Small tools that save you time.
Calculate, convert, transform and solve everyday tasks in seconds. Free and no registration required.
Percentage Calculator
Work out a percentage of a number, a percentage share, or a percentage change.
Discount Calculator
See the final price after a discount and exactly how much you save.
VAT Calculator
Add VAT to a net price or remove it from a gross price, at any rate.
Age Calculator
Find your exact age in years, months and days — and your next birthday.
Days Between Dates
Count the days, weeks and months between any two dates.
Working Days Calculator
Count business days between two dates, skipping weekends and holidays.
Time Between Two Times
Work out the duration between two clock times, including overnight.
Work Hours Calculator
Add up a week of shifts with breaks — and optional pay.
Explore by Category
All categories →Nine categories covering everyday maths, dates, text, conversions, money, files, images and the home.
Calculators
Percentages, discounts, VAT, ratios and the everyday calculations people actually need.
14 toolsDate & Time
Age, dates, working days, hours and time calculations.
8 toolsText
Words, characters, lines, text cleaning and transformations.
8 toolsConverters
Length, weight, temperature, storage and other unit conversions.
6 toolsMoney
Prices, VAT, discounts, percentages and everyday financial calculations.
10 toolsFiles
File size, storage and format helpers. More file tools are on the way.
4 toolsImages
Image helpers that run locally in your browser — nothing is uploaded.
3 toolsHome
Household, renovation and materials calculators.
3 toolsUtilities
Useful odds and ends that do not belong anywhere else.
6 tools- How to Work Out VAT BackwardsAdding VAT is easy. Taking it off again is where almost everyone goes wrong, because the obvious move — subtracting the VAT rate — quietly gives the wrong number every single time.
- Percentage Points vs PercentIf an interest rate moves from 4% to 5%, has it gone up by 1% or by 25%? Both answers are defensible, they mean completely different things, and the ambiguity is exploited often enough that it is worth being able to spot.
- Counting Days and DeadlinesAlmost every dispute about a deadline comes down to one question that nobody asked at the start: does the first day count? Get that wrong and you are out by one, which is usually the difference between on time and late.
- Fuel Economy Units ExplainedFuel economy is quoted in at least three incompatible ways, two of them run in opposite directions, and the word "gallon" means two different volumes depending on which side of the Atlantic you are on.
All Tools
41 tools available right now. Filter by category or use the search box above.
Percentage Calculator
Work out a percentage of a number, a percentage share, or a percentage change.
Rule of Three Calculator
Solve simple proportions: if A gives B, what does C give?
Discount Calculator
See the final price after a discount and exactly how much you save.
VAT Calculator
Add VAT to a net price or remove it from a gross price, at any rate.
Price with VAT Calculator
Turn a net price into the final price your customer pays.
Price Before VAT Calculator
Work backwards from a price that already includes VAT.
Age Calculator
Find your exact age in years, months and days — and your next birthday.
Days Between Dates
Count the days, weeks and months between any two dates.
Working Days Calculator
Count business days between two dates, skipping weekends and holidays.
Date After X Days
Add or subtract days, weeks or months from a date.
Time Between Two Times
Work out the duration between two clock times, including overnight.
Work Hours Calculator
Add up a week of shifts with breaks — and optional pay.
Word Counter
Count words, characters, sentences and paragraphs as you type.
Character Counter
Count characters with and without spaces, against common limits.
Line Counter
Count total, non-empty, unique and duplicate lines in a list.
Reading Time Calculator
Estimate how long a text takes to read or to say out loud.
Remove Duplicate Lines
Clean a list by deleting repeated lines, keeping the order.
Sort Lines Alphabetically
Sort any list A–Z, Z–A, by number or by length.
Uppercase / Lowercase Converter
Change text to UPPERCASE, lowercase, Title Case and more.
Celsius to Fahrenheit
Convert temperatures between °C, °F and Kelvin, both ways.
Kilograms to Pounds
Convert kg to lb and back, with stones and ounces too.
Kilometers to Miles
Convert km to miles and back, with metres, feet and pace.
Centimeters to Inches
Convert cm to inches and back, with feet and inches for height.
MB to GB Converter
Convert between bytes, KB, MB, GB and TB — decimal or binary.
BMI Calculator
Work out your body mass index in metric or imperial units.
Tip Calculator
Work out the tip and split the bill between any number of people.
Loan Payment Calculator
Monthly payment, total interest and cost for any loan or mortgage.
Day of the Week
Find what day of the week any date falls on, past or future.
Random Number Generator
Pick random numbers in any range, with or without repeats.
Password Generator
Create strong random passwords that never leave your browser.
Paint Calculator
How much paint a room needs, including coats and openings.
Tile Calculator
How many tiles and boxes a floor or wall needs, with wastage.
Image Resizer
Resize and compress an image without uploading it anywhere.
Aspect Ratio Calculator
Resize width or height while keeping the same proportions.
Image to Base64
Turn an image into a data URI you can paste straight into code.
CSV to JSON Converter
Turn a CSV table into JSON, handling quotes and commas properly.
Wallpaper Calculator
How many rolls of wallpaper a room needs, pattern repeat included.
Time Zone Converter
Convert a time between cities, with daylight saving handled.
Roman Numeral Converter
Convert numbers to Roman numerals and back, both directions.
Unit Price Calculator
Compare package sizes and see which one is actually cheaper.
Fuel Cost Calculator
What a journey costs in fuel, split between passengers.
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Why Utilario
Most small tasks do not deserve an app, an account or a subscription. You need a number, a count or a converted value, and then you want to get on with your day. Utilario is built around that one idea: open the page, do the thing, leave.
Every tool here runs in your browser. Your text, your dates and your numbers stay on your device — nothing is uploaded, nothing is stored and no sign-up is ever requested. Pages are plain HTML with a few kilobytes of JavaScript, so they load quickly even on a slow connection.
New tools are added regularly. If something you use often is missing, tell us — the list is shaped by what people actually ask for.