Practical
The measurement and conversion tools that don't belong anywhere else but get opened the most. 29 tools, including Closet capsule outfit calculator, Clothing size converter, Commute Life Wasted Calculator and Dew Point Calculator. All free, with no account and nothing to install.
Closet capsule outfit calculatorA small mix-and-match wardrobe makes a surprising number of outfits. Tops × bottoms, plus each dress, multiplied by your layering options and — if you count them — your shoes: the combinations add up fast.Clothing size converterTops, bottoms and shirt collars converted separately between FR, IT, DE, UK and US — each with the body measurement EN 13402 makes its primary dimension.Commute Life Wasted CalculatorSee how many hours, full days and years of your life your commute adds up to — and what you could have done instead.Dew Point CalculatorDew point from air temperature and relative humidity (Magnus formula), with a comfort band.Diaper Size CalculatorThe right nappy size for your baby's weight, how many you'll use, and when to size up.Dishwasher Load OptimizerEnter what needs washing to see how many cycles you need and whether the next load is full enough to run.Fishing knot strength calculatorEvery fishing knot weakens the line a little. Pick your knot, line type and rated strength, and this calculator estimates the knot's breaking strength — in pounds and kilograms — from its typical efficiency, so you know roughly how much of your line's rating survives the knot.Gift Idea GeneratorRanks a hand-written library of 170 gift ideas against who you are buying for, the occasion, your budget and the interests you type in, and tells you why each one came out on top. A curated library with a scoring rule, not a language model — the same answers come back every time.Hair dye mixing calculatorSplit a total amount of hair colour and developer at the right mixing ratio — 1:1 for standard permanent colour, 1:2 for high-lift blonde, 2:1 for a toner. Enter the finished amount you want and get how much of each to combine.Hamster power calculatorHow many hamsters on wheels would it take to power your gadgets? Pick an appliance (or enter custom watts), choose how energetic your hamsters are and their shift length, and this tongue-in-cheek calculator works out the size of the rodent workforce you would need — plus the combined wheel-hours per day.Jet lag recovery time calculatorEstimate how many days it takes to recover from jet lag based on time zones crossed.Keyboard mileage calculatorEver wonder how far your fingers travel across the keyboard? Enter your typing speed, hours per day and years of typing, and this playful calculator estimates the total keystrokes and the distance your fingertips cover — in miles and kilometers — assuming about 19 mm of finger travel per keystroke.Laundry detergent dosage calculatorHow much liquid detergent a load really needs — over-dosing wastes money and leaves residue, under-dosing leaves it dirty. It scales a base dose by load size, how soiled the wash is, water hardness and whether the machine is high-efficiency, and gives millilitres and cap-fulls.LEGO brick house calculatorA playful build estimator: how many classic 2×4 LEGO bricks it takes to wall in a house of a given footprint and height. It works from the standard brick (31.8 mm long, 9.6 mm tall), counts the courses and the bricks per course around the perimeter, and totals them.Love compatibility calculatorA light-hearted names game: type two names and get a compatibility percentage plus a FLAMES result (Friends, Love, Affection, Marriage, Enemies, Siblings). It is a fixed, deterministic play on the letters — the same names always give the same answer — and is purely for fun, with no predictive meaning.Meeting Cost TickerWatch the real-time cost of a meeting tick up from attendee count and hourly rates, with per-person and projected totals.Polite Excuse GeneratorWrites several ready-to-send ways to say no, composed from hand-written sentence banks and varied by who you are answering, the tone you pick and how much you want to reveal. A curated composer, not a model — the same choices reproduce the same set, and a reshuffle draws a new one.Poop salary calculatorGet paid to poop? Technically, yes. Enter your salary, your daily bathroom break and your working schedule, and this cheeky calculator reveals how much you earn on the toilet each day, each year and across the rest of your career — in the currency of your choice.Popcorn fill room calculatorA gloriously pointless question, answered with real physics: how many pieces of popcorn would it take to fill a room? From the dimensions and a kernel type it accounts for the air gaps between pieces (~64% packing) and returns the count, weight, cost and a few absurd comparisons.Postal code by cityType a city and get its postal code or code range, across 26 countries — Paris 75001–75020, Berlin 10115–14199, São Paulo 01000-000 – 05999-999. A curated list of major cities, not every municipality: when a town is missing it is our list that is short, and the tool says which.Postal code lookupCheck a postal code against the real format of 26 countries and read what it means. For France the first two digits give the department — all 101 — and for Spain the province, all 52; elsewhere you get the structure, the validity check and the major cities we hold. Not a postal database, and it says so.Seed germination rate calculatorTest a seed batch and read its viability: the germination rate is simply the seeds that sprouted divided by the seeds sown, as a percentage. Enter both and, optionally, how many seedlings you actually need — it works out how many seeds to sow with a safety buffer.Shoe size converterEU, UK, US and Japanese shoe sizes side by side for women and men, each row tied to the foot length in millimetres — the one figure that does not change from brand to brand.Sobriety CalculatorTrack your streak since a quit date, with money saved, units avoided and milestone badges for alcohol, smoking or any habit.Teleportation error rate calculatorA gloriously unscientific thought experiment: if teleporters existed, how likely is a botched reassembly? From your body mass, the teleporter tier, the distance and your last meal, it estimates an error rate, your survival odds and the number of atoms it politely misplaces along the way.Toilet Paper Value CalculatorCompare up to 5 packs on price per sheet, per 100 sheets and per ply-adjusted sheet — the only figure that is fair when the ply counts differ.Travel Itinerary GeneratorBuilds a day-by-day plan from a real library of named attractions across ten cities, grouping each day by neighbourhood so you are not criss-crossing the city, and scaling stops to your pace — relaxed 2–3, packed 5–6. Your interests bubble matching places to the top. A curated library, not a model, so for a city it doesn't cover it says so and lists the ten it does.Vampire apocalypse calculatorA tongue-in-cheek epidemic model: seed a town with a few vampires and it runs a day-by-day predator–prey simulation — vampires feed and convert humans, while slayers and sunlight thin their ranks. It reports how many humans and vampires remain, and the day humanity falls, if it does.Words to pages calculatorEstimate how many pages a word count fills, single or double spaced.