A brew ratio is just a multiplier: grams of water divided by grams of coffee.
Change the ratio and the calculation shifts — but the question is always the same.
Enter your ratio, your known quantity, and the calculator returns the missing number
instantly. Every formula is visible, every number is editable, and the ratio is a
starting point, not a verdict.
Coffee (g) & water (g)·Approximate cup count·Any brew method
Before you brew
The ratio is a taste starting point — not a fixed rule. The calculator does the arithmetic
exactly, but flavor depends on grind size, water temperature, brew time, and the coffee
itself. All ratios and method suggestions are approximate and labeled as such. Espresso uses
a different measurement convention (output ratio, not brew ratio) and is noted separately in
the reference tables below.
Set your brew ratio, choose what you know (water weight or coffee weight), enter the value, and the results update live. Ratios are editable and approximate — adjust until the cup tastes right.
Brew ratio
1 :
1:16 means 16 g water per 1 g coffee — a common drip starting point. Approximate; adjust to taste.
Which number are you missing?
g
Weight in grams. 1 g water ≈ 1 mL at room temperature.
g
Weight of ground or whole-bean coffee in grams.
Use coffee for water
Coffee
Water
Approx cups (8 oz)
The formulas, in full
The ratio is a single division or multiplication. Nothing is hidden, and neither formula
requires anything beyond arithmetic you could do on a napkin.
How each number is derived
1 — Coffee from water (default mode)
coffee_g = water_g ÷ ratio
Example: 500 g water ÷ 16 = 31.25 g coffee
2 — Water from coffee (alternate mode)
water_g = coffee_g × ratio
Example: 31.25 g coffee × 16 = 500 g water
3 — Approximate cups (8-oz U.S. standard)
cups ≈ water_g ÷ 237
Note: 1 g water ≈ 1 mL; 1 U.S. cup = 237 mL (8 fl oz).
Grounds absorb ~2 g per gram of coffee, so actual yield is slightly less.
Example: 500 g ÷ 237 ≈ 2.1 cups
Strength by ratio — a reference table
Ratios map loosely to perceived strength, but extraction variables — grind, temperature,
time — matter as much as ratio. These are approximate descriptors, not guarantees. Your
palate is the final arbiter.
Ratio (1:X)
Coffee per 500 g water
Approx strength
Notes (approximate / taste)
1:12
41.7 g
Very strong
Common for French press or AeroPress concentrate. Noticeably dense body; can mask origin character if over-extracted.
1:13
38.5 g
Strong
Heavy pour-over territory. Works well with lighter roasts where sweetness needs amplification.
1:14
35.7 g
Strong–medium
A popular competition pour-over target. Balanced strength with clear flavor development.
1:15
33.3 g
Medium–strong
SCA Golden Cup lower bound. Good starting point for most filter methods.
1:16
31.25 g
Medium
A widely cited drip default. Suits a broad range of roasts and grind sizes.
1:17
29.4 g
Medium–light
Toward the SCA Golden Cup upper bound. Clarity-forward; emphasizes brightness and delicate notes.
1:18
27.8 g
Mild
Very clean and light. Can taste thin or underextracted if grind is too coarse.
Strength descriptors are approximate and subjective. Grind size, water temperature, and brew time
affect extraction at least as much as ratio does. Values for "coffee per 500 g water" are rounded
to one decimal place for readability.
Typical ratios by brew method
Different methods extract at different rates, so the same ratio can taste under- or
over-extracted depending on how you brew. These ranges are starting points only —
all figures are approximate.
Method
Typical ratio range
Why this range (approximate / taste)
Drip / filter
1:15 – 1:17
Paper filter removes oils, producing a clean cup. This range aligns with the SCA Golden Cup Standard and suits most home brewers.
Pour-over (V60, Chemex)
1:14 – 1:17
Manual control over pour speed lets brewers compensate; many specialty shops target 1:15 to 1:16 for maximum flavor clarity.
