Fast online calculators and everyday tools.

WeUtils.uk keeps common calculations simple: no sign-up, no clutter, just quick answers on any device.

Convert currencies with live exchange rates. Free, fast and clutter-free converter.

Discount Calculator

Calculate final price and savings after applying single or multiple discounts instantly.

Reverse VAT calculator

Remove VAT from a gross amount and calculate net amount and VAT value instantly.

VAT calculator

Calculate VAT, net amount and gross total instantly.

Tip calculator

Work out the tip and split the total per person instantly.

Loan calculator

Loan payment calculator: work out your monthly payment, total interest and total cost from the amount, rate and term.

Interest rate calculator

Interest rate calculator: find the annual interest rate of a loan from the amount, monthly payment and term. Free, no sign-up.

Compound interest calculator

See how your savings grow with compound interest and monthly contributions.

Mortgage calculator

Estimate your monthly mortgage payment with interest, property tax, insurance and a full amortization chart.

Gross to net salary calculator

Convert a gross salary to net take-home pay after income tax and social security.

Net to gross salary calculator

Work out the gross salary needed for a target net pay after deductions.

Break-even calculator

Work out the break-even point: how many units to sell to cover costs, plus the break-even revenue.

Date & time

Age calculator

Calculate current age from a date of birth.

Date difference calculator

Calculate days and approximate months between two dates.

Day of the week calculator

Find out what day of the week you were born and your exact age.

Age difference calculator

Work out the exact age gap between two people in years, months and days.

Time zone converter

Convert a time between time zones and see the current time around the world. Plan meetings across countries.

Unix timestamp converter

Convert a Unix timestamp to a date and back, with UTC and ISO output.

Business days calculator

Count the working days (Monday to Friday) between two dates, excluding weekends. Instantly.

Countdown timer

Live countdown to a date and time: days, hours, minutes and seconds. No sign-up.

Duration calculator

Work out how long between two times (even across midnight): hours and minutes. Instantly.

Math

Percentage calculator

Calculate what percentage one number is of another.

Random number generator

Generate random numbers within a range, instantly and locally.

GCD and LCM calculator

Find the GCD and LCM of two or more numbers instantly.

Prime number checker

Check if a number is prime and see its prime factors.

Factorial calculator

Calculate the factorial (n!) of a number, exact for large values.

Binary / decimal / hex converter

Convert numbers between binary, decimal, hexadecimal and octal.

Scientific calculator

Scientific calculator: trigonometry, logarithms, roots, powers, π and e. Type the expression and get the result.

Rule of three calculator

Solve direct and inverse proportions instantly. Enter three values and get the fourth.

Dice roller

Roll dice online: choose how many dice and how many faces (d4, d6, d8, d10, d12, d20, d100).

Flower petal calculator

Find the typical number of petals of common flowers and see how petal counts follow the Fibonacci sequence.

Text

Word Counter

Count words, characters, sentences, paragraphs, and check reading times in real-time.

Case converter

Convert text to uppercase, lowercase, title case or sentence case instantly.

Regex tester

Test regular expressions against your text and see live matches.

Lorem Ipsum generator

Generate Lorem Ipsum placeholder text by paragraphs, instantly and ready to copy. Perfect for mockups and design.

Palindrome checker

Check whether a word or phrase is a palindrome (reads the same backwards), ignoring spaces, case and accents.

Text to speech

Turn text into speech with your browser’s synthesis: pick a voice and language and adjust the speed. Free and local.

Developer

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to plain text online and locally.

JSON Formatter

Format, validate, prettify, and minify your JSON data in real-time in your browser.

Password Generator

Generate secure, random passwords with custom length and character sets instantly in your browser.

QR Code Generator

Create custom, downloadable QR codes for URLs, text, Wi-Fi or email instantly.

UUID Generator

Generate single or bulk secure RFC4122 version 4 UUIDs instantly in your browser.

URL encoder / decoder

Encode or decode URLs and query strings (percent-encoding) instantly.

Hash generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes of any text locally.

HTML entity encoder / decoder

Encode text to HTML entities or decode entities to plain text.

Slug generator

Turn any title into a clean URL slug: lowercase, no accents, hyphenated. Instantly in your browser.

Font size converter

Convert font sizes between px, em, rem and pt with a configurable base size. For CSS and design.

CSS minifier

Minify CSS by removing comments and whitespace to shrink the file size. Local and instant.

CSS gradient generator

Create linear CSS gradients from two colors and an angle, with a live preview and code to copy.

What is my screen resolution

Shows your screen resolution, viewport, pixel ratio and color depth for your device.

Converters

cm to pixels calculator

Calculate how many pixels you need for a final size in cm or inches at any PPI/DPI, with aspect ratio checks for photo printing.

Pixel to cm converter

Convert image pixels to cm, mm or inches using PPI/DPI. Select an image locally to read dimensions without uploading it.

Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin instantly.

Color converter

Convert colors between HEX, RGB and HSL instantly with a live picker.

Length converter

Length converter (cm, m, inches, feet, miles). online converter.

Weight converter

Weight converter (kg, g, pounds, ounces, stone). online converter.

Volume converter

Volume converter (litres, mL, gallons, cups, pints). online converter.

Speed converter

Speed converter (km/h, mph, m/s, knots). online converter.

Area converter

Area converter (m², ft², acres, hectares). online converter.

Aspect ratio calculator

Work out the aspect ratio (16:9, 4:3…) from a width and height in pixels. Instantly.

Energy converter

Convert energy between joules, kilojoules, calories, kilocalories, watt-hours, kWh and BTU. Instantly.

DPI / PPI calculator

Work out DPI/PPI from pixels and physical size, and check whether the resolution is good enough to print.

Image resize calculator

Work out the new width or height while keeping the image’s aspect ratio, plus the scale in %. Instantly.

Health

BMI Calculator

Calculate your Body Mass Index (BMI) instantly and check WHO categories.

BMR calculator

Work out your basal metabolic rate (BMR) with the Mifflin-St Jeor formula: the calories you burn at rest.

Daily calorie calculator

Work out the calories you need per day from your metabolism and activity, with goals to maintain, lose or gain weight.

Daily water intake calculator

Work out how much water to drink per day from your weight (litres and glasses). A quick, simple guide.

Pregnancy due date calculator

Work out your estimated due date from your last period (Naegele’s rule), with gestational age and trimester.