Some tools you use once a year. These are the opposite — the ones you reach for on a random Tuesday. Converting cups to grams mid-recipe. Figuring out whether that "quick nap" will leave you groggy. Cleaning up text pasted from a PDF that came with mystery line breaks. Fifteen small tools for the friction of everyday life, all free, all private.
Health numbers worth knowing
The TDEE & macro calculator answers the question behind every diet: how many calories do you actually burn? It uses the Mifflin-St Jeor equation with your weight, height, age, and activity level, then splits the result into protein, carbs, and fat. It handles both US (lbs) and UK (stone) inputs, because nobody should have to convert their own body weight to use a calculator.
Sleep is the other pillar. The sleep cycle calculator works backward from your alarm in 90-minute REM cycles — wake up at the end of a cycle and you feel dramatically better than waking mid-cycle, even with less total sleep. Want to be up at 6:30? The math says asleep by 11:00 or 12:30, not midnight. It feels like a trick until you try it for a week.
Also here for the practical side of life: a pet medication dosage calculator (mg/kg to ml — because misdosing a 4kg cat is genuinely dangerous), a BAC & sober-time estimator, and an EV charging cost calculator for anyone weighing petrol against electric.
Text tools for people who write
Copy text from a PDF and you get line breaks in the middle of sentences, double spaces, and smart quotes that break code. The clean text tool normalizes all of it in one pass. The case converter flips between UPPER, lower, Title Case, and camelCase — a lifesaver when a client sends a spreadsheet of SHOUTING column headers.
Writers get the word counter with character counts and reading-time estimates (handy: the average adult reads ~200–250 words per minute, so a 1,000-word article is a 4–5 minute read). The text diff checker highlights exactly what changed between two versions — I use this constantly for contracts and config files. And the markdown editor gives you a live preview with HTML export for READMEs and docs.
Money and measurement
The commute fuel cost calculator turns "it's only 20 miles" into an annual number — at $3.50/gallon and 25 MPG, a 40-mile round trip costs about $2,000 a year in fuel alone, before wear and tear. That number has ended more than one "should I take the far-away job" debate. The flooring calculator adds the 10% wastage pros always include (and amateurs always forget) when estimating tiles or laminate.
The unit converter covers length, weight, temperature, volume, and more — the unglamorous backbone of recipes, DIY, and international shopping. And for anyone running email on a custom domain, the SPF/DKIM/DMARC generator writes the DNS records that keep your emails out of spam folders.
Small tools, zero friction
The philosophy here is simple: open, use, done. No accounts, no "create a free workspace," no onboarding tour for a word counter. Your health numbers and personal text stay in your browser — which matters more than people realize for things like medication dosages and salary-adjacent calculations. These are the tabs you'll keep open, not the ones you visit once.
A day with these tools
6:30 AM: the sleep calculator said bed at 11:00 PM for a 6:30 alarm — you actually feel human. 8:00 AM: the TDEE calculator planned today's 2,100 calories; breakfast fits the macros. 10:00 AM: a client sends requirements as a SHOUTING spreadsheet — case converter fixes the headers in seconds. Noon: the recipe calls for 2 cups of flour but your scale measures grams — unit converter says 250g.
3:00 PM: comparing two contract drafts with the diff checker before signing. 5:30 PM: the commute calculator confirms the new office costs $2,400 a year in fuel — suddenly the remote-work negotiation has a number attached. 9:00 PM: writing tomorrow's presentation, the word counter keeps each slide's speaker notes tight. Mundane? Absolutely. That's the point — life admin is 90% of life.