Butter is a staple of keto and low-carb eating, but it isn't always exactly zero-carb. Standard salted and unsalted butter contain a tiny amount of carbohydrate — about 0.06 g per 100 g — while ghee is usually carb-free and lighter butter spreads can carry more. This calculator lets you work out the precise carbs in whatever butter serving you're adding to your meal.
Whether you measure in tablespoons, teaspoons, cups, sticks, or grams, the tool converts your portion to grams, applies the carb value, and shows the total in both grams and milligrams. You can pick a butter type or enter the exact “carbs per 100 g” number from your label for a custom product. Quick preset buttons make it easy to check common serving sizes.
Use this tool for macro tracking, keto meal prep, low-carb baking, or any diet where every carbohydrate counts. It's also a nice way to see why butter doesn't break a ketogenic state.
🧈 Butter Carbs Calculator
Work out the carbohydrate content of any butter serving — whether it's a pat, a tablespoon, or a whole block.
How to Use This Tool
Start by entering the amount of butter you plan to eat. Pick a unit from the dropdown (tablespoon, teaspoon, stick, cup, or gram), then choose a butter type. The calculator uses an average carb value for each type, but you can override it by typing an exact value from your product's nutrition label into the “carbs per 100 g” field. Click Calculate carbs and you'll get the total carbohydrate content of your serving, plus a short breakdown showing how the number was derived. The preset buttons are handy for quick checks of common serving sizes like one tablespoon or one stick.
Example: 2 tablespoons of salted butter = 2 × 14.2 g = 28.4 g. At 0.06 g carbs per 100 g, that works out to 28.4 × 0.06 ÷ 100 = 0.017 g carbs, or about 17 mg. For most keto trackers that's effectively zero.
Butter Carb Content at a Glance
These values are based on generic USDA entries for butter and typical light butter spreads. Always check your own label if you're being strict.
| Butter type | Carbs per 100 g | Carbs per tbsp (14 g) |
|---|---|---|
| Salted butter | 0.06 g | ≈ 0.008 g |
| Unsalted butter | 0.06 g | ≈ 0.008 g |
| Ghee | 0 g | 0 g |
| Whipped butter | 0.06 g | ≈ 0.008 g |
| Light / reduced-fat butter | 1.5 g (typical) | ≈ 0.21 g |
Values rounded from USDA FoodData Central reference data; commercial light butters can vary from 0.5 g to 3+ g per 100 g.
Why Does Butter Have Carbs?
Butter is mainly milk fat and water, but it also contains a small amount of milk solids — the lactose and proteins left behind during churning. Lactose is a sugar, and because it's a carbohydrate, standard butter carries a tiny carbohydrate payload. The amount is so small that many nutrition labels round it down to 0 g.
Ghee takes this a step further: it's clarified butter with the water and milk solids removed, so it's effectively carb-free. Light or reduced-fat butter is a different story. To make up for less fat, manufacturers add extra water, whey, milk solids, stabilizers, and sometimes even a little sugar or maltodextrin. That's why light butter spreads often have noticeably more carbs than regular butter.
Tips for Low-Carb & Keto Diets
- Don't fear real butter. Even a generous 100 g serving of salted butter contains only about 0.06 g carbs — far below what most ketogenic dieters track.
- Watch the spreads. Margarine-like “butter” spreads, or products labelled “light butter”, can contain higher carbohydrate counts. Read the ingredient list and nutrition panel before assuming they're keto-friendly.
- Weigh for accuracy. Volume measurements like tablespoons are convenient, but gram weights from a kitchen scale improve precision, especially when calorie and carb counts are important.
- Whipped butter has air. Whipped butter has the same carbs by weight, but a tablespoon contains less butter because of the incorporated air — so the carbs per tablespoon are slightly lower than for regular butter.
- Try ghee for strict tracking. Ghee contains no lactose and no carbs, and it also has a higher smoke point for cooking. If you want to be as close to zero as possible, ghee is your best dairy choice.
Be careful: Butter-flavoured spreads and “light butter” products are not the same as pure butter — they can contain added sugar or maltodextrin. Always scan the ingredient list when following a strict low-carb diet.
If you're also keeping an eye on energy intake, pair this tool with our Butter Calorie Calculator to see how much fat and calories your butter adds to your meal.
Frequently Asked Questions
Does butter break ketosis?
No. The trace carbohydrates in pure butter are negligible for almost all ketogenic diets. A typical single serving — one tablespoon — contains under 0.01 g net carbs.
Is ghee better than butter for low carb?
Ghee has zero carbs and zero lactose, making it a slightly “cleaner” option on paper. In practice, both are fine for low-carb eating. Ghee also works better for frying because it has a higher smoke point.
How many carbs in a stick of butter?
A standard U.S. butter stick weighs 113 g. With 0.06 g carbs per 100 g, a whole stick has roughly 113 × 0.06 ÷ 100 = 0.068 g carbs — about 68 mg. That's still essentially zero.
Do salted and unsalted butter have different carb counts?
The salt content doesn't affect carbohydrates. Both typically contain about 0.06 g carbs per 100 g. If your label rounds to 0, that's expected.
Limitations & Precision Notes
The numbers here come from standard USDA food composition data. Real-world butter varies slightly by brand, season, and cow's diet, but the carb content is consistently minuscule. Light butter products, however, vary enormously. A “light butter” from one brand may contain 0.5 g per 100 g, while another contains 3 g. If you're counting strictly, use the customizable “carbs per 100 g” field with the value printed on the product's label.
Net carbs equal total carbs for all dairy butters because they contain no fiber. For products with added stabilizers or fiber, check the label to see whether dietary fiber should be subtracted.
Additional Resources
- USDA FoodData Central — search for “butter” to view official nutrient profiles.
- Dietary Guidelines for Americans — dietary guidance and food group recommendations.
- Academy of Nutrition and Dietetics — resources on healthy eating and macronutrients.