Calculators – Free Browser-Based Calculators | HohoTools
Sometimes you need an answer now, and installing an app or opening a spreadsheet is more friction than the problem deserves. The calculators in this hub load instantly, run on any device, and compute everything locally in your browser — no value you type is transmitted or stored, so sensitive figures such as salary details, loan numbers or business costs stay on your screen. Each calculator focuses on a single everyday question and updates its result as you type, with sensible defaults so the first answer is already useful. Because the math runs on your device, the tools keep working on weak connections and stay snappy even on older hardware. They are free without limits: no account, no paywall in front of the result and no daily quota. Pick the calculator that matches your question below — each page documents the formula and assumptions behind it, so you can trust the numbers you get and check exactly how they were derived.
Age Calculator This free age calculator turns a date of birth into an exact age in years, months and days — with proper calendar borrowing, not a rough estimate. utility Average Calculator This free average calculator takes a list of numbers and gives you the four figures people actually need: the mean (arithmetic average), the median (the middle value once the list is sorted), the sum and the count. utility BMI Calculator This free BMI calculator converts your height and weight into Body Mass Index and the matching WHO weight category as you type, with a unit switch for metric (cm and kg) or imperial (feet plus inches and pounds) input. utility Celsius to Fahrenheit This free Celsius to Fahrenheit converter translates weather forecasts, oven dials, fever readings and thermostat settings between the two temperature scales people actually argue about. utility Celsius to Kelvin This free Celsius to Kelvin converter adds the exact offset 273.15 to any Celsius value and shows the kelvin result on every keystroke. utility CM to Feet This free cm to feet converter turns any centimeter value into feet the moment you type it, using the exact international definition: one foot is exactly 30.48 centimeters, fixed by the 1959 international yard and pound agreement. utility CM to Inches This free cm to inches converter turns any centimeter value into inches the moment you type it, using the exact internationally agreed factor: one inch is defined as exactly 2.54 centimeters, so the math is a single division by 2.54 with no rounding hidden inside. utility Compound Interest Calculator This free compound interest calculator shows what a lump sum turns into when interest itself starts earning interest — the effect Einstein allegedly called the eighth wonder of the world. utility Color Contrast Checker This free contrast checker measures any foreground/background color pair against the WCAG 2.x contrast formula and tells you instantly whether text in that combination passes accessibility thresholds. utility Countdown to Date Picking a launch date, an exam day, a wedding, a product release or the next holiday? utility Date Calculator This free date calculator covers the two date questions that come up constantly: how far apart are two dates, and what date is N days from now? utility Discount Calculator This free discount calculator answers the only two questions a sale tag raises: what does it cost now, and how much do I save. utility Fahrenheit to Celsius This free Fahrenheit to Celsius converter is the direction most of the world needs when meeting American numbers: a 75 °F weather forecast, an oven preheated to 350 °F, a fever of 100.4 °F, a freezer at 0 °F. utility Feet to CM This free feet to cm converter takes any length in feet and gives the centimeter value on every keystroke, multiplying by the exact factor 30.48. utility Feet to Inches This free feet to inches converter multiplies any foot value by exactly 12 and prints the inch result on every keystroke. utility Fraction Calculator Working with fractions by hand is where sign errors and forgotten simplifications creep in. utility Fuel Cost Calculator This free fuel cost calculator turns a trip plan into a number you can actually budget with. utility Grams to Ounces This free grams to ounces converter is aimed at the kitchen scale generation: recipes from American blogs written in ounces, coffee beans dosed in grams, sourdough hydration math, protein servings, jewellery weights and postal rates. utility HEX to RGB Converter This free HEX to RGB converter turns any hex color code into its red, green and blue channels the moment you type it. utility Inches to CM This free inches to cm converter multiplies any inch value by exactly 2.54 the moment you type it — no tables, no rounding guesswork. utility Inches to Feet This free inches to feet converter divides any inch value by exactly 12 and shows the feet result on every keystroke. utility JWT Decoder This free JWT decoder opens a JSON Web Token and shows you exactly what is inside: the header with its signing algorithm, the payload with its claims, and the signature — displayed but never verified. utility Kelvin to Celsius This free kelvin to Celsius converter subtracts the exact offset 273.15 from any kelvin value and shows the Celsius result on every keystroke. utility KG to LBS This free kg to lbs converter translates the kilogram-based numbers on luggage tags, gym plates, medical forms and product boxes into the pounds that US scales, baggage rules and workout plans speak. utility