Iced Americano: How to Account for Melting Ice

Espresso, Explained · Part 7

An iced americano gets diluted twice as the ice melts. Deciding the finished volume before you build the drink, rather than filling with ice and topping up, is what makes it repeatable.

01 Dilution happens twice

The first round happens while you build the drink.

Hot espresso hits the ice and melts the surface of it immediately. Water has already been added before the glass leaves your hand.

The second round happens while it is being drunk.

Heat from the hand and the room keeps the ice melting. That is why a drink that tasted right when you made it turns watery ten minutes later.

So the reference point is the drinking, not the making.

A glass consumed at the counter and one carried out of the door cannot be built the same way.

02 Do not fill with ice and pour into what is left

Filling the glass with ice first leaves a different amount of room every time.

Cube size and how they stack decide the space that remains. That is why the same drink comes out strong one day and weak the next.

Decide the finished volume first.

Take one glass, build a version you are happy with, then record the amount of ice and the amount of water that produced it. From then on you are repeating a recipe rather than guessing.

Count the ice instead of eyeballing it.

A set number of scoops, or a fill line on the glass, keeps the drink the same when someone else makes it.

03 The ice itself changes the drink

Crushed ice melts far faster.

For the same weight it presents much more surface to the liquid. Larger cubes are the better choice for takeaway and delivery.

Chilling the glass reduces the early melt.

Keep glasses in the fridge or rinse them with cold water and less of the ice is spent cooling the glass itself. The difference is obvious in summer.

Coffee ice removes dilution altogether.

What melts into the drink is coffee rather than water. The trade-off is that whatever you froze is exactly what ends up in the glass, so freeze something worth drinking.

04 Iced drinks need their own numbers

Cold suppresses flavour.

At low temperature sweetness and aroma read faintly while bitterness and acidity stand out. A ratio that worked hot can taste hollow over ice.

Do not carry americano numbers into an iced latte.

Milk changes how much of the coffee comes through, so the ice and the shot need to be set separately.

What happens	Cause	What to do
Strength varies glass to glass	Topping up whatever room is left	Set the finished volume and measure the water
Watery after ten minutes	Ice keeps melting	Use larger cubes and chill the glass first
Weak from the first sip	Too little ice or too much water	Count the ice and cut the water
More acidic than it is hot	Cold brings acidity forward	Try a slightly longer shot for iced drinks

Write the numbers down once.

Ice, shot, water and glass size are the four figures you need. With those on paper you will not be starting from scratch next summer.

First Penguin Coffee Company We roast to order and ship afterwards, including blends chosen to hold up once they are poured over ice. Our coffees are listed under Beans in the top menu. Enquiries: 010-3444-1721

Also in Korean This article is also published in Korean. The original series it draws on, 50 parts on café practice, runs on our Naver blog. Read the Korean series

Next: oat milk, and why it curdles in coffee.