There's a ritual to the French press that we genuinely love. The coarse grind, the slow pour, the four-minute wait before you press. It's a hands-on brew that rewards attention, and the single most important variable in that whole process is the ratio of coffee to water.
Get the ratio right and everything else falls into place. Get it wrong and no amount of good beans, careful technique, or perfect grind will save you from a cup that's either thin and sour or thick and overwhelming. We've seen it happen. We've tasted it ourselves. The 1:15 ratio is where we start every single French press we brew on our own kitchen counter before we ever recommend a coffee for it.
Key Takeaways
- The standard ratio is 1:15, one gram of coffee for every 15 grams of water. For a 12 oz (350ml) cup, that's 23 grams of coffee.
- Adjust by feel, not formula: Move to 1:12 for a bold, full-bodied cup or 1:17 for something lighter that lets floral and fruit notes shine.
- Weight beats volume: A tablespoon of dark roast weighs less than a tablespoon of light roast, using grams removes that variable entirely.
- Grind size matters: A medium-coarse grind (like raw sugar) at 1:15 is the most consistent combination. Too fine at this ratio causes over-extraction and bitterness.
- Bloom first: Pouring twice the coffee weight in water for a 30-second bloom before the full pour releases CO2 and leads to a more even, sweeter extraction.
- Press and pour immediately: Letting brewed French press coffee sit on the grounds after pressing continues extraction and turns a good cup bitter.
- Fresh-roasted beans make the ratio count: Stale coffee tastes flat regardless of ratio. Our small-batch roast-to-order approach means you're working with beans that have something to give.
In This Guide
The 1:15 Ratio Explained
The 1:15 coffee-to-water ratio is the Specialty Coffee Association's recommended baseline for most immersion brewing methods, including French press. The numbers are simple: one part coffee, fifteen parts water, measured by weight.
What makes it the right starting point isn't that it's perfect for every person or every bean. It's that it's balanced. At 1:15, a well-roasted coffee should express its full flavor, the body from the oils that French press preserves, the sweetness from proper extraction, and the clarity of whatever origin characteristics your beans bring. From there, you can dial up or down based on what your palate tells you.
Why We Measure by Weight
Coffee density varies with roast level, a tablespoon of light roast weighs more than a tablespoon of dark roast. Weight removes that variable. If you brew by volume today and by weight tomorrow, you're measuring two different things. A good grinder and a simple kitchen scale are the two tools that matter most for consistent French press.
Ratio by French Press Size
French presses come in a range of sizes and the same 1:15 ratio applies to all of them. Here's how it translates into real numbers so you can measure without doing math every morning:
| French Press Size | Water | Coffee at 1:15 | Approx. Tablespoons |
|---|---|---|---|
| 8 oz (240ml) | 240ml | 16g | ~2.5 tbsp |
| 12 oz (350ml) | 350ml | 23g | ~3.5 tbsp Most Common |
| 17 oz (500ml) | 500ml | 33g | ~5 tbsp |
| 34 oz (1L) | 1000ml | 67g | ~10 tbsp |
| 51 oz (1.5L) | 1500ml | 100g | ~15 tbsp |
A standard tablespoon holds roughly 6 to 7 grams of medium-ground coffee, so it's a reasonable proxy when you don't have a scale handy. Just know that tablespoon measurements will vary slightly based on your grind size and roast level, weight is always more reliable for repeatability.
Adjusting the Ratio to Your Taste
The 1:15 ratio is a starting point. Once you've brewed it a few times and have a feel for the baseline, adjusting is how you make French press your own. These are the three positions we recommend working within:
| Ratio | Strength | Best For | Coffee per 350ml |
|---|---|---|---|
| 1:12 | Bold, concentrated | Black coffee drinkers, dark roasts, coffee with milk or cream | 29g (~4.5 tbsp) |
| 1:15 | Balanced | Most people, most roasts, the sweet spot | 23g (~3.5 tbsp) Start Here |
| 1:17 | Lighter, more delicate | Light roasts, single origins with floral or fruit notes | 21g (~3 tbsp) |
If your French press tastes bitter, the ratio is likely too strong (1:12 or 1:13), or your grind is too fine. Move the ratio weaker first. If it tastes thin or sour, you're under-extracting: move stronger or check that your grind isn't too coarse. For ratios across all brewing methods, our coffee-to-water ratio guide has a complete reference.
