WebTools

44 free tools

Everyday tools

Dates and ages, unit and land area conversions, home building estimates, text clean-up and image resizing.

By Nitin Raturi · Last reviewed

These tools answer the small, practical questions: how old, how many days, how many bricks, how big a file. Indian units such as bigha and tola are included.

Image and text tools work on your device; files are never uploaded. Building estimates name their assumptions, such as wastage, so you can adjust them.

Everyday 10

Grades and GPA, fuel and mileage, tips, unit prices, tyres and battery backup.

  • Aspect Ratio Calculator

    Find the aspect ratio of any width and height, and the matching height for a new width.

  • Fuel Cost Calculator

    Estimate the fuel cost of a drive from distance, mileage and your fuel price, with round trips, cost per km and a split.

  • Gas Mileage Calculator

    Work out fuel economy from a fill-up in km/L, L/100 km and mpg, with the cost per km.

  • GPA Calculator

    Calculate a credit-weighted semester GPA and optionally combine it with your previous GPA.

  • Grade Calculator

    Calculate a weighted course grade or find the final score needed to reach a target.

  • Horsepower Calculator

    Turn engine torque and rpm into kW, hp and PS, or find the torque behind a power figure.

  • Inverter Battery Backup Calculator

    Estimate how long an inverter battery lasts at your load, and the battery size for the backup you want.

  • Tip Calculator

    Work out a tip and split the bill equally, with an option to round each share up to the rupee.

  • Tyre Size Calculator

    Compare two tyre sizes: diameter, sidewall and how the speedometer reading changes.

  • Unit Price Calculator

    Compare two pack sizes by price per gram, ml or piece and see which is cheaper and by how much.

Utilities 3

A general financial calculator, a salary converter and random numbers.

  • Financial Calculator (TVM)

    Solve for future value, present value, payment, rate or number of periods from the other figures.

  • Random Number Generator

    Generate integers, fixed-precision decimals or picks from your own list.

  • Salary Calculator

    Convert gross pay between hourly, daily, weekly, monthly and annual amounts using your own work schedule.

Date & Time 8

Ages, date differences, working days, time sums and time zones.

  • Age Calculator

    Find an exact age in years, months and days on any date, with totals and a countdown to the next birthday.

  • Date Difference Calculator

    Find the years, months, weeks and days between two dates, with or without the end date.

  • Add/Subtract Dates Calculator

    Add or subtract years, months, weeks and days from a date, with the weekday shown.

  • Day of the Week Calculator

    Find the weekday, day of the year and ISO week number for any date from 1900 to 2100.

  • Hours Calculator

    Add up a week of shifts with breaks, night shifts, overtime and pay.

  • Time Calculator

    Add or subtract durations, or find the exact time between two clock readings.

  • Time Zone Converter

    Convert a date and time between IST and world time zones, with daylight saving and clock changes handled.

  • Working Days Calculator

    Count working days between two dates after weekends and your own holidays, including bank second and fourth Saturdays.

Converters 6

Units, land area, gold weight, Roman numerals and numbers in words.

  • Unit Converter

    Convert length, mass, volume, temperature and speed between metric, US and imperial units.

  • Land Area Converter

    Convert acres, hectares, square feet and gaj to bigha, kanal, marla, nali, guntha, cent and ground, with each state definition cited.

  • BTU Calculator

    Convert cooling and heating power between BTU per hour, watts, kilowatts, tons of refrigeration and kcal/h.

  • Gold Weight Converter

    Convert gold between grams, tola and troy ounces, and see the pure gold in each BIS hallmark grade.

  • Number to Words Converter

    Write any number or rupee amount in words, in lakh and crore or million and billion, with a cheque style.

  • Roman Numeral Converter

    Convert numbers from 1 to 3,999 into Roman numerals, or read a numeral as a number.

Construction 9

Bricks, concrete, tiles, paint, roofing, stairs, electricity use and wiring.

  • Electricity Calculator

    Estimate the units (kWh) an appliance uses and what it adds to your electricity bill.

  • Brick Calculator

    Estimate the bricks and wet mortar for a straight wall from its size, your brick size and joints.

  • Concrete Calculator

    Estimate concrete volume for rectangular pours and round columns, with optional wastage and material quantities.

  • Ohm’s Law Calculator

    Find voltage, current or resistance from the other two, with the power in watts.

  • Paint Calculator

    Work out the wall area and litres of paint for a room, with doors, windows, coats and ceiling.

  • Roofing Calculator

    Turn a roof’s footprint and pitch into the sloped area, squares, angle and rafter length.

  • Stair Calculator

    Lay out a straight stair: equal risers, treads, total run, angle and pitch line from the floor height.

  • Tile Calculator

    Work out the tiles and boxes for a floor or wall, with grout joints and a waste allowance.

  • Voltage Drop Calculator

    Estimate voltage drop in copper or aluminium cable for single-phase and three-phase circuits, and the smallest standard size for a target drop.

Text Tools 4

Word counts, case changes, duplicate lines and URL slugs.

  • Word & Character Counter

    Count words, characters, sentences, paragraphs and lines, with reading and speaking time. Works for Hindi too.

  • Case Converter

    Change text to upper, lower, title or sentence case, or to camelCase, snake_case and kebab-case.

  • Remove Duplicate Lines

    Paste a list and keep each line once, with options for case, spaces, blanks and sorting.

  • Slug Generator

    Turn a title into a clean URL slug: lower case, hyphens, accents removed, Hindi kept or dropped.

File Tools 4

Compress and resize images, size exam photos and make PDFs.

  • Image Compressor

    Make JPEG, PNG or WebP images smaller in your browser, by quality or to a target size, with no upload.

  • Photo & Signature Resizer

    Resize and compress a photo or signature to the pixels and KB an exam or job form asks for, in your browser.

  • Image Resizer

    Resize images by longest side, percentage or width and height, in your browser, with no upload.

  • Image to PDF

    Turn photos, scans and screenshots into one PDF in your browser, with no upload.

More from WebTools

  • Money calculators: Plan investments, compare loans, check tax and salary figures, and see the working behind every answer.
  • Health calculators: Body measures, energy needs, pregnancy dates and weather-related heat stress, each with its formula and source.
  • Maths and science calculators: Arithmetic, algebra, geometry, statistics, physics and chemistry, with the steps shown where it helps.
  • Developer tools: Formatters, encoders, decoders and checkers for everyday development work, all running in your browser.

Every tool explains its method and sources. See how we test the maths, or report a possible error.