Tool
Batch-brew calculator
Coffee and water for however many cups you need, with a capacity check so the answer is one your brewer can actually make.
Coffee: 120g · Water: 1920ml total
Uses the same ratio maths as the coffee-to-water calculator, scaled up to your total batch size — see the coffee-to-water ratio guide for what the ratio does and doesn't control.
How it works
Cups multiplied by cup size gives the water; water divided by the ratio gives the coffee. The capacity check then compares the total against the brewer range you enter.
What the inputs mean
- Cup size
- How much finished coffee one person gets. Mugs are commonly 250-350 ml; a small cup is nearer 150 ml.
Worked examples
Filter coffee for four at breakfast
- 4 cups
- 250 ml per cup
- Ratio 1:16.7
Result: 1,000 g of water and 60 g of coffee.
Common mistakes
Forgetting that the grounds keep some of the water
A 1,000 g brew yields noticeably less than a litre in the pot. Add a little extra water if the finished volume matters.
Using the same grind as for a single cup
A deeper bed drains more slowly. Larger batches usually want a slightly coarser grind.
What the result does not mean
- Fitting inside the brewer's capacity does not mean the brewer will extract evenly at that size.
What this does not account for
- Uses a linear ratio scaled by cup count — does not model how larger coffee beds can extract slightly differently from single-cup brews.
- Ignores the water the grounds retain, which is roughly twice their own weight and comes off the finished volume rather than the brew water.
- The capacity check compares against a general brewer capacity range you enter, not a specific product's exact limit.