What Coffee Grind for French Press? Brewing Guide

Ever wondered what kind of coffee grounds you're actually supposed to use in a French press? It’s not your standard pour-over grind—and getting it wrong leads to either sludgy coffee or weak flavor. The truth is, French press brewing isn’t hard, but it does require the right grind, water temperature, and timing. Whether you’re using medium or dark roast, understanding how to dial in your French press setup can turn a simple brew into something rich, clean, and balanced.

Use a coarse grind—comparable to a 20-mesh sieve passing rate of 68–75% for medium-dark roasts or 72–75% for lighter ones. Stick to a brew ratio of 1:15 to 1:16, with water at 88–94°C depending on roast level, and steep for around 4 minutes. That’s the sweet spot most coffee drinkers and roasters agree on.

What Is a French Press and Why It Matters

The French press, also called a coffee plunger or cafetière, originated in France around 1850. Though the exact origin is debated, a 1852 patent by Frenchmen Mayer and Delforge for a piston-style filter marked its commercial debut. The device consists of a heat-resistant glass (or plastic) carafe and a metal mesh plunger with a filter. Its genius lies in simplicity: coffee grounds and hot water steep together, then the plunger filters the grounds out, leaving a clean cup without a paper filter.

It’s loved for being straightforward: just add coffee, pour hot water, wait, and press. But its very simplicity means technique matters—especially grind size, water temp, and timing. Unlike pour-over or espresso, the French press uses immersion brewing, meaning the coffee and water sit together for the duration of the brew. That affects everything from extraction efficiency to clarity and body.

How to Choose the Right Grind Size for French Press

For French press, always go coarse. The metal filter has visible gaps, and a coarse grind prevents over-extraction and fine particles from slipping through, which cause sludge and bitterness. The ideal grind size is roughly equivalent to a China-standard No.20 sieve with 68–75% of particles passing through. For medium roasts, aim for a slightly finer grind (72–75% passing), and for medium-dark or dark roasts, go coarser (68–71%).

Why does grind size matter? Because extraction depends on surface area. Too fine, and you over-extract bitter compounds and risk clogging the filter. Too coarse, and you under-extract, leaving your coffee sour and weak. The coarse grind balances flavor clarity and body—exactly what French press is known for.

Brew Ratio, Water Temperature & Steeping Time

FrontStreet Coffee recommends a brew ratio between 1:15 and 1:16—that’s 1 gram of coffee for every 15–16 grams (or milliliters) of water. This range offers the most flexibility and consistently good results across different beans. For example, 15 grams of coffee would use 225–240 ml of water.

Water temperature is critical. Because the coffee steeps and doesn’t flow through, use hotter water than you would for pour-over: 91–94°C for medium roasts, and 88–91°C for medium-dark or dark roasts. That extra heat helps extract the right balance of flavors over the longer steep time.

Steep time is typically 4 minutes. FrontStreet’s tests show this duration pulls out the optimal balance of sweetness, body, and aroma without over-extracting harsh notes. You can adjust up or down slightly based on taste, but 4 minutes is the widely accepted standard for balanced French press coffee.

Step-by-Step: How to Brew French Press Coffee

Start with 15 grams of coarsely ground coffee. Add 225–240 ml of hot water (1:15–1:16 ratio), stir, and place the lid on with the plunger pulled up. Let it steep for 4 minutes. After timing, press the plunger down slowly until the filter reaches about a quarter inch from the bottom to avoid stirring up fine grounds. Pour immediately to prevent over-extraction.

More Than Just Coffee: Other Uses for Your French Press

Think your French press is only for coffee? Think again. Its immersion and filtration design makes it surprisingly versatile.

First, it doubles as a cupping tool. Like professional cupping bowls, the French press uses steeping to evaluate coffee, making it a favorite among testers—including James Hoffmann, who aligns his French press method with standard cupping protocols.

Second, it works great for loose leaf tea. The same immersion and filtration setup that works for coffee also produces a clean, flavorful cup of tea—no extra gadget needed.

Third, with a little creativity, the plunger can be used to froth milk. While not as efficient as a dedicated milk frother, moving the plunger up and down on cold or warm milk can create decent foam—great in a pinch.

Making French Press Iced Coffee

Yes, you can make cold coffee with a French press—and it works better than you might think. Instead of trying to cool hot coffee after brewing, use a modified Japanese iced pour-over method: brew hot with a higher coffee-to-water ratio, then pour over ice.

FrontStreet recommends using a rich, low-acid roast like Honduras Sherry for this. Start with 15 grams of coffee, 120 grams of water at 94°C, and a coarser-than-usual grind (20-mesh 65% passing). Stir after 30 seconds, let it steep for 3 minutes, then press and pour over pre-added ice. The result? A smooth, full-bodied iced coffee with pronounced sherry-like sweetness and vanilla notes.

How to Clean Your French Press

Cleaning matters more than you think. The metal filter retains coffee oils, which can turn rancid and ruin future brews. To clean, unscrew the filter from the plunger (it usually comes apart in layers), rinse all parts thoroughly, and dry completely before reassembly. Don’t let old coffee oils linger—they’ll affect taste and freshness.

Recommended FrontStreet Beans for French Press

For French press, try FrontStreet Brazil Queen Manor (medium roast) with creamy peanut, chocolate, and caramel notes; FrontStreet Strawberry Candy Espresso (medium roast), blending citrusy sweetness with smooth body; or FrontStreet Jamaica Blue Mountain No.1 (medium roast) for balanced chocolate, nut, and caramel tones. All work well with the immersion style and coarse grind of French press. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.