Tools
Every one of these shows its working, says what it assumes, and ends somewhere rather than stopping at a number.
Make a recipe
How much coffee, how much water, how much milk?
Quantities before brewing, in whichever direction you have the numbers. Every one of these shows its arithmetic so you can do it yourself next time.
- Coffee ratio and strength calculator
Work out how much coffee or water you need, or check the ratio you have been using.
- Brew recipe scaler
Take a recipe that works for one serving and make the right amount for a different number.
- Espresso dose and yield calculator
Work out the yield to stop a shot at, the dose to start from, or the ratio a shot actually hit.
- Pour-over planner
Turn a dose and a ratio into a bloom and a set of cumulative pour targets you can follow on a scale.
- Batch-brew calculator
Work out coffee and water for a number of people, and check it fits the brewer.
- Cold-brew dilution calculator
Work out how much water or milk to add to concentrate, or how much concentrate a target serving needs.
- Milk drink builder
Work out how much espresso and milk a given cup needs, and how much foam to aim for.
Improve my coffee
Something is wrong, or could be better — what do I change?
These take a symptom rather than a quantity and rank what to change, one thing at a time. They give ranked guidance rather than a diagnosis, because coffee faults rarely have exactly one cause.
- Espresso dial-in assistant
Work out which single variable to change next, and what to expect when you change it.
- Stronger, weaker or better brew assistant
Change one thing about a filter or immersion brew, in the right direction, for the right reason.
- Grind-size guide
Find a sensible grind starting point for a method, and know which way to move it.
- Water suitability helper
Interpret a hardness and alkalinity reading, and work out whether your water is worth doing something about.
Plan and buy
What should I buy, and how much coffee should I keep?
Category-level decisions and household planning. No brands, no prices, and several of these will tell you that you do not need the thing you were about to buy.
- Coffee supply planner
Work out how long a bag lasts, how much coffee a period needs, and whether to freeze any of it.
- Cost-per-cup calculator
Work out what a cup at home actually costs you, and how that compares with buying it.
- Coffee-maker selector
Narrow sixteen kinds of coffee maker down to the ones that suit how you actually drink coffee.
- Grinder selector
Work out what kind of grinder your brewing actually needs, and which specifications matter for it.
- Milk frother selector
Work out which way of frothing milk fits what you actually make, and what each one cannot do.
- Cleaning and maintenance planner
Get a checklist of the maintenance your setup actually needs, with cleaning and descaling kept apart.
- Do I need this accessory?
Find out which coffee accessories would actually change something for your setup, and which would not.
Understand
What does this actually mean?
Reference and interpretation rather than a recipe — including the tools whose honest answer is a range rather than a number.
How these work
Everything runs in your browser. Nothing you type is sent anywhere, nothing is stored, and no tool needs an account. Where a result depends on evidence with real spread it is shown as a range and labelled as one, and where it depends on judgement rather than arithmetic the page says so rather than presenting a heuristic in the same voice as a multiplication.