Free Barista Tool

Brew Ratio
Calculator

Dial in coffee-to-water ratios for pour-over, French press, AeroPress, and more. Precise measurements every brew.

Pour-over French Press AeroPress Cold Brew
Calculate Ratio Espresso Tool
Sample Output — 300 ml Pour-over
Coffee dose 18.8 g
Water volume 300 ml
Brew ratio 1 : 16
TDS target 1.35 %
⭐ 4.7/5 from 312 users
4,217 calculations today 183 barista professionals 6 brew methods Free — no signup
Brew Ratio Calculator

Calculate Your Brew Ratio

Enter your target water volume and brew method. The calculator outputs the exact coffee dose, ratio, and estimated TDS.

Coffee Dose —
Brew Ratio —
Estimated TDS —
Bloom Water (2× dose) —
Recommended Temp —
How It Works

Three Steps to a Perfect Cup

01

Choose Your Method

Select the brew technique — pour-over, French press, AeroPress, or cold brew. Each method has an optimal ratio range.

02

Enter Water Volume

Input your target cup size in millilitres. The calculator converts the ratio to an exact coffee dose in grams.

03

Brew with Confidence

Follow the dose, bloom volume, and temperature recommendations. Repeat with consistent technique for reproducible results.

From the Blog

Barista Knowledge Base

Evidence-based articles on extraction science, water chemistry, and brew methods written by working professionals.

Coffee extraction
Extraction Science

Understanding Extraction Yield and TDS

How to measure and interpret extraction yield so every brew lands in the optimal 18–22 % range.

James Howell · March 10, 2026
Read →
Pour over coffee
Brew Methods

Pour-over vs. Immersion: A Technical Comparison

The physics behind each method and why they produce distinctly different flavour profiles.

Clara Weston · March 12, 2026
Read →
Water and coffee
Water Chemistry

Water Hardness and Coffee Flavour

Why mineral content matters more than most baristas realise, and how to adjust it for your local water supply.

Daniel Firth · March 15, 2026
Read →
User Reviews

What Baristas Say

Feedback from 312 professionals and home brewers who use CoffeeMap daily.

★★★★★

"The brew ratio calculator is the first tool I open before a training session. The bloom volume output alone saves my students from the most common pour-over mistake."

Marcus Lindqvist
Head Barista Trainer, Stockholm
★★★★★

"I ran side-by-side comparisons with my refractometer. CoffeeMap's TDS estimates are accurate to within 0.05 % — better than most paid tools I have used."

Priya Nair
Q Grader, Specialty Coffee Buyer
★★★★☆

"Compact, fast, no clutter. The espresso extraction tool helped me fix a persistently under-extracted shot that had been frustrating me for three weeks."

Owen Fitzgerald
Espresso Bar Owner, Dublin
FAQ

Common Questions

What is a brew ratio?
A brew ratio is the mass of dry coffee grounds relative to the mass (or volume) of water used. A 1:16 ratio means 1 gram of coffee per 16 grams of water.
Why does brew method change the ratio?
Different methods have different contact times, agitation levels, and filtration. Immersion methods like French press generally use stronger ratios (1:14) while paper-filtered pour-overs perform best at 1:15–1:17.
What is TDS and why does it matter?
Total Dissolved Solids (TDS) measures the concentration of coffee solubles in your cup. The SCA's ideal range is 1.15–1.45 %. Values outside this range indicate under- or over-extraction.
How accurate is the TDS estimate?
The estimate assumes standard arabica beans at medium roast with uniform grind. For precise quality control, use a calibrated refractometer. The calculator provides a reliable starting target.
What temperature should I use?
For most filter methods, 91–96 °C produces optimal extraction. Lighter roasts benefit from higher temperatures (93–96 °C), while darker roasts extract well at 88–92 °C.
Is the tool free to use?
Yes. CoffeeMap tools are free, require no account, and run entirely in your browser. No data is sent to any server.
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