KG to Stone This free kg to stone converter turns any kilogram value into the stone readings used across the UK and Ireland for body weight, updating on every keystroke. utility KM to Miles This free km to miles converter reads the distances the metric world publishes and translates them for the mile world: road signs, marathon training plans, EV range figures, hiking trail lengths and flight connection distances. utility LBS to KG This free lbs to kg converter takes the pounds printed on American scales, workout programs, pet food bags and shipping labels and expresses them in the kilograms used by the metric world — medical charts, lifting standards, airline rules and science class among them. utility Liters to Gallons This free liters to gallons converter handles the liquid questions of everyday life: fuel economy quoted both ways, aquarium doses, camping water, paint coverage and recipe brines that cross the Atlantic. utility Liters to Milliliters This free liters to milliliters converter multiplies any liter value by exactly 1000 and shows the milliliter result on every keystroke. utility Loan Calculator This free loan calculator computes the monthly payment for a fixed-rate annuity loan — the standard structure for mortgages, car loans and personal loans where every payment is the same amount. utility Meters to Feet This free meters to feet converter handles the everyday vertical world: building heights, diving depths, ceiling dimensions, mountain elevations and room sizes listed in meters that need to make sense to anyone who thinks in feet. utility Meters to Yards This free meters to yards converter divides any meter value by the exact factor 0.9144 and shows the yard result on every keystroke. utility Miles to KM This free miles to km converter takes the distances written for the mile world — US road signs, race results in 26.2, car range stickers, trail guides — and expresses them in the kilometers your map, watch and legs actually understand. utility Milliliters to Liters This free milliliters to liters converter divides any milliliter value by exactly 1000 and shows the liter result on every keystroke. utility MM to Inches This free mm to inches converter is built for the small, exact measurements where a rounding error actually matters: camera sensor sizes, thread pitches, jewelry gauges, 3D-print tolerances and machining drawings. utility Pace Calculator This free pace calculator answers the two questions every runner asks: "what pace was that?" and "what finish time does this pace give me?". utility Percentage Calculator This free percentage calculator answers the three questions people actually ask about percentages, all in one place and all as you type. utility Random Number Generator This free random number generator produces truly unpredictable integers using your browser's cryptographic random source (crypto.getRandomValues) — the same class of randomness browsers use for security tokens, not a rough mathematical imitation of it. utility Ratio Calculator A proportion says two ratios are equal, and this free ratio calculator solves it for you: fill in any three of A, B, C and D in A:B = C:D, leave exactly one box empty, and the missing value appears instantly — together with the completed proportion so you can sanity-check it at a glance. utility RGB to HEX Converter This free RGB to HEX converter turns red, green and blue values into a hex color code the moment you type them. utility Sales Tax Calculator This free sales tax calculator handles both directions of the US-style tax math. utility Stone to Pounds This free stone to pounds converter multiplies any stone value by exactly 14 and shows the pound result on every keystroke. utility Online Stopwatch This free online stopwatch measures elapsed time with a big, easy-to-read display accurate to one hundredth of a second (10 ms). utility Text to Slug Converter This free slug converter turns any headline into a clean, SEO-friendly URL slug the moment you type it. utility Time Duration Calculator This free time duration calculator measures the gap between two moments and lays it out the way timesheets, logs and payroll actually need it. utility Online Timer This free online timer does one job well: you set a duration in minutes, press start, and it counts down to zero with a clear two-tone chime. utility Tip Calculator This free tip calculator settles the bill in three numbers: type the bill amount, the tip percentage and how many people are splitting, and it instantly shows the tip, the grand total and each person's share, rounded to cents. utility Unit Converter This free unit converter handles the six measurement families of everyday life: length, weight, area, volume, data size and temperature. utility URL Parser This free URL parser takes an address apart and shows every component on its own line: the protocol, the host, the explicit port (or the note that the default applies), the path, the query string and the hash fragment — plus the query parameters decoded into a readable key-value table. utility UUID Generator This free UUID generator produces random version-4 UUIDs in bulk, right in your browser. utility VAT Calculator This free VAT calculator does the two things invoices and receipts constantly demand: add VAT to a net price, and take a VAT-inclusive gross amount apart to see the net and the tax inside it. utility Yards to Meters This free yards to meters converter multiplies any yard value by the exact factor 0.9144 and shows the meter result on every keystroke. utility