Cold brew ratio calculator
Pick your strength, set your jar size, and get the exact grams of coffee and water — plus the steep time for a smooth, sweet, low-acid batch.
Cold brew style
You need
200g coarse coffee
steeped in 1000g cold water for 18 hours → ~2000ml served after a 1:1 dilution (≈ 6.7 iced drinks)
Use a coarse grind (like French press), steep in the fridge, then strain. Concentrate keeps 7–10 days sealed; dilute only what you'll drink in a day or two.
Brew it better
A tidy brewer and a coarse, even grind make cold brew easier and smoother:
Common questions
What is the best ratio for cold brew?
For a concentrate you'll dilute, use 1:4 to 1:8 coffee-to-water by weight — around 1:5 is a reliable start. For ready-to-drink cold brew, go 1:12 to 1:15. Weigh both coffee and water for a repeatable batch every time.
How long should cold brew steep?
12–24 hours in the fridge. Twelve hours is bright and light, 18 hours is the balanced sweet spot most people prefer, and 24 hours maximizes strength and sweetness. Past 24 hours it can turn woody and over-extracted.
How much coffee for 1 litre of cold brew?
At a 1:5 concentrate ratio, 1000g (1L) of water needs about 200g of coarse coffee. For ready-to-drink strength at 1:12, the same litre needs about 83g. Set your jar size in the calculator to get the exact number.
Do I dilute cold brew concentrate?
Yes — concentrate is brewed strong on purpose. Cut it about 1:1 with water, milk, or ice to serve. Ready-to-drink cold brew is already at drinking strength and needs no dilution. Undiluted concentrate also keeps far longer in the fridge.