How to Calculate Exact Age and Date Difference
Gives the gap between two dates as years, months and days, and also as a total in days, weeks and hours.
Everyday tool guides
Clear guidance for calculations, conversions, timers, codes and practical daily tasks.
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28 articles
How to Convert Square Metres, Feet, Acres and Hectares
Converts between metric and imperial area units using exact squared factors. A square foot is 0.09290304 m² — which is 0.3048 squared, not 0.3048.
How to Generate a Barcode That Works
Generates a scannable barcode in CODE128, EAN-13, UPC-A or CODE39 from whatever value you enter.
How to Create an Accurate Countdown for Any Event
Counts down to any date and time you pick, updating every second, in days, hours, minutes and seconds.
How to Convert KB, MB, GB and Data Units
Converts storage and bandwidth units using binary multiples of 1024 — the convention operating systems use, where a kilobyte is 1024 bytes and a gigabyte…
How to Add, Subtract and Compare Calendar Dates
Finds the number of days between two dates, and adds or subtracts a period from a date to give the resulting one.
How to Calculate Discounts, Coupons and Final Prices
Works out what you actually pay after a discount, an optional stacked coupon and sales tax.
How to Estimate the Electricity Cost of Any Appliance
Multiplies watts by hours by days, converts to kilowatt-hours and multiplies by your tariff, giving the cost of running one appliance over a period.
How to Solve Linear and Quadratic Equations
Solves ax² + bx + c = 0 for x, giving both roots along with the discriminant that determines what kind of roots they are.
How to Add, Subtract, Multiply and Divide Fractions
Adds, subtracts, multiplies and divides two fractions, returning the result in lowest terms.
How to Convert Length and Distance Units
Converts between metric, imperial and nautical units using the exact defined factors rather than the approximations. A mile is exactly 1609.344 m, a yard…
How to Solve Everyday Arithmetic Step by Step
Evaluates a whole expression at once — brackets, powers, multiplication, division, addition and subtraction — with standard precedence.
How to Calculate Percentages Without Mixing Up the Formula
Handles the three percentage questions people actually ask: what is A% of B, A is what percent of B, and what is the percentage change from A to B.
How to Use a Pomodoro Timer Without Breaking Your Focus
Runs alternating work and break intervals with the lengths you set, defaulting to the classic 25 and 5.
How to Create a QR Code That Scans Reliably
Turns any text or URL into a QR code PNG at one of three sizes and four error-correction levels.
How to Scan a QR Code Safely in Your Browser
Decodes a QR code from an image file or your camera and shows you the raw contents as text.
How to Generate Random Numbers for Draws and Tests
Generates numbers in a range you set, one or many, with an option to make every result unique.
How to Pick a Random Name Fairly
Picks one or several options at random from a list you paste in, with an option to avoid repeats.
How to Convert Speed Units Correctly
Converts between m/s, km/h, mph, knots and ft/s using exact factors relative to metres per second.
How to Time Tasks, Laps and Events Accurately
Times elapsed duration to a hundredth of a second, with lap splits recorded as you go.
How to Convert Celsius, Fahrenheit and Kelvin
Converts between Celsius, Fahrenheit and Kelvin. Because the scales are offset, each conversion needs both a factor and an addition: °F = °C × 9/5 + 32…
How to Add and Subtract Hours and Minutes
Adds and subtracts durations in hours, minutes and seconds, carrying correctly at sixty rather than a hundred.
How to Convert Meeting Times Between Time Zones
Converts a specific date and time between timezones using the IANA timezone database built into your browser.
How to Split a Restaurant Bill and Tip Fairly
Works out the tip, the total and what each person owes, with an option to round each share up so the collected amount actually covers the bill.
How to Test and Improve Your Typing Speed
Times you against a sample passage and reports words per minute alongside accuracy.
How to Convert Measurement Units Accurately
Converts within Length, Mass, Area, Volume, Speed, Data and Time, plus Temperature, which is handled separately because it does not scale from zero.
How to Convert Volume and Capacity Units
Converts between metric and US customary volumes, and includes the UK gallon separately at 4.54609 L against the US gallon’s 3.785411784 L.
How to Convert Weight and Mass Units
Converts between metric and imperial mass units using exact factors. A pound is exactly 0.45359237 kg, defined by the same 1959 agreement that fixed the inch.
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What this Everyday section covers
Clear guidance for calculations, conversions, timers, codes and practical daily tasks. This archive is kept focused so readers can move from a broad topic to a specific tool, setting or workflow without landing on a thin tag page.
Each article is written to answer a practical question: what to use, which setting matters, what the limits are, and how to avoid wasting time or damaging a file.
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