What is the best ratio for cold brew?

A 1:5 ratio (coffee to water) makes a strong concentrate ideal for diluting with water, milk, or ice. A 1:8 ratio makes a lighter concentrate that some prefer to drink straight. Start with 1:5 and dilute to taste.

How long should cold brew steep?

Between 12 and 24 hours in the fridge. 16-18 hours is the sweet spot for most people — long enough to extract plenty of flavour without becoming bitter. Shorter steeps give lighter, more delicate flavours.

Why does cold brew taste different from hot coffee?

Cold water extracts different flavour compounds than hot water. Cold brew is typically 67% less acidic, smoother, and naturally sweeter. The slow extraction produces a mellow, chocolatey flavour profile.

How long does cold brew concentrate last?

Undiluted cold brew concentrate keeps in the fridge for up to 2 weeks. Once diluted, drink within 2-3 days. Always store in a sealed container.

What grind size should I use?

Use a coarse grind, similar to raw sugar or sea salt. Too fine a grind will over-extract during the long steep time, resulting in bitter coffee, and makes it harder to filter.

How do I dilute cold brew concentrate?

Mix concentrate 1:1 with cold water, milk, or your preferred liquid. Adjust the dilution to taste — some prefer it stronger (2:1 concentrate to water) and others lighter (1:2). Serve over ice.

BakeCalcs

Cold Brew Coffee Calculator

Calculate the right amount of coffee and water for cold brew concentrate based on your preferred ratio and batch size.

Batch Size (Water)

Total water to use

Steep Time

Coffee-to-Water Ratio

How We Calculate This

Cold brew is made by steeping coarsely-ground coffee in cold or room-temperature water for 12-24 hours. The result is a concentrate that you dilute before drinking.

The Formula

Coffee (g) = Water (ml) / Ratio
Concentrate yield = Water used x 0.7 (grounds absorb ~30%)
Diluted servings = Concentrate x 2 / 250ml (diluted 1:1)

Common Ratios

1:5 — Strong concentrate, best diluted before drinking
1:6 — Medium concentrate, good balance
1:8 — Light concentrate, drinkable straight or with a little ice

Frequently Asked Questions

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Last updated: February 2026

All calculations are based on standard ratios and conversions. Results may vary with specific ingredients, equipment, and conditions.