Espresso & Coffee Calculators

How to use this

Enter your dose and pick a ratio. The calculator shows your target yield — the exact number to watch on your scale before you stop the shot. Add your actual shot time and it'll tell you whether to grind finer or coarser.

What ratio should I use?

• 1:1.5-1:1.8 (ristretto): concentrated, syrupy, common with darker roasts.
• 1:2 (classic): the most widely used modern starting point.
• 1:2.5-1:3 (long/lungo): often suits lighter roasts, brings out more clarity.

Ratios are a starting point, not a rule — taste the shot and adjust. See our full dialing-in guide for the complete process.

How to use this

Pick your brew method, then enter whichever amount you already know — coffee or water — and the calculator fills in the other one using that method's standard ratio.

Treat these as a starting point — adjust ±10% to taste depending on your beans and equipment.

How to use this

Select your water hardness and typical daily use, and check the filter box if you use one. You'll get a recommended interval in weeks and a suggested next-descale date.

Why this matters

Scale buildup restricts flow, insulates heating elements, and is one of the leading causes of premature espresso machine failure. Descaling on a schedule prevents nearly all of it. Always confirm your machine's specific descaling procedure — see our full maintenance guide.

Reading the result

TDS tells you strength; extraction yield tells you whether you pulled the right amount of soluble material out of the coffee. The two are related but not the same measurement.

How this works

This matches you to one machine from the specific models we've bought, tested for months, and reviewed in full — not a generic spec-sheet match. See the complete lineup on our buying guide.

Reading the milk

• Glossy, paint-like texture: you're in the right zone — this is microfoam.
• Big bubbles / foamy: too much air introduced, usually early in the steam.
• Flat, sweetish-then-off taste: overheated past target — the pitcher should be uncomfortably warm to hold, not painful.

Stop steaming right around your target range — milk keeps rising a couple of degrees after you pull the wand out.

How this is calculated

We estimate roughly 18g of beans per shot, then compare your per-drink cost at home against your cafe price to find monthly savings and payback period on your equipment.

This is a directional estimate — it doesn't include milk, electricity, or the (real, if hard to price) value of not leaving the house.

Why roast date matters more than "best by"

Freshly roasted coffee releases carbon dioxide for days after roasting. Too fresh and that gas can make extraction uneven; too old and the flavor compounds have faded. Roast date on the bag — not the "best by" date — is what to track.

Store beans whole, in an airtight container, away from light and heat, and buy amounts you'll finish within a few weeks.

The three types, briefly

Full breakdown on our homepage boiler guide and in each machine's individual review.

General diagnostic order

1. 1. Check grind size first — it has the biggest single effect on flow rate.
2. 2. Check dose and distribution before changing anything else.
3. 3. Change one variable at a time and taste before adjusting again.