Bulletproof Coffee (Classic Keto Coffee)

Bulletproof coffee has 0 g net carbs per serving and takes about five minutes to make. It's hot coffee blended with unsalted grass-fed butter and MCT oil until the top turns foamy, like a latte with no milk. One cup runs about 330 calories and 37 g of fat, which is why it's become a staple keto breakfast for people who want a high-fat, low-effort start to the day.

This is the classic version, not a shortcut — just three ingredients and a blender. If you want the full breakdown of which coffee add-ins keep you in ketosis and which ones don't, see our keto coffee guide; this page is the actual recipe.

Why does bulletproof coffee work on keto?

Coffee, unsalted butter, and MCT oil each carry 0 g of carbohydrate, so a cup of bulletproof coffee has 0 g net carbs regardless of how much butter or oil you use.¹ What it does add is fat — a lot of it, fast, in liquid form — which is why the drink shows up so often in keto breakfast routines and intermittent-fasting windows.

The MCT oil is doing more than the butter here. Medium-chain triglycerides are absorbed and converted to ketones faster than the long-chain fats in butter or olive oil, and a small controlled study found that pairing caffeine with MCTs raised blood ketone levels more than either one alone.² Caffeine itself has also been linked to a modest, short-term bump in fat oxidation in exercise studies, though the effect is small and varies by person.³

What ingredients do you need for bulletproof coffee?

• 1 cup (8 oz) hot brewed coffee — 0 g net carbs. Use a fresh, hot brew; a lukewarm cup won't blend into foam as well.
• 1 to 2 tablespoons unsalted grass-fed butter (or ghee) — 0 g net carbs. Unsalted keeps the flavor clean; ghee works if you're sensitive to dairy proteins.
• 1 tablespoon MCT oil (or virgin coconut oil) — 0 g net carbs. Start with 1 tablespoon if you're new to MCT oil — it can upset a sensitive stomach in larger amounts.
• Pinch of sea salt (optional) — 0 g net carbs. Rounds out the flavor and adds a little sodium, useful in the first weeks of keto.
• 1/2 teaspoon cinnamon or a few drops of liquid stevia (optional) — effectively 0 g net carbs at this amount.

All three core ingredients are on the approved list in our keto food list, so this recipe fits any standard keto macro split without adjustment.

How do you make bulletproof coffee?

Brew the coffee hot, blend it with butter and MCT oil for 20 to 30 seconds, and drink it immediately while it's still frothy. A regular spoon-stir will not emulsify the fat — you need a blender (or a milk frother) to get the latte-like foam.

1. Brew the coffee. Brew 1 cup of hot, strong coffee using your usual method — drip, French press, pour-over, or espresso topped up with hot water.
2. Add the fats. Pour the hot coffee into a blender cup and add the butter and MCT oil (plus salt, cinnamon, or stevia if using).
3. Blend until frothy. Blend on high for 20 to 30 seconds. You'll know it's done when the surface is foamy and there's no separate oil slick floating on top.
4. Serve immediately. Pour into a mug and drink right away — bulletproof coffee separates as it cools, so it's best fresh off the blender.

What are the nutrition facts for bulletproof coffee?

One serving of bulletproof coffee (1 cup, made with 2 tablespoons butter and 1 tablespoon MCT oil) has about 330 calories, 37 g fat, under 1 g protein, and 0 g net carbs. The fat content is the whole point — it's designed to be calorie-dense and satiating, not a low-calorie drink, which is also why most dietitians suggest treating it as an occasional breakfast rather than a daily habit.⁴

Nutrient	Per serving
Calories	~330 kcal
Total fat	~37 g
Saturated fat	~22 g
Total carbohydrate	0 g
Fiber	0 g
Net carbs	0 g
Protein	under 1 g

Using 1 tablespoon of butter instead of 2 cuts roughly 100 calories and 11 g of fat. Compare the serving values in the table with an existing plan. If you add ingredients, recalculate the recipe from their labels or reliable food-composition data; neither site calculator accepts a recipe or decides how it fits a daily target.

What variations and swaps work for bulletproof coffee?

The base recipe (coffee, butter, MCT oil) is the template — swap the fat source, add flavor, or dial the amounts up or down to fit your goals. A few reliable variations:

• Dairy-free: Use virgin coconut oil instead of butter for a fully plant-based version with a mild coconut note.
• Mocha version: Blend in 1 tablespoon unsweetened cocoa powder for a chocolate-forward cup (adds under 1 g net carb).
• Vanilla or cinnamon latte: Add 1/2 teaspoon vanilla extract or cinnamon before blending — both are effectively carb-free at this amount.
• Lighter version: Drop to 1 tablespoon butter and skip the MCT oil, or use just 1 teaspoon MCT oil, if 330 calories is more than you want first thing in the morning.
• Protein boost: Blend in a scoop of unflavored collagen or whey isolate for a few grams of protein; check the label, since some brands add carb-heavy fillers.

For other breakfast, lunch, and dinner ideas, use the meal template builder. It does not accept bulletproof coffee as a custom item or keep a daily macro target on track.

How do you store bulletproof coffee?

Bulletproof coffee is best made fresh and drunk within a few minutes — it separates into a layer of oil once it cools, and reheating doesn't re-emulsify it well. If you need to prep ahead, store the butter and MCT oil pre-portioned in a small container and blend them into hot coffee to order rather than trying to batch and refrigerate the finished drink.

Frequently Asked Questions

Does bulletproof coffee break a fast?

It contains calories, so strictly speaking it ends a zero-calorie fast. Because it has virtually no protein or carbs, many low-carb dieters use it during a fasting window without a large insulin response, but whether that fits your specific fasting protocol is worth checking against your own goals.

How many net carbs are in bulletproof coffee?

About 0 g net carbs per serving. Coffee, butter, and MCT oil all carry essentially no carbohydrate, so the drink stays keto regardless of portion size.

Can I use regular butter instead of grass-fed?

Yes. The macros are nearly identical — grass-fed butter has a slightly different fatty-acid and micronutrient profile, but both are 0 g net carbs and work the same in the recipe.

What can I use instead of MCT oil?

Virgin coconut oil is the most common swap. It has a similar fat content but a lower share of medium-chain triglycerides, so it blends into slightly less foam and won't raise ketones quite as quickly.

Is bulletproof coffee good for weight loss?

It may help some people feel full through the morning, but it is calorie-dense — around 330 calories per cup — and isn't a proven weight-loss tool on its own. Treat it as a high-fat breakfast that counts toward your daily calories, not a free pass.

Works cited

1. Coffee, brewed, nutrition facts — MyFoodData (USDA FoodData Central) — August 19, 2026 https://tools.myfooddata.com/nutrition-facts/171890/wt3
2. Short-Term Influence of Caffeine and Medium-Chain Triglycerides on Ketogenesis: A Controlled Double-Blind Intervention Study — PMC, National Library of Medicine — August 19, 2026 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8221889/
3. Effect of Acute Caffeine Intake on the Fat Oxidation Rate during Exercise: A Systematic Review and Meta-Analysis — PMC, National Library of Medicine — August 19, 2026 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7760526/
4. Why Bulletproof Coffee Shouldn't Be an Everyday Drink — Cleveland Clinic — August 19, 2026 https://health.clevelandclinic.org/bulletproof-coffee

Article history

1. August 23, 2026Updated
2. August 19, 2026First published