French press
1:12 – 1:15
Metal filter retains oils and fines, producing a heavier body; a shorter ratio compensates without making the cup muddy.
AeroPress
1:10 – 1:16
Wide range because AeroPress is highly versatile. Shorter ratios make concentrate to dilute; longer ratios make ready-to-drink.
Cold brew (concentrate)
1:5 – 1:8
Intended for dilution 1:1 to 1:2 before drinking. Low temperature slows extraction, so a much shorter ratio is needed to develop flavor over 12–24 hours.
Moka pot
1:7 – 1:10
Pressure extraction at roughly 1.5 bar is more efficient than gravity methods. Output is a strong, concentrated brew meant to be sipped in small amounts.
Espresso (output ratio)
1:1.5 – 1:3 out
Espresso ratios are measured as coffee dose vs. liquid yield, not water in. A 18 g dose yielding 36 g of espresso is a 1:2 ratio. Not directly comparable to brew ratios above.
All ranges are approximate starting points based on common specialty-coffee practice. Taste
and adjust — a ratio that works for one coffee or roast level may not suit another.
Espresso output ratios are not the same measurement as brew ratios; they are noted here for
reference only and cannot be entered into the calculator above as-is.
Why weight beats volume for brewing
Scoops and tablespoons seem convenient, but the same scoop can hold wildly different
amounts of coffee depending on grind size, roast level, and how you fill it. Weight
removes all of that.
A tablespoon of coffee is not a fixed amount
Ground coffee density varies with roast and grind. A tablespoon of finely ground dark roast can weigh 8–9 g; the same tablespoon filled with a coarse light roast may hold only 4–5 g. That is a 2x difference from the same measuring tool. A scale eliminates the variable entirely — 20 g is always 20 g regardless of roast or grind.
Water weight and volume are nearly interchangeable at home temperatures
At room temperature, 1 gram of water is approximately 1 milliliter. That equivalence is close enough for brewing purposes that a kitchen scale handles both: weigh your water directly into the kettle and you have milliliters without a separate measuring jug. This is also why the cup estimate in the calculator divides water grams by 237 — one U.S. cup is 237 mL.
A scale is the single upgrade that most improves repeatability
Consistency is the point of using a ratio at all. If you can make a great cup once, a scale is what lets you make the same cup the next morning. Even an inexpensive kitchen scale accurate to 0.1 g is sufficient for filter coffee. For espresso, a scale accurate to 0.1 g and capable of measuring in real time (known as a drip scale) matters more because the dose and yield windows are narrow.
How to dial in a ratio you can repeat
Changing one variable at a time is the only reliable way to learn what your ratio is
actually doing to the cup.
Start with 1:16 and a mid-range grind
Brew a full cup using 1:16 and a medium grind — medium-coarse for pour-over, medium for drip. Taste it before adding anything. Write down the result: too bitter, too sour, or about right? This is your baseline.
Fix extraction before adjusting ratio
If the cup is sour or sharp, the problem is usually under-extraction — too coarse a grind or too short a brew time. If it is bitter or harsh, it is usually over-extraction. Adjust grind or time first; changing the ratio to compensate masks the root cause and makes future adjustments harder.
Move ratio in single steps
Once extraction is right, adjust ratio one unit at a time: 1:16 → 1:15 for more body, 1:16 → 1:17 for more clarity. Use the calculator to find the new coffee weight for your water amount. Taste after each change and write down what shifted.
Lock in a recipe when the cup is consistent
A recipe is just a ratio, a dose, a grind setting, a water temperature, and a brew time. Once you have a cup you want to repeat, note all five. The ratio this calculator gives you is the dose part — weigh it every time for the best chance of consistency.
Different coffees may need different ratios
A dense, light-roasted natural-process coffee often extracts differently than a porous, dark-roasted washed coffee. Start from your default ratio with each new bag, taste immediately, and adjust. The calculator makes it fast to find the new dose for any water amount.
Where to buy
Got your numbers? Here's where to pick up what you need:
The terms that show up in specialty coffee guides, recipe cards, and competition protocols —
in plain English.
