Caffeine.supply

Coffee Tools

Free interactive tools built on our database of 619 specialty coffees — calculators, a taste-match quiz, a roaster map, and more.

Coffee for a Crowd

Planning a party, meeting, or event? See exactly how many grounds, bags, and dollars you need for any guest count.

Caffeine Calculator

Find out exactly how much caffeine you’re drinking based on brew method and cups per day.

Cost Per Cup Calculator

See what your coffee really costs per cup, per day, and per year from bag price and dose.

Brew Ratio Calculator

Dial in the perfect coffee-to-water ratio for any brew method and batch size.

Extraction Calculator

Plot your TDS and extraction yield on the SCA Brewing Control Chart.

Food Pairing Finder

Search any dessert or snack to find the coffees that pair best with it.

Coffee Freshness Checker

Enter your roast date to see exactly where your beans are in their peak flavor window.

Compare Coffees

Put any two coffees side-by-side — origin, process, price, and flavor notes.

Compare Roasters

Head-to-head roaster matchups — catalog size, average rating, price per ounce, and origins.

Browse 100+ specialty roasters plotted across the US on an interactive map.

Find Your Coffee

A quick quiz that matches your taste preferences to your next favorite bag.

Coffee of the Day

A new specialty pick, spotlighted daily from our full catalog.

Coffee to Water Ratio

No scale? Convert any brew ratio into tablespoons and cups instead.

Explore the catalog by flavor category, from stone fruit to dark chocolate.

Grind Size Guide

Compare grind size — fine to coarse — across every brew method, with micron ranges.

Coffee Water Guide

Check your water’s TDS against the SCA standard — is it good for brewing?

Coffee Glossary

46 specialty coffee terms explained in plain English, from bloom to varietal.

Equipment Guide

Grinders, brewers, and gear buying guides for every stage of the coffee ritual.

Roaster Spotlight

A new featured roaster’s story, sourcing philosophy, and top picks — every week.

Take the quiz and get a shareable taste-profile card of your Coffee DNA.

Frequently Asked Questions

Are these coffee tools free to use?

Yes — every tool on this page is free, with no signup or account required. Each one runs entirely in your browser and draws on our database of 619 specialty coffees from 100 roasters.

Which coffee calculator should I use first?

Start with the Brew Ratio Calculator if you’re dialing in a new brew method, or the Caffeine Calculator if you’re managing intake. Already own beans? The Coffee Freshness Checker tells you if they’re still at peak flavor.

What data powers these tools?

The calculators combine standard brewing references — the SCA Brewing Control Chart, published caffeine-content ranges by method, and roast-staling curves — with our own catalog of coffees, roasters, and flavor notes for tools like Compare and Find Your Coffee.

Do the calculators work for any brand of coffee, not just what’s on this site?

Yes. The Brew Ratio, Extraction, Caffeine, Cost Per Cup, Coffee for a Crowd, Coffee to Water Ratio, Freshness, and Water Quality tools all accept your own numbers and work with any bag of coffee. Only Compare, Find Your Coffee, and Coffee DNA are limited to coffees in our catalog.

How often is the tool data updated?

The underlying coffee catalog — prices, availability, and roaster counts — is rebuilt continuously as our database changes. Reference values used in the calculators (brewing ratios, caffeine ranges) follow established SCA and industry standards and change rarely.