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Moka Pot Calculator
Pick your moka pot size and get the exact grounds and water — filled correctly, every time.
By Michael Anderson
Last Updated: September 21, 2026
Moka pots are sized by "cups," but those aren't standard drinking cups — they're small, strong, espresso-adjacent servings. Pick your pot size and this calculator gives you the exact water fill and grounds for it.
Pick Your Moka Pot Size
Water (to below the valve)
300 ml (10.1 oz)
Grounds (level, not tamped)
30 g
Fill grounds level with the basket rim — don't tamp a moka pot basket like an espresso puck.
Get an Even Fine-Medium Grind
Moka pot brewing is sensitive to grind consistency — uneven particles cause uneven extraction. These burr grinders handle the fine-medium range well.
4.6· $199-$299
Baratza Encore ESPAn electric grinder with stepless micro-adjustment under $250 and Baratza's repair-friendly design, spanning espresso through French press.
4.4· $179-$199
Breville Smart Grinder ProA versatile electric grinder for both espresso and filter coffee, with a Dosing IQ feature for consistent shot-to-shot repeatability.
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How a moka pot actually brews
A moka pot heats water in the bottom chamber until building steam pressure pushes it up through the coffee grounds and into the top chamber. It's not true espresso pressure (closer to 1-1.5 bar than espresso's 9 bar), but it produces a small, concentrated, espresso-like coffee that's usually diluted or used as a base for milk drinks.
Because the pressure comes from heat rather than a pump, the grind, dose, and heat level all matter more than they would on a drip machine — small changes can stall the brew or make it run too fast.
Common moka pot mistakes
- Tamping the basket. Level the grounds, don't compress them — tamping can stall the brew or force water around the puck instead of through it.
- Overfilling past the valve. Water above the pressure release valve is a safety risk, not a way to brew more coffee.
- High heat the whole time. Brew on medium-low and pull the pot off the burner as soon as the flow lightens and sputters.
Frequently Asked Questions
Fill the basket level with grounds up to the rim, without tamping — a 6-cup moka pot typically takes about 30g.
Tamping a moka pot basket like an espresso puck can restrict flow too much and stall the brew.
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