-based, no upload. Leap Year Checker Check if any year is a leap year instantly with our free online tool. Supports batch checking multiple years at once. 100% private, runs entirely in your browser - no data sent to servers. Hours to Days Converter Convert hours to days instantly. Free online time converter with decimal support. 100% browser-based, fast and private. Time to Decimal Converter Convert HH:MM:SS time to decimal hours instantly. Free online tool, no signup required. Time to Seconds Converter Convert time formats like HH:MM:SS, 1h30m, 2d to total seconds instantly. Free online calculator with live results. Seconds to Time Converter Instantly convert seconds to days, hours, minutes and seconds. Free online duration calculator with real-time results. Discord Timestamp Generator Generate Discord timestamp tags in all 8 formats: short time, long time, short date, long date, relative time and more. Free online tool with timezone support. Calendar Generator Create printable monthly and yearly calendars with custom events, week numbers, and holiday highlights. Free online calendar maker with PNG export. Crontab Guru Parse and explain cron expressions. Shows human-readable schedule description and next execution times. Crontab Generator Generate and validate cron expressions with instant human-readable explanations. Visualize schedules, preview next execution times, and export to crontab format. Perfect for Linux/Unix system administrators. Age Calculator Calculate your exact age in years, months, days, hours, minutes and seconds. Free online age calculator with birthday countdown. Time Between Dates Calculate the exact time difference between two dates in days, hours, minutes and seconds. Free online date duration calculator — fast, accurate, and runs entirely in your browser. Unix Timestamp to Date Converter Convert Unix timestamps to human-readable dates instantly. Real-time ticker, seconds/milliseconds support, and detailed date breakdowns. 100% browser-based. Timezone Converter Free online timezone converter. Convert time between any zones, check world clock, calculate time differences instantly. Days to Hours Converter Convert days to hours instantly. Multiply by 24 for quick, accurate results. Free online tool, 100% browser-based, no data sent to servers. Interval Timer Free interval timer for HIIT, Tabata and circuit training. Configure prepare, work, rest and between-set phases with beep cues and an optional voice countdown. Total time estimate and one-tap presets. Pomodoro Timer Free online pomodoro timer. Classic 25/5 focus sessions with short and long breaks, adjustable rounds, daily pomodoro counter, completion sound and optional notifications. No install. World Clock Free online world clock. Current time in 95+ cities worldwide with local time zone offsets, dates and daylight saving handled automatically. Search, 12/24 hour, zero install. Qibla Compass Free online qibla compass. Find the exact direction to the Kaaba from any location with great-circle bearing, live compass alignment and turn guide. 100% local. Prayer Times Free online prayer times for 115+ world cities: Fajr, Dhuhr, Asr, Maghrib and Isha with ten calculation methods, Asr school and next-prayer countdown. Local. Hijri Converter Free Hijri calendar converter. Convert Gregorian dates to the Islamic Umm al-Qura calendar and back, with localized month names, weekday and ±2-day adjustment. Online Alarm Clock Free online alarm clock with a big live clock, multiple alarms, three ring tones and a 5 minute snooze. Set it in seconds - no app install needed. Persian Date Converter Convert any date between the Gregorian and Persian (Solar Hijri, Jalali) calendars instantly, with localized month names, weekday display, a today button and day stepping. Runs fully in your browser. Hebrew Date Converter Convert any date between the Gregorian and Hebrew (Jewish) calendars instantly, with localized Hebrew month names, weekday display, a today button and day stepping. Runs fully in your browser. Chess Clock Free online chess clock with Fischer increment. Presets from 1+0 bullet to 15+10 rapid, custom time, tap to switch sides, pause, swap and spacebar support — runs entirely in your browser. Moon Phase Calendar Moon phase for any date with a month of mini icons, illumination percent, moon age and the next key phases. Dice Roller Roll dice online with real RPG notation: 2d6+3, d20, 4d6kh3 and more. Quick buttons for d4 to d100, a quantity stepper, a big result display with CSS pips for d6, and a history list with a grand total — all running locally in your browser. Coin Flip Flip a fair coin online with a smooth 3D animation. Flip once for quick decisions or run 5, 10, 50 or 100 flips at once, with live heads and tails counts, percentages and a one-tap reset, all stored locally in your browser. Number Memory Test Free online number memory test: memorize the number that flashes for two to three seconds, type it back, and grow one digit per level with three lives; your best is saved in your browser. Visual Memory Test Free online visual memory test: white tiles flash for one second, tap every one you saw, all correct levels you up while the grid grows from 3×3 to 5×5 and three misses end the run. Sequence Memory Test Free online sequence memory test: watch the pattern flash tile by tile on a 3×3 grid, repeat it in order and grow one step per round while the flashing speeds up; your best level stays in your browser. Click Speed Test Free CPS test online. Pick 1, 5, 10 or 60 seconds, click as fast as you can and get your clicks-per-second score, a fun rank and personal bests for every mode, saved in your browser. Chimp Test Free online chimp test: memorize where the numbers sit, tap them in ascending order once they hide and climb from a 4×2 grid up to 8×6 with one extra number every round. Aim Trainer Free online aim trainer. Targets pop up one after another in 15/30/60 second rounds with three target sizes. Tracks hits, accuracy, average time per hit and fastest click, all in your browser. Reaction Time Test Free online reaction time test. Click when the box turns green, five attempts per round with average, best and worst, plus an all-time record saved in your browser.

