Everyday

How much paint a room needs, allowing for doors and windows

Work out the bricks and mortar a wall needs, for a single or double skin wall

Paste raw SMTP headers and get structured JSON

Work out the CO2e of a regular commute by transport mode, per week and per year, using UK DEFRA conversion factors

Convert text to binary, hexadecimal or decimal codes per character, and back again

Add glitchy combining diacritics to any text

Words per minute and accuracy over a timed passage

Work out how much grass seed a lawn needs, for a new lawn or overseeding, and how many bags to buy

Daily calorie burn from height, weight, age and activity

Scale ingredients up or down into amounts you can measure

Work out tank volume, water weight and a rough stocking guide from tank dimensions

Generate usernames by combining word lists and a number, cut to fit a maximum length

Look up file extensions and their content types

Time something with lap splits, started and stopped from the keyboard

Check a bag against an airline weight allowance, see how much is spare or over, and the excess fee at a given rate per kilogram

How many packs of flooring a room needs, including waste

Work out the volume of concrete needed for a slab, footing or column, in cubic metres and bags

Work out the finished size of a cross stitch design from its stitch count and fabric count, and how much fabric to cut

Build one SPF TXT value from explicitly declared include domains and IP networks

Estimate the CO2e of a flight from its distance and cabin class, using UK DEFRA conversion factors with and without radiative forcing

Compare price per unit across differently sized packs to see which one is better value

Flip text upside down using Unicode characters

Click when the colour changes, over five attempts

What four clinical formulas say your weight should be

Create copyright headers for your project

Convert Markdown-style text to mIRC color codes

Flip any number of coins and see the full sequence, the heads and tails counts, and the longest run

Look up named entities, characters, and numeric codes

What you need on the final exam to hit your target grade

Count down to zero with presets and an alert when it lands

Work out a car value year by year from the purchase price and an annual depreciation rate, with the value today, at a chosen year, and the total lost

Parse repeated contact properties or generate one RFC 6350 vCard 4.0 contact

Soil, compost or mulch for a bed, in litres and bags

Work out how many plasterboard sheets, screws and how much joint compound a room needs

Work out how many stitches to cast on and rows to knit for a target size, from a gauge swatch

Work out how much a trip costs in fuel from the distance, consumption and fuel price

Convert plain text to Unicode styled characters

Work out the expected harvest window from a sowing date and the days to maturity

Split a calorie target into protein, carbohydrate and fat

Dough hydration in baker's percentages, starter included

Roll any number of dice of any size with a modifier, using D&D notation like 3d6+2

Work and break cycles with a round counter

Work out the total cost of a trip from nights, daily spend by category, flights and a contingency, per person and in total, with a daily allowance left over once the fixed costs are taken out

Work out the cost of heating a home from daily kWh use and a unit rate, per day, month and year, plus what one degree on the thermostat costs

Work out the posts, rails and panels for a fence run, with the post spacing this gives you

Parse named, quoted, and parenthesized email address formats

Build a truth table for a boolean expression using AND, OR, NOT, XOR and brackets

Convert English text to Pig Latin

Work out when to sow seeds indoors, from the last frost date and the number of weeks before it

Five training zones from your age and resting heart rate

Alcohol by volume from original and final gravity

Pick a set number of names from a list, with or without putting each one back

Look up ISO 639-1 and ISO 639-2 codes for 55+ languages

Several named counters you can click up and down

Work out annual generation from an array size, orientation and tilt, and the payback period from install cost, export rate and how much of the power is used in the home

Work out how much grout a tiled area needs from the tile size and the joint width

Calculate roll length for identical rectangular pieces across a stated usable width

Paste a plain-text email and get Markdown

Work out what an appliance costs to run from its wattage, hours a day and the price per unit

Transform plain text to 1337 speak

Pace per kilometre and mile, and equivalent finish times

Generate random strings of a chosen length from a chosen alphabet, for test data or sample IDs

Work out how many rolls of insulation a loft or wall needs, and the U-value improvement

Work out pixel count, aspect ratio, pixel density and a comfortable viewing distance for a display

Replace common English words with matching emoji

Count boundary-to-boundary positions on a square or staggered grid in a rectangular bed

Estimate body fat from tape measurements

Split a list of names into a set number of balanced teams, or into teams of a fixed size

Compare buying against renting a textbook across a number of terms, including resale value

