Online Coffee Guide

Coffee Drink

Cold Brew Tonic: Recipe, Ratios, Calories and Caffeine

By Jason HarrisReviewed by Online Coffee Guide editorial teamPublished Updated 4 min read

Cold brew tonic combines chilled cold brew, tonic water and ice. Start with 120 g (4.2 oz) ready-to-drink coffee, 120 ml (4.1 US fl oz) tonic and 100 g (3.5 oz) ice in a 400 ml (13.5 US fl oz) glass. If your coffee is concentrate, dilute it first. The tonic supplies quinine bitterness and, depending on its formulation, sugar.

Dark coffee above sparkling water and ice in a tall glass with a lemon wedge.
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Drink Snapshot

Caffeine
Varies by cold brewUse the chosen cold brew’s caffeine informationA separate USDA ordinary-brewed-coffee reference gives 48 mg for 120 g (4.2 oz). That is a comparison for ordinary brewed coffee, not this cold-brew recipe.
Calories
About 25 kcalNamed-tonic label plus generic coffee estimate120 ml Q US Premium Tonic contributes about 24.3 kcal; a generic 120 g black-coffee reference adds 1.2 kcal. The 25.5 kcal sum is rounded to the nearest five.
Serving, sugar and sources
Serving
1 glass: 120 g (4.2 oz) ready-to-drink cold brew, 120 ml (4.1 US fl oz) tonic and 100 g (3.5 oz) ice
Made with
Ready-to-drink cold brew + tonic water
Sugar
About 6 g total. About 5.95 g from the named tonic, all labeled added sugar. The generic black-coffee reference contains no sugar; other tonics differ.
Preparation
About 2 minutes; coffee already prepared and chilled

The 400 ml (13.5 US fl oz) figure is glass capacity. Coffee mass, tonic volume and ice mass are separate inputs. Garnish is optional and excluded. See the full calculation or label comparison.

Key Takeaways

  • 1Use drinking-strength cold brew. Dilute concentrate according to its directions before adding tonic.
  • 2Add cold tonic to the ice, then pour the chilled coffee slowly. Leave room for the foam.
  • 3The named regular-tonic version is about 25 kcal with 6 g sugar. Caffeine depends on the chosen cold brew.
On This Page10 Sections

What Does Cold Brew Tonic Taste Like?

Cold brew tonic is chilled coffee with a bittersweet, carbonated mixer. Tonic brings quinine bitterness and its own sweetener profile; the coffee brings the flavor of the beans and brew. Citrus peel can add aroma, but it is optional.

Compared with espresso tonic, cold brew changes the coffee base; flavor and caffeine follow the ingredients and portions. If you want bubbles without tonic's quinine, choose coffee soda.

Cold Brew Tonic Recipe and Ratio

Glass: 400 ml (13.5 US fl oz) capacity, leaving headroom.

Use 120 g (4.2 oz) ready-to-drink coffee and 120 ml (4.1 US fl oz) tonic with the measured ice. Add ice and tonic first, then pour the coffee slowly. Adjust the balance to taste.

Recipe

Ready-to-Drink Cold Brew Tonic

Makes:
1 iced drink in a 400 ml (13.5 US fl oz) glass
Time:
2 minutes; chilled coffee ready

Ingredients

  • 120 g (4.2 oz) chilled ready-to-drink black cold brew
  • 120 ml (4.1 US fl oz) chilled tonic water
  • 100 g (3.5 oz) water ice

Equipment

  • Scale, liquid measure, spoon, 400 ml (13.5 US fl oz) glass

Method

  1. Prepare. If using concentrate, dilute it according to its label first. Weigh 120 g (4.2 oz) of the chilled, ready-to-drink coffee.
  2. Build. Put 100 g (3.5 oz) ice in a 400 ml (13.5 US fl oz) glass. Measure and gently add 120 ml (4.1 US fl oz) chilled tonic.
  3. Pour. Slowly add the 120 g (4.2 oz) coffee over the ice. Pause if foam rises toward the rim.
  4. Finish. Stir once gently, leave headroom and serve immediately.

Estimated nutrition per serving: Approximately 25 calories; total sugar 6 g. Serving: 1 glass: 120 g (4.2 oz) ready-to-drink cold brew, 120 ml (4.1 US fl oz) tonic and 100 g (3.5 oz) ice.

Recipe notes

With Q US Premium Tonic: about 25 kcal and 6 g sugar; coffee energy is a generic estimate. Use your coffee’s product information for its caffeine.

Weigh the coffee, measure the tonic by volume and leave headroom.

Cold brew tonic guide: 120 g ready-to-drink coffee, 120 ml tonic and 100 g ice; tonic first, coffee slowly, then one gentle stir
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The 400 ml glass allows headroom; measure coffee, tonic and ice separately. Citrus is optional.

Choosing and Diluting the Cold Brew

Ready to drink: use 120 g (4.2 oz) directly. Choose unsweetened black coffee so the tonic's sugar remains the main sweetness input.

Concentrate: follow that product's dilution instructions with plain water, then weigh 120 g (4.2 oz) of the prepared coffee. Starbucks at Home, for example, gives equal volumes of its concentrate and water. Check the instructions for your own concentrate.

For homemade coffee, use the cold brew guide to brew and filter a batch first. Taste the chilled drinking-strength coffee before adding tonic. If the finished drink seems weak, increase the prepared coffee portion modestly on the next glass instead of switching blindly to undiluted concentrate.

