Calculators & Utilities tools

36 free Calculators & Utilities tools that run in your browser, including Unit Converter, CM to Inches, Inches to CM, CM to Feet.

  • Unit Converter — Convert length, weight, temperature, area, volume, speed, data, pressure, energy, angle and fuel economy with exact factors.
  • CM to Inches Converter — Turn centimetres into inches instantly, with a ready reference table of common lengths.
  • Inches to CM Converter — Turn inches into centimetres using the exact 2.54 cm definition, with a quick reference table.
  • CM to Feet & Inches Converter — Convert centimetres to feet and to feet-and-inches — handy for heights on forms and profiles.
  • KG to LBS Converter — Convert kilograms to pounds using the exact international pound definition.
  • LBS to KG Converter — Convert pounds to kilograms precisely, with a table of common body and luggage weights.
  • Celsius to Fahrenheit Converter — Convert Celsius to Fahrenheit with the formula shown and a table of everyday temperatures.
  • Fahrenheit to Celsius Converter — Convert Fahrenheit to Celsius — including body temperatures and oven settings — with the formula shown.
  • KM to Miles Converter — Convert kilometres to miles, with race distances like 5K, half and full marathon in the table.
  • Data Storage Converter — Convert bytes, KB, MB, GB and TB and see decimal and binary (KiB, MiB, GiB) values side by side.
  • Percentage Calculator — Work out X% of Y, what percent one number is of another, percentage change, and marks percentage.
  • Age Calculator — Find your exact age in years, months and days on any date, plus total days and your next birthday.
  • Days Between Dates Calculator — Count the days, weeks, months and working days between two dates, with or without the end date.
  • Add or Subtract Days from a Date — Add or subtract days, weeks, months, years or working days from any date to find the result.
  • Time Zone Converter & Meeting Planner — Convert a time between any world time zones with daylight-saving handled and a meeting planner grid.
  • Loan Calculator with Amortisation Schedule — Calculate loan repayments, total interest and a full amortisation schedule, including extra payments.
  • Compound Interest Calculator — See how savings grow with compound interest, any compounding frequency and regular contributions.
  • BMI Calculator — Calculate body mass index in metric or imperial units, with WHO categories and the Asian cut-offs.
  • Discount Calculator — Work out the sale price, your savings and the real discount when several discounts and tax stack up.
  • Online Scientific Calculator — A full scientific calculator with trig, logs, powers, factorials, memory and history — keyboard friendly.
  • Random Number Generator — Generate truly random numbers in any range — single or many, with or without repeats.
  • Spin the Wheel — Spin a wheel of names or choices to pick a fair random winner, with weights and remove-winner mode.
  • Online Stopwatch with Laps — A precise online stopwatch with lap and split times, keyboard shortcuts and CSV export.
  • Online Timer & Countdown — Run one or several countdown timers with an alarm, presets and a countdown in the tab title.
  • Pomodoro Timer — Work in focused sessions with short and long breaks, custom lengths and daily focus stats.
  • Roman Numeral Converter — Convert numbers to Roman numerals and back, with strict validation of the numeral you type.
  • Online Microphone Test — Check that your microphone works with a live level meter and waveform, then record and play back.
  • Online Webcam Test — Check your webcam's picture, resolution and real frame rate, and take a snapshot — all in your browser.
  • Online Keyboard Tester — Press keys to see which ones register, check key codes and test how many keys work at once.
  • Dead Pixel Test — Fill your screen with solid colours to spot dead or stuck pixels and backlight bleed, plus a pixel fixer.
  • Colour Blindness Test & Simulator — Screen your colour vision with freshly generated dot plates and see how images look with colour blindness.
  • What Is My Screen Resolution? — See your screen's resolution in physical and CSS pixels, pixel ratio, viewport size, colour depth and refresh rate.
  • Reaction Time Test — Measure your visual reaction time over five tries with false-start detection and a personal best.
  • Online Hearing Test (Frequency Screening) — A headphone hearing screening across 250 Hz–8 kHz for each ear, with a simple chart of your results.
  • Password Strength Checker — Estimate how long a password would take to crack and get specific advice — checked privately on your device.
  • Refresh Rate Test — Measure your display's refresh rate, frame-time stability and dropped frames, with a side-by-side motion test.