Unit Converter

Coordinate Format Converter Convert GPS coordinates between decimal degrees, DMS, DDM and GeoJSON instantly. Auto-detects the input format, handles N/S/E/W hemispheres, and exports batches as CSV — fully offline in your browser. Number Formatter Format numbers with thousands separators, decimal places, prefixes, and suffixes. Convert numbers to words in multiple languages instantly. Data Storage Converter Instantly convert between bytes, KB, MB, GB, TB, PB, bits, KiB, MiB, GiB. Supports decimal (SI) and binary (IEC) systems. Free, private & accurate. Color Converter Free online color converter. Convert HEX, RGB, HSL, HSV formats instantly with visual picker. 100% private, runs in your browser. Energy Converter Convert between Joule, Kilojoule, Calorie, Kilocalorie, Watt-hour, Kilowatt-hour, BTU, Electronvolt, and Foot-pound instantly. Frequency Converter Convert between Hz, kHz, MHz, GHz, THz, RPM, rad/s, BPM instantly. Free online frequency converter with real-time results. Angle Converter Convert between angle units: degree, radian, gradian, arcminute, arcsecond, revolution, milliradian, microradian. Pressure Converter Free online pressure converter. Instantly convert between Pa, kPa, MPa, bar, atm, PSI, Torr, mmHg and inHg with real-time calculations. Days to Hours Converter Convert days to hours instantly. Multiply by 24 for quick, accurate results. Free online tool, 100% browser-based, no data sent to servers. Currency Converter Convert between 30+ currencies with real-time calculation and editable exchange rates. Free online currency converter. Area Converter Convert between area units: square meter, square kilometer, hectare, acre, mu, qing, are, tsubo, square mile, square foot, and more. Volume Converter Free online volume unit converter. Instantly convert between liters, milliliters, gallons, cups, fluid ounces, cubic meters and more with high precision. Byte Converter Convert between digital storage units — B, KB, MB, GB, TB, PB, EB. Supports both 1000 and 1024 bases. Speed Converter Free online speed converter. Instantly convert km/h, mph, m/s, knots, ft/s, mach with real-time calculations. Temperature Converter Convert between Celsius, Fahrenheit, and Kelvin instantly. Free online temperature converter with formulas and reference points. Weight Converter Convert between kilograms, grams, pounds, ounces, tons, stones and more weight units instantly. Length Converter Convert between meters, kilometers, miles, yards, feet, inches, centimeters, millimeters, and nautical miles instantly with this free online length converter.

Number

Roman Numeral Converter Free online Roman numeral converter. Instantly convert Arabic numbers (1-3999) to Roman numerals and vice versa. No registration required. Random Number Generator Generate random numbers instantly within any range. Supports integers, decimals, unique values, and sorting. Free online tool that runs entirely in your browser. Number Spell Out Convert numbers to English words, Chinese uppercase, Roman numerals, and scientific notation instantly. Number Sum Sum numbers from text. Calculate total, average, min, max and count. Free online tool, runs in your browser. Number Generator Generate arithmetic number sequences with custom start value, step size, and count. Free, instant, and runs entirely in your browser — no sign-up required. Number Base Converter Convert numbers between binary, octal, decimal, and hexadecimal instantly. Supports custom bases from 2 to 36. Roman Numeral Clock Live analog clock with Roman numeral face (I-XII), digital Roman time, Roman date display, 12/24h toggle, and number-to-Roman converter. Number Formatter Format numbers with thousands separators, decimal places, prefixes, and suffixes. Convert numbers to words in multiple languages instantly. Phone Number Validator Validate phone numbers offline with Google libphonenumber metadata: E.164, international and national formats, mobile or fixed line type, country and dial code. Batch mode with CSV export — everything runs locally in your browser.