Guide
Pour Over Coffee Ratio Calculator and Brew Chart
Calculate coffee and water for any pour over size. Compare 1:15, 1:16 and 1:17 ratios, understand strength versus extraction, and adjust by taste.
On This Page11 Sections
Quick Answer
A practical pour over range is 1:15 to 1:17, written as dry coffee mass to brew-water mass. At 1:16, 20 g coffee needs 320 g brew water. Multiply the coffee dose by the ratio factor to find water, or divide water by the factor to find coffee. Ratio primarily changes strength; it does not guarantee extraction or taste.
Key Takeaways
- 11:16 is a flexible starting point, not a universal best ratio.
- 2The formula is coffee x ratio factor = brew water.
- 3Brew water is the amount added, not the final beverage yield.
- 4Use ratio to correct strength, then use grind and technique to refine extraction.
Pour Over Ratio Calculator
Reader Tool
Pour Over Ratio Calculator
Set strength with ratio first. Use grind and pouring to fix extraction.
Target recipe
Balanced 1:16 pour over.
20g
320g
40g-60g
2:45-3:45
First brew: Use a medium to medium-fine grind, 90-96C water, and a calm bloom with 2-3 times the coffee dose.
Treat drawdown time as an observation, then adjust one variable after tasting. If the cup is thin but otherwise balanced, consider a stronger ratio.
Brew water is the input. The drink in the server will weigh less because the grounds and filter retain water.
The calculator works in both directions: enter coffee to calculate brew water, or enter brew water to calculate coffee. Treat the result as an input recipe. The final drink will weigh less because the grounds and filter retain water.
The Formula
For a ratio written 1:x:
Brew water = dry coffee x ratio factor
At 1:16:
20 g coffee x 16 = 320 g brew water
To work backward from available water:
Dry coffee = brew water / ratio factor
For 500 g water at 1:16:
500 / 16 = 31.25 g coffee, which can be rounded to 31 g for a scale reading in whole grams.
Pour Over Ratio Chart
This table scrolls horizontally on smaller screens.
| Dry coffee | 1:15 stronger | 1:16 balanced start | 1:17 lighter |
|---|---|---|---|
| 15 g | 225 g water | 240 g water | 255 g water |
| 18 g | 270 g water | 288 g water | 306 g water |
| 20 g | 300 g water | 320 g water | 340 g water |
| 25 g | 375 g water | 400 g water | 425 g water |
| 30 g | 450 g water | 480 g water | 510 g water |
These are brew-water inputs. They are not promises about cup volume, brew time, caffeine, or flavor.
Choosing Between 1:15, 1:16, and 1:17
This table scrolls horizontally on smaller screens.
| Ratio | Relative strength with the same coffee | Useful reason to try it |
|---|---|---|
| 1:15 | Stronger | The cup tastes balanced but too light |
| 1:16 | Middle starting point | You need a stable baseline |
| 1:17 | Lighter | The cup tastes balanced but too concentrated |
The labels are relative, not sensory guarantees. A 1:15 brew can taste weak if extraction is poor, and a 1:17 brew can still taste intense with a different coffee or roast.
Strength Is Not Extraction
Strength describes how concentrated the dissolved coffee is in the beverage. Extraction describes how much soluble material left the grounds. Ratio affects both, but they are not interchangeable.
If a cup tastes balanced but too strong or too light, ratio is a logical adjustment. If it tastes sharp, drying, hollow, or uneven, investigate grind, saturation, flow, water, and technique before assuming ratio alone is responsible.
| Cup assessment | Better first move |
|---|---|
| Balanced, too strong | Add more brew water next time or move from 1:15 toward 1:16 |
| Balanced, too light | Use less brew water next time or move from 1:17 toward 1:16 |
| Sharp and thin | Keep ratio fixed; test finer grind or more even saturation |
| Dry and harsh | Keep ratio fixed; test coarser grind or less agitation |
| Sharp and drying together | Check uneven flow and distribution before changing ratio |
Why Final Beverage Weight Is Lower
Coffee grounds retain water, and paper or cloth retains a smaller amount. A 20 g coffee plus 320 g brew-water recipe therefore does not deliver 320 g into the server. Retention varies with coffee, grind, filter, and drainage, so do not use one fixed loss figure as a universal conversion.
This distinction matters for nutrition language and recipe schema: brew water is an ingredient amount; beverage yield is what reaches the cup.
Ratio and Batch Size
Scaling the arithmetic is easy, but flow does not scale perfectly. A larger dose creates a deeper bed, often changes drawdown, and may exceed a dripper's comfortable capacity. Keep the ratio, use a brewer sized for the batch, and expect to adjust grind or pouring after tasting.
For the full 20 g workflow, use How to Make Pour Over Coffee. For choosing compatible equipment, use the Pour Over Setup Guide.
Common Ratio Errors
| Error | Correct approach |
|---|---|
| Mixing grams of coffee with fluid ounces of water | Use mass for both sides of the ratio |
| Calling 1:16 the universal best ratio | Present it as a practical starting point |
| Treating brew water as final yield | Account for retention without assuming a fixed amount |
| Changing ratio to fix every flavor defect | Separate strength decisions from extraction diagnosis |
| Scaling beyond brewer capacity | Check dripper and server capacity first |
| Changing ratio and grind together | Change one variable so the result remains interpretable |
Bottom Line
Start at 1:16 when you need a neutral baseline: 20 g coffee to 320 g brew water. Move toward 1:15 for greater concentration or 1:17 for less, provided the cup is otherwise balanced. Ratio solves the recipe arithmetic; careful brewing and tasting solve the cup.
Ratio Questions
What is the best pour over coffee ratio?
How much water do I need for 20 g of coffee?
How much coffee do I need for 500 g of water?
Does a lower ratio mean stronger coffee?
Why is my final cup lighter than the water I poured?
Should I change ratio or grind first?
Sources and Further Reading
Coffee Science Foundation
Towards a new brewing chartResearch context for distinguishing beverage strength and extraction.
Specialty Coffee Association
Flat vs. cone: basket shape is as important as grind size in drip brew coffeeResearch context for geometry, grind, and recipe interaction.