Everyday Calculators
Accurate, privacy-friendly calculators that work instantly on any device.
Date & Time
Age Calculator
Calculate precise age in years, months, and days. See your next birthday countdown.
Date Calculator
Find the difference between two dates or add days/weeks/months to a date.
Time Zone Converter
Easily convert meeting times between any two cities worldwide.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa.
Pomodoro Timer
Focused 25/5 productivity timer with sound alerts and a daily session counter.
Converters
Aspect Ratio
Calculate ratios for images and video. Resize dimensions while keeping ratio.
Unit Converter
Convert length, mass, temperature, area, volume, speed, and data units.
Binary & Hex
Translate text to binary, or convert numbers between Decimal, Hex, and Octal.
Currency Converter
Live exchange rates for 160+ world currencies — USD, EUR, GBP, INR, AED and more.
Stone, Kg & Pounds Converter NEW
UK weight conversion: stones, kilograms, pounds — adult and baby-weight tables, "X st Y lb" format.
Number to Words
Convert any number to words in Indian (Lakh, Crore) or International format.
Fuel Cost Calculator
Estimate trip fuel cost based on distance, mileage, and fuel price.
Text Tools ›
Word counter, case converter, password generator, slug generator, lorem ipsum, text diff and 6 more.
Developer Tools ›
JSON/XML/YAML converters, regex tester, JWT decoder, Base64, URL encoder, hash, UUID and more.
Image & File Tools ›
Image compressor, format converter, resizer, image-to-PDF, QR generator, barcode and more.
About Everyday Calculators
Everyday Calculators is a free collection of online tools designed for common tasks involving dates, times, conversions, and number systems. Every calculator runs entirely in your browser — no data is sent to any server, and no personal information is collected or stored. The tools work on desktops, tablets, and phones.
Available Tools
The collection includes eight calculators organized into two categories. The Date and Time tools cover age calculation, date differences, time zone conversion, and Unix timestamp translation. The Converter tools handle aspect ratio computation, unit conversion across seven measurement categories, number base conversion between decimal, binary, hexadecimal, and octal, and live currency exchange rates from the European Central Bank.
How to Use
Select any calculator from the grid above. Each tool page includes clear input labels, an explanation of the method used, at least one worked example, and a list of frequently asked questions. Results appear instantly and can be copied to your clipboard with one click.
How These Everyday Calculators Work
Every tool on this page is a self-contained static HTML and JavaScript page that runs entirely in your browser. There is no server-side processing, no account creation, and no input logging. When you type a date of birth into the Age Calculator, choose two cities in the Time Zone Converter, enter a fuel price into the Fuel Cost Calculator, or paste a number into the Number to Words tool, the math happens on your device using JavaScript. The Currency Converter is the only tool that fetches anything from the internet, and even then it only downloads a small public exchange-rate dataset; your input amount stays local.
The age, date, and timestamp tools rely on the JavaScript Date object, applied with manual day-difference logic to avoid floating-point drift across long time spans. Unit conversions use SI reference factors, base conversions handle integer arithmetic in pure JavaScript, and the aspect ratio tool uses the greatest-common-divisor algorithm to simplify width-to-height ratios.
Common Use Cases for Everyday Calculators
People reach for these tools for a wide range of daily tasks. Job seekers and HR teams use the Age Calculator to confirm exact age on application forms. Travellers and remote workers use the Time Zone Converter to schedule meetings without an off-by-one-hour mistake when daylight saving changes. Students convert kilograms to pounds or kilometres to miles in the Unit Converter for homework and lab reports. Designers use the Aspect Ratio Calculator to resize banners and thumbnails without distortion. Drivers use the Fuel Cost Calculator to compare highway routes and budget weekend trips, while accountants and Indian users use the Number to Words tool to write cheque amounts in Lakh and Crore format. Programmers use the Binary and Hex tool, the Timestamp Converter, and the linked Developer Tools to debug code, decode JWT tokens, and convert epoch values during the workday. Finally, the Pomodoro Timer keeps focus on a 25-and-5 cycle for studying or deep work without needing a separate app install.
Frequently Asked Questions
What everyday calculators are available on this page?
This collection includes the Age Calculator, Date Calculator, Time Zone Converter, Timestamp Converter, Pomodoro Timer, Aspect Ratio Calculator, Unit Converter, Binary and Hex Converter, Currency Converter, Number to Words tool, and Fuel Cost Calculator. There are also quick links to text tools, developer tools, and image and file tools for related daily tasks.
Can I calculate my exact age in years, months, and days?
Yes, the Age Calculator computes your exact age in years, months, days, hours, and minutes from your date of birth. It also shows your next birthday countdown, total days lived, and the day of the week you were born. All calculation happens locally in your browser, so your date of birth is never uploaded.
Does the currency converter use live exchange rates?
The Currency Converter fetches up-to-date reference exchange rates published by the European Central Bank and other reliable sources. Rates refresh frequently during business hours but can lag interbank market prices by a few minutes, and they do not include the spread your bank or card network may add. Use the result as a planning estimate, not as a quote for actual money transfer.
Can I convert meeting times across time zones?
Yes, the Time Zone Converter supports all major IANA time zones worldwide and automatically applies daylight saving rules. Enter a date and time in one city and instantly see the equivalent in another. The Timestamp Converter handles Unix epoch values for developers who need to translate machine timestamps to readable dates.
Are the unit conversions accurate enough for school and work?
Yes, the Unit Converter uses internationally standardized conversion factors from NIST and the International System of Units (SI) for length, mass, volume, temperature, speed, area, and digital data. Results are accurate to many decimal places, which is well beyond what most homework, recipe, or office tasks require.
How does the fuel cost calculator estimate trip cost?
The Fuel Cost Calculator multiplies your trip distance by the inverse of your vehicle's fuel economy and then by the local fuel price. So a 300 km trip in a car that does 15 km per litre at fuel priced at 100 per litre returns a fuel cost of 2,000. The tool supports both km/litre and miles per gallon, plus both metric and US gallon options for fuel price.
Can I use these everyday calculators on my phone?
Yes. Every calculator on this page is fully responsive and tested on phones, tablets, and desktop browsers. Inputs are large, results update instantly, and there is no app to install. The Pomodoro Timer can run in a background tab on most modern phones, and the Number to Words tool supports both Indian (Lakh, Crore) and International (Million, Billion) systems.
Is my data private when I use these calculators?
Yes. All calculations and conversions run locally in your browser. Dates of birth, fuel costs, currency amounts, and trip distances never leave your device. Nothing is uploaded to a server, logged in a database, or shared with third parties. The currency converter only fetches a small public exchange-rate dataset and does not transmit your input amount.