Adjustable tempo with an accented downbeat and tap tempo

Work out the board feet and cost of a cut list from the dimensions of each piece

Check the tag syntax of a pasted DKIM public-key DNS record

Work out the annual cost and CO2e of home electricity and gas use, and the effect of changing one of them, using UK DEFRA conversion factors

Build a times table grid from 1 up to a chosen limit

Work out how much fertiliser to apply for an area, from its N-P-K ratio and a target nitrogen rate

Internal temperatures for every level of doneness

Pair a list of names so nobody draws themselves, with optional exclusions for couples or families

Work out your attendance percentage so far, and how many more sessions you can miss and still hit a target

Work out roof pitch in degrees, ratio and percent, and the rafter length

For fun: life path, expression and soul urge numbers from a full name and birth date, using the standard Pythagorean letter chart

A daily protein range for your weight and training

Draw a set number of unique winning ticket numbers from a numbered raffle

Look up the common Git command for a task, described in plain words rather than git jargon

Work out an overall grade from weighted assessments, and what score is still needed on the rest

Work out the boards, joists and fixings a deck needs from its dimensions, board width and gap, with a waste allowance

Estimated due date and trimester dates from the last period

Work out how a recipe scales between two tin sizes by area or volume, with a suggested bake time change

Pick one option from a list, optionally weighting some options more than others

Look up the KeyboardEvent.key, .code and legacy numeric .keyCode for a keyboard key, searchable by any of them

Work out the fabric width and drop a curtain needs from the window size and heading type, with pattern repeat and hem allowed for

For fun: the Western star sign for a birth date, with its date range, element and ruling planet

Bedtimes that wake you at the end of a sleep cycle

Shuffle a list into a numbered running order, for a batting order, a presentation order or a playlist

Calculate installed lumens and whole lamps from area, target lux, and explicit light-loss factors

Work out how many tiles and boxes an area needs, allowing for waste from cuts

Estimate blood alcohol concentration from units drunk, body weight, sex and time elapsed using the Widmark formula, against the UK and Scottish drink drive limits

Generate random calendar dates between two bounds

Look up an IANA timezone name, its current UTC offset and the current local time, computed live so daylight saving is always correct

Work out how many rolls of wallpaper a room needs, allowing for the pattern repeat

For fun: physical, emotional and intellectual biorhythm cycles for a target date, worked out as sine waves from a birth date

Estimate VO₂ max from the distance completed in a Cooper 12-minute run

Assign a list of names evenly across a set of named groups

Estimate the fertile window, ovulation date and next period from the last period date and usual cycle length, using the luteal phase method

Work out the coffee and water for a brew ratio and method, scaling from either the coffee amount or the water amount

Enter options and spin to land on one

Convert blood glucose between mmol/L and mg/dL, and HbA1c between the IFCC (mmol/mol) and DCCT (percent) units with the estimated average glucose that HbA1c implies

Look up ASCII 0-127 and the printable Latin-1 Supplement (160-255) in decimal, hex, octal and binary

For fun: ask a yes or no question and get one of the 20 classic Magic 8-Ball answers

Work out the NHS blood pressure band for a systolic and diastolic reading, and the reading that would move it into the next band

Compare the Du Bois, Mosteller, Haycock and Boyd formulas for body surface area from height and weight

Work out evenly spaced dose times across your waking hours from how many doses a day you take, plus the gap between doses

Create a harmless retro blue-screen message as copyable HTML

Decode classic pager codes or turn text into multi-tap phone-key sequences

Turn one-player-per-line data into a clean numbered team roster

Format cues, notes and a summary into the Cornell note-taking structure

Estimate carbon dioxide absorbed by a group of trees over a chosen period

Sort pantry items by expiry and flag food that should be used soon

Arrange an experiment hypothesis, method, observations and conclusion as Markdown

List notes and scale degrees for a root note and common scale pattern

Compare weighted positive and negative arguments and report the net score

Build diatonic triads from a key and scale-degree sequence

Sort tasks into four urgency-and-importance quadrants from simple flags

Transpose chord symbols in a chord sheet by a chosen number of semitones

Group task lines into To Do, In Progress and Done columns as Markdown

Add scoring events for two sides and report the current result

Compare physical dimensions for standard, micro and nano SIM cards

Summarize wins, losses, draws, points, form and scoring difference

Write private notes that auto-save in this browser with word count and download