Cold Brew Tonic Calories, Caffeine and Sugar

The named regular-tonic serving has an estimated 25 kcal and 6 g total sugar. For caffeine, use the chosen cold brew’s label and the amount poured; tonic adds no coffee caffeine. Light tonic changes the estimate as shown below and still contains sugar.

Cold Brew Tonic Calories, Caffeine and SugarScrollable table
Cold Brew Tonic Calories, Caffeine and Sugar
Same 120 g (4.2 oz) coffee + 120 ml (4.1 US fl oz) mixerEstimated drink energyTotal sugar
Q US Premium TonicAbout 25 kcalAbout 6 g, all added
Q US Light TonicAbout 10 kcalAbout 2.2 g, all added
Tonic-label and coffee-energy calculation

These ingredient estimates use the named tonic labels. Q's US can holds 222 ml (7.5 US fl oz) after rounded conversion. Its regular tonic labels 45 kcal and 11 g total sugar, all added; the Light version labels 20 kcal and 4 g total/added sugar.

Regular tonic contributes 45 × 120 ÷ 222 = 24.3 kcal and 11 × 120 ÷ 222 = 5.95 g sugar. Adding the generic coffee allowance gives 25.5 kcal. The Light version gives 12.0 kcal including coffee. Headline calories are rounded to the nearest five; package rounding and actual coffee composition limit precision. “Light” still contains sugar.

How much caffeine? Use your bottled cold brew’s label and the portion poured for a product-specific estimate. For comparison, USDA ordinary brewed coffee contains 40 mg per 100 g, or 48 mg in 120 g. That reference describes ordinary brewed coffee, not this cold brew.

Interactive Drink Tool

Use this tool to plan a homemade cold brew batch, then filter and prepare the coffee at drinking strength. Its input ratios and dilution suggestions are starting points; measure the filtered yield separately. It does not calculate this tonic serving or its caffeine.

Reader Tool

Cold Brew Batch Calculator

RatioGrindDilution

Editorial starting presets, measured by mass. This tool calculates coffee for the water you add. Measure the filtered coffee separately: grounds retain water, and serving size depends on dilution. Check your container and filter capacity before scaling up.

g
250g3000g

Water in grams. Decimals are welcome.

Brew style

Target batch

Simple 1:9 cold brew.

Input amounts

Recipe

Coffee

111.1g

Water

1000g

Steep

16 hr starting point

Ratio

1:9

Coffee: 111.1gWater: 1000g (33.8 US fl oz)Coffee amounts rounded to 0.1g. Ratio uses water added, not finished drink.
Brew note: Medium-coarse. Cover and steep in the refrigerator at 4°C / 40°F or below. Filter after the starting steep and keep the finished coffee covered and refrigerated.
Serving: Taste the filtered coffee first; add water or milk if needed and allow for ice melt.
Best for: Simple fridge coffee and black iced cups.

Next steps

  1. 1. Stir until every dry pocket is wet.
  2. 2. Start with 16 hours in the fridge; assess flavor after filtering and dilution.
  3. 3. Filter well and adjust strength in the glass.

Cold Brew Tonic Troubleshooting

Cold Brew Tonic Troubleshooting
Cold Brew Tonic Troubleshooting
ProblemUseful adjustment
Foam approaches the rimStop pouring, let it settle, then continue slowly; use the full 400 ml (13.5 US fl oz) glass capacity
Tonic tastes too sweetCompare the actual sugar labels or reduce tonic next time; citrus does not remove sugar
Too bitterTaste coffee and tonic separately to find which needs changing
Weak coffee flavorUse a fuller drinking-strength brew or slightly more prepared coffee; account for its caffeine separately
Flat drinkChill both liquids, open tonic just before use and avoid repeated stirring

Cold Brew Tonic Recipe Styles

Coffee producers publish different cold brew tonic recipes rather than one fixed standard. Illy's version includes cold brew, tonic, agave syrup and orange; our version leaves out the syrup and uses a coffee-last pour adapted from Q's espresso-tonic method. They show different ways to balance cold brew, tonic and sweetness.

Cold Brew Tonic vs. Espresso Tonic

Cold Brew Tonic vs Espresso TonicScrollable table
Cold Brew Tonic vs Espresso Tonic
DrinkCoffee baseWhat to check
Cold brew tonicPrepared cold brewReady-to-drink strength or correctly diluted concentrate
Espresso tonicA prepared espresso portionShot amount, cooling and space for foam
Coffee sodaPrepared coffee plus unsweetened sparkling waterSweetener is separate from the plain mixer

Keep the tonic and coffee quantities visible when comparing drinks. A larger cold brew serving can contain more caffeine than an espresso-based drink; the names alone cannot rank them.

Common Questions

Can I use concentrate straight from the bottle?
Only if you deliberately choose that stronger serving and account for its label. For this recipe, dilute concentrate as directed first, then weigh 120 g (4.2 oz) of ready-to-drink coffee.
Is cold brew tonic alcoholic?
The defined coffee, tonic and ice recipe contains no alcoholic ingredient. Tonic water itself is a mixer, not a spirit.
Can I use sugar-free tonic?
Yes. Recalculate using that product's label; light tonic is not necessarily sugar-free. The coffee contribution remains.
Can I make it in advance?
Prepare and chill the coffee ahead, following its storage directions. Assemble with freshly opened tonic just before serving so the bubbles remain.
Does tonic or coffee go in first?
For this home method, add ice and tonic first, then coffee slowly. Other producer recipes use a different order; headroom and gentle pouring matter.

Editor's Take

Sources and Further Reading

6 references

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