Cold Brew Coffee Dilution Calculator

Cold Brew Coffee Dilution

Cold brew uses long steep times and cold water to extract a smooth, low-acid coffee. Two main styles:

1. Concentrate (1:4 to 1:8 ratio), meant to be diluted with water, milk, or mixers 2. Ready-to-drink (1:10 to 1:15 ratio), pour over ice, no dilution needed

Standard recipes:

Dilution rule of thumb: Concentrate ratio (1:N) → drink at 1:(2N) ratio

So 1:5 concentrate diluted 1:1 with water = 1:10 final ready-to-drink strength.

Caffeine content estimates:

• Standard concentrate (1:5): ~150-200 mg / fluid oz
• Diluted (1:10): ~75-100 mg / fluid oz
• Ready-to-drink (1:10): ~75-100 mg / fluid oz
• Light Japanese-style (1:15): ~50-70 mg / fluid oz

A 12 oz iced coffee from concentrate (1:5 + 1:1 dilution):

• 6 oz concentrate + 6 oz water/milk
• Caffeine: ~900-1,200 mg total: roughly 4-5× a standard hot coffee

Dilution math: Final volume = Coffee × N × (1 + dilution factor)

Example: 100 g coffee at 1:5 ratio = 500 g concentrate

• 1:1 dilution = 1,000 g final beverage
• 1:0.5 dilution = 750 g final beverage

Brewing tips:

• Use coarse grind (coarser than French press): fine grinds make muddy concentrate
• Filter twice: paper filter after the steep, then chill 4-6 hours for crystal-clear yield
• Refrigerate concentrate up to 2 weeks
• Diluted batches drop in flavor after 5-7 days

Why cold brew is smoother: Cold water doesn’t extract chlorogenic acids efficiently. The result: 60-70% less perceived acidity vs. iced hot-brewed coffee, with a sweeter, fuller mouthfeel — but you also miss some flavor compounds that only emerge above 90°C.