Brew ratio
The relationship between coffee dose and water weight, expressed as parts water per part coffee (e.g., 1:16). A dimensionless multiplier — 1:16 means 16 g of water for every 1 g of coffee, regardless of batch size. The ratio determines concentration; extraction is controlled separately by grind, temperature, and time.
Dose
The weight of dry coffee used in a brew, measured in grams. Combined with brew ratio, it determines the water amount — and together they set the potential strength of the cup. "Dose" is used most precisely in espresso but applies to any brew method.
Brew yield
The weight of liquid in the cup after brewing — less than the water input because some water is absorbed by the grounds. For filter coffee, absorption is roughly 1–2 g per gram of coffee, so a 500 g water brew with 31 g of coffee yields about 465–468 g in the cup. The cup count estimate in this calculator does not account for absorption — it divides total water weight by 237, so actual cup yield is slightly less than the number shown.
TDS (total dissolved solids)
A measure of how much coffee material is dissolved in the brewed liquid, expressed as a percentage. The SCA Golden Cup Standard targets 1.15–1.35% TDS. TDS and ratio are related but not identical — two cups at the same ratio but different extractions can have different TDS. A refractometer measures TDS; most home brewers do not need one.
Extraction yield
The percentage of the ground coffee's mass that dissolved into the water during brewing. The SCA's Golden Cup Standard targets roughly 18–22% extraction for filter coffee. Under-extraction (below ~18%) tends to taste sour and sharp; over-extraction (above ~22%) tends to taste bitter and dry. Ratio affects concentration; grind, temperature, and time affect extraction yield.
SCA Golden Cup Standard
The Specialty Coffee Association's guideline for brewed filter coffee quality: approximately 1.15–1.35% TDS, achieved at roughly 18–22% extraction yield. These targets correspond to a brew ratio of about 1:15 to 1:18 with typical filter-coffee extraction. The guideline is a reference point, not a rule — many excellent cups fall outside it.
Output ratio (espresso)
In espresso, "ratio" refers to the relationship between the dry coffee dose and the liquid yield in the cup, not the water input. A 18 g dose that produces 36 g of espresso is a 1:2 output ratio. This is not the same as a brew ratio and cannot be entered into the calculator above as-is.
Frequently asked
There is no single best ratio — it depends on method, grind size, and personal taste. A 1:15 ratio produces a strong, full-bodied cup; 1:17 or 1:18 produces something lighter and more delicate. The SCA Golden Cup Standard suggests roughly 1:16 to 1:18 for drip. For espresso, the ratio is tighter and measured differently — see the output ratio glossary entry. French press typically lands at 1:12 to 1:15 because no paper filter strips body. Treat any ratio as a starting point and adjust in single-step increments until the cup matches what you want.
Volumetric measures like tablespoons are unreliable because ground coffee density varies with grind size and roast level — the same tablespoon can hold 4–8 g of coffee depending on how loosely or tightly it's packed. Weight removes all of that ambiguity: 20 g is always 20 g. Water is also weighed rather than measured in milliliters because 1 g of water ≈ 1 mL at room temperature, so a single kitchen scale handles both. The ratio arithmetic this calculator uses only makes sense in weight units.
A 1:16 brew ratio means 1 part coffee by weight for every 16 parts water. For 500 g of water you use 500 ÷ 16 = 31.25 g of coffee. The colon notation always reads coffee:water here. The ratio has no units — it is a dimensionless multiplier that works the same whether you're making one cup or a full carafe. When some guides write the ratio inverted as water:coffee, the math flips: a water:coffee ratio of 16 is the same thing as a 1:16 coffee:water ratio. This calculator always uses the coffee:water convention.
It depends on cup size and ratio. A standard U.S. cup is 8 fluid ounces (approximately 237 g of water). At a 1:16 ratio, one 8 oz cup requires about 14.8 g of coffee; at 1:15, about 15.8 g; at 1:17, about 13.9 g. In practice, most brewers use 15–20 g per cup for a full-flavored result. Espresso uses far more coffee per unit of liquid output — typically 18–22 g of ground coffee to yield 36–44 g of espresso — but the finished drink is only 1–2 oz.
