Calculators

Iced Pour-Over Calculator

Ice share

Hot water and ice

144 g hot water

96 g ice (240 g total water)

Total water includes the hot water and ice you add. The grounds retain some water, so the finished drink weighs less.

Count ice as part of the total water, then split it into hot water to pour and ice in the server. The default is 15 g of coffee at 1:16 with 40% ice, which is 144 g of hot water and 96 g of ice.

Updated: Sep 1, 2026 Reviewed by: Content and layout review

What this calculator does

Iced pour-over—also called Japanese iced coffee—is a pour-over variant: hot water moves through coffee and paper, then lands on ice already in the server. The drink you taste is that mixture after the ice melts.

Total water = hot water you pour + ice in the server. The default matches the brew ratio calculator: 15 g of coffee to 240 g of total water, or 1:16. At a 40% ice share, that is 144 g of hot water and 96 g of ice. For water, 1 g is about 1 ml. This total is the water and ice you add. The grounds retain some water, so the finished drink weighs less.

This is not cold brew. Cold brew steeps in cool water from the start. Extraction here still happens with hot water.

How to use it

If you know the dose, choose “I have coffee,” then change coffee, ratio, or ice share. If you know the combined weight of hot water and ice you want to use, choose “I know the total water” and work backward to the dose.

1:15, 1:16, and 1:17 are common total-water starting points. 30%, 35%, and 40% are common ways to split that total into ice. Typing a different number deselects those buttons.

Where the numbers come from

Perfect Daily Grind describes this iced method as keeping the same total water, with part of it frozen first. One interviewee uses 1:17, about 65% hot water and 35% ice. Another keeps ice at no more than 30% to 40% of the total, so enough hot water still moves through the bed.

Hoffmann’s 2018 demo uses about 60% hot water and 40% ice, and raises the dose to 65 g per liter of total water, or about 5 g more than a hot brew. The calculator combines his 40% ice share with a common hot-filter ratio of 1:16, so its default does not reproduce his complete recipe. For a stronger cup, increase the proportion of coffee to total water or lower the ice share so more hot water passes through.

What the number cannot tell you

The calculator provides hot-water and ice quantities; grind size, brew time, and water temperature still need to be adjusted by taste. A large amount of unmelted ice usually indicates too much ice relative to hot water. For the hot-filter ratio itself, see brew ratio.

Common Misconceptions

  • Do I add ice on top of a full hot brew?

    No. Ice is part of the total water. The default 240 g of total water is 96 g of ice and 144 g of hot water to pour.

  • Does it have to be 40% ice?

    No. Hoffmann’s demo uses about 40%. Perfect Daily Grind’s interviews include 35%, and a 30% to 40% ceiling so enough hot water still extracts. More ice usually means a colder cup and less hot water through the bed.

  • Is this the same as cold brew?

    No. Cold brew steeps in cool water for a long time. Iced pour-over sends hot water through the grounds onto ice. See the cold-brew page.

  • Will less hot water under-extract?

    It can. Only the hot portion passes through the bed. Some people grind a little finer or use a bit more coffee relative to the total water. This page does not calculate grind and does not guarantee extraction.

  • What if ice is still sitting in the server?

    You may have used too much ice, or the cubes were colder than you expected. Next time, use less ice and more hot water. Judge the result by temperature and flavor rather than requiring every cube to melt.

Sources and Notes