Grams vs. Tablespoons: Which Should You Use?
If you have a kitchen scale, use grams. It takes 10 seconds and eliminates the single biggest source of inconsistency in home brewing. Most digital scales cost under $15 and are accurate to 0.1g, more than precise enough for coffee.
If you don't have a scale, tablespoons work fine. Use the guide above and accept that your results will vary slightly between bags and grind settings. A standard tablespoon of medium-ground coffee weighs approximately 6 to 7 grams. A standard tablespoon of finely ground coffee weighs slightly more; coarsely ground, slightly less. The reason this matters is simple: a darker roast loses more moisture and puffs up during roasting, so the same scoop holds fewer actual grams of coffee than a lighter roast does. That is the exact variable a scale removes.
In our experience: Switching from tablespoons to weight is the single most impactful change most home brewers can make. It's not about perfectionism, it's about repeatability. When you find a cup you love, you want to be able to make it again. We weigh every cup we cup in our roastery for the same reason, consistency is the only way to tell whether a change actually improved the coffee.
How Grind Size Affects Your Ratio
Ratio and grind size work together. A coarser grind extracts more slowly and less completely at any given ratio, if you're grinding very coarse, you may need to move to 1:13 or 1:14 to get full flavor. A finer grind extracts faster and more aggressively, at 1:15, a fine grind can push you into over-extraction and bitterness.
For French press, we recommend a medium-coarse grind, roughly the texture of raw sugar or coarse sea salt. This grind at the 1:15 ratio with a 4-minute steep is the most reliable combination for a balanced, full-bodied cup. If you're unsure about your grind setting, our French press grind size guide covers it in detail.
One thing worth mentioning from our side of the counter: we air-roast all of our coffee on a fluid-bed air roaster, where the beans tumble in a column of hot air rather than tumbling against a hot metal drum. In practice that lifts off more of the papery chaff and gives you a cleaner, less bitter brew. In a French press you'll notice less sediment and a cleaner cup at any ratio, which also means the ratio differences become more noticeable, not less. The coffee is doing its job, and the ratio is yours to fine-tune.
Step-by-Step French Press Brew Guide
Once your ratio is dialed in, the process is straightforward. Here's how we brew a 12 oz (350ml) cup at 1:15:
- Weigh 23g of whole bean coffee. Grind medium-coarse, about the texture of raw sugar.
- Heat your water to 195 to 205°F (just off boil, let it rest 30 seconds after boiling).
- Preheat your French press by rinsing it with hot water. This keeps your brew temperature stable and your cup hot longer.
- Add your grounds to the empty, warmed press.
- Pour about 46g of water (twice the weight of your coffee) over the grounds. Stir gently to saturate everything. Wait 30 seconds, this is the bloom, where CO2 releases from fresh coffee. If your coffee blooms vigorously, it's fresh.
- Pour the remaining water (up to 350ml total) in a slow, steady stream. Place the lid on with the plunger pulled all the way up.
- Steep for 4 minutes. Don't stir, don't peek. If you want to explore how steep time changes the cup, our French press steep time guide covers the full range.
- Press slowly and pour immediately. Don't let brewed coffee sit on the grounds, it will over-extract and turn bitter within a few minutes.
The Bloom Is Your Freshness Indicator
Fresh coffee releases CO2 aggressively when it hits hot water, you'll see it bubble and swell. That gas is trapped from roasting and slowly escapes as the beans age, so a flat, lifeless bloom is one of the clearest signs a coffee is stale. Stale coffee extracts unevenly and tastes flat regardless of your ratio. This is why we roast to order: every bag we ship is roasted within days of leaving our roaster.
Which HWC Coffees Work Best in a French Press
French press is a full-immersion method that preserves the natural oils in coffee, oils that paper filters strip out. This makes it particularly well-suited to coffees with rich body and complex flavor, and less ideal for very delicate light roasts where clarity is the point.
Here's how our current available lineup works in a French press at 1:15, based on what we taste when we cup these coffees ourselves:
- Colombia El Tiple, our signature roast. Dense, chocolatey, with caramel notes. This is the French press coffee we reach for most mornings. Excellent at 1:15; outstanding at 1:13 if you want something that stands up to milk.