Yes, because different methods extract differently. Paper-filtered drip and pour-over brew clean and lean — 1:15 to 1:17 works well. French press and AeroPress retain all the water through metal filters, producing a heavier body, so a shorter ratio like 1:12 to 1:15 is common. Cold brew uses 1:5 to 1:8 as a concentrate meant to be diluted before drinking. Moka pot runs 1:7 to 1:10. Espresso uses a separate output ratio convention entirely. See the method table above for a full reference.
Bitter and sour are extraction problems more than ratio problems, though they interact. A bitter cup usually means over-extraction — too fine a grind, too long a brew time, or water that is too hot. A sour or sharp cup usually means under-extraction — too coarse a grind, too short a brew time, or water below roughly 90°C / 195°F. Changing the ratio shifts concentration but not extraction balance. If your cup is bitter at 1:16, try a coarser grind before moving to 1:18. Adjust one variable at a time.
Yes, but cold brew ratios are much shorter — typically 1:5 to 1:8 for a concentrate, or 1:10 to 1:12 for ready-to-drink. If you enter 1:6 with 1000 g of water, the calculator correctly returns about 166.7 g of coffee and roughly 4.2 cups of concentrate. The cup count refers to the water volume, not the number of drinks — cold brew concentrate is usually diluted 1:1 to 1:2 before serving, so 4 cups of concentrate might yield 8 or more drinks. Use the calculator to get the weights, then handle dilution separately.
Approximate. The calculator divides water weight by 237 to estimate 8-oz cups, based on 1 g water ≈ 1 mL and 1 U.S. cup = 237 mL. Two rounding effects make it imprecise: (1) coffee grounds absorb roughly 1–2 g of water per gram of coffee, so a 31 g dose absorbs 31–62 g of the 500 g — the cup yield is slightly less than 2.1; (2) real mugs are rarely exactly 8 oz. The cup count is for scale-checking, not mug-filling. Trust the grams.
Common mistakes with the coffee ratio calculator
Coffee ratios are about precision, and most brewing problems trace back to imprecise measurement or misapplied technique — not a wrong ratio.
Measuring coffee by volume instead of weight
The same tablespoon can hold anywhere from 4 g to 8 g of coffee depending on grind size and roast level — a light roast ground coarse is much less dense than a dark roast ground fine. A "2 tablespoon" scoop from two different bags of coffee at different grinds can vary by 50% in actual mass. This calculator works in grams. Use a scale. The SCA Golden Cup Standard (1:15–1:18 ratio, ~55–65 g per litre) is weight-based for exactly this reason.
Adjusting the ratio to fix a bitter or sour cup
Bitterness and sourness are extraction problems, not ratio problems. An under-extracted cup (sour, sharp, thin) means the water moved through the grounds too fast or at too low a temperature — adjust grind finer or increase brew temperature. An over-extracted cup (bitter, dry, harsh) means the opposite. Changing the coffee-to-water ratio adjusts strength, not extraction balance. Fix the extraction first, then adjust the ratio if the strength is wrong.
Using the same ratio for every brew method
Immersion methods like French press and AeroPress use a shorter ratio (more coffee: less water, roughly 1:12–1:15) because the grounds steep in full contact with the water for the entire brew time. Percolation methods like drip and pour-over work well at 1:15–1:17 because water passes through progressively. Using a pour-over ratio in a French press will produce a weak, thin result; using a French press ratio in a drip machine tends to produce an overpowering, murky cup.
Not re-dialing after opening a new bag
Different origins, processing methods, and roast levels extract at different rates. A ratio that produces a balanced cup from a washed Ethiopian light roast will likely produce an over-extracted, bitter result from a natural Brazilian medium-dark roast at the same grind and time. When you open a new bag, start from the default ratio and taste — don't assume the last bag's dial transfers.