- Guatemala Los Huipiles, chocolate, brown sugar, and a nutty finish. One of the friendliest coffees we roast in French press. Approachable and consistent.
- House Blend, designed for everyday brewing. Reliable at 1:15 in any method, including French press.
- Costa Rica Tarrazu, a natural-process coffee with a full, syrupy body and notes of milk chocolate, star fruit, strawberry, almond, and cane sugar. Clean and well-balanced in a French press. Try it at the standard 1:15 and adjust from there.
If you tend to brew a French press later in the day, our Evening Grace Decaf is a Colombian decaf made with the sugarcane (EA) process, which keeps the cup smooth and round without the caffeine. It brews on the same 1:15 baseline as everything above.
If you're not sure where to start, the Colombia El Tiple is our go-to recommendation for French press. It was developed as our signature roast and performs consistently across every brewing method. For a complete breakdown of which beans work best in immersion brewing, see our guide on the best coffee for French press. Or if you're weighing French press against other methods, French press vs. pour over covers the trade-offs directly.
Fresh Coffee Makes the Ratio Count
Every variable in your brew, ratio, grind, temperature, technique, only matters as much as your beans allow. We roast to order in small batches, so the coffee you receive was roasted within days, not weeks or months ago. Questions about which roast to pick? Reach us at 360-270-8106 and we'll point you to the right bag.
Shop Fresh-Roasted CoffeeThe best starting ratio is 1:15, one gram of coffee for every 15 grams of water. For a 12 oz (350ml) cup, that's 23 grams of coffee. This produces a balanced, full-bodied cup that expresses the coffee's natural flavors without being overpowering. Adjust to 1:12 for stronger coffee or 1:17 for something lighter.
For a 12 oz French press at the 1:15 ratio, use about 3.5 tablespoons (23g) of coffee. A standard tablespoon holds roughly 6 to 7 grams of medium-ground coffee. Tablespoons are a reasonable approximation, but weight in grams is more accurate, coffee density varies with roast level, so the same volume of light roast and dark roast will weigh different amounts.
Bitterness in French press usually comes from over-extraction, either the ratio is too strong (too much coffee relative to water), the grind is too fine, or you steeped too long. Start by loosening your grind to medium-coarse, then try the 1:15 ratio with a 4-minute steep. If bitterness persists, move your ratio slightly weaker to 1:16 or 1:17 before changing anything else.
Grams are more reliable because coffee density changes with roast level, a tablespoon of light roast weighs more than a tablespoon of dark roast. If you want consistent results batch to batch, use a scale. If you don't have one, tablespoons work fine as a starting point. Just expect slight variation between different coffees and grind settings.
Yes, 1:15 is a reasonable starting point for all roast levels, but slight adjustments are worth experimenting with. Dark roasts often taste stronger at 1:15 due to their lower density and more soluble compounds, you might prefer 1:16 or 1:17. Light roasts and naturally processed coffees may benefit from a stronger 1:13 to bring out full flavor in the French press environment.
Four minutes is the standard steep time for French press at a medium-coarse grind. Steeping longer than 5 minutes at this grind size increases the risk of over-extraction and bitterness. If you prefer a shorter steep, grind slightly finer to compensate, or vice versa. The ratio and steep time work together: a stronger ratio with a shorter steep can produce similar results to a weaker ratio with a longer steep.
Water between 195 to 205°F (90 to 96°C) is ideal for French press. This is just off boil, if you don't have a thermometer, bring water to a full boil and let it rest for 30 seconds before pouring. Water that's too cool will under-extract and taste sour; water that's boiling can scorch delicate light roast coffees. Most medium and dark roasts are forgiving across this range.
Medium-coarse is the right target, roughly the texture of raw sugar or coarse sea salt. This grind size allows for complete extraction during the 4-minute steep without over-extracting (which causes bitterness) or clogging the French press filter. If you're using a burr grinder, start at the coarser end of the medium setting. A blade grinder produces inconsistent particle sizes that make ratio control difficult regardless of how much you use.
Sources: Specialty Coffee Association, Brewing Best Practices and Coffee Standards. National Coffee Association, How to Brew Coffee (water temperature and grind guidance).
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