To track macros on keto, set a daily carbohydrate limit (usually 20 to 50 g), a protein target based on your body weight, and let fat fill the rest of your energy. Then log what you eat in an app or notebook for 2 to 4 weeks, weighing foods that are easy to misjudge, such as nuts, cheese, oils and berries. After that, most people can estimate without logging every meal. Tracking is a learning tool, not something you need to do forever, and it isn’t right for everyone.
What you’re tracking
Keto plans usually get 70 to 80% of calories from fat, 10 to 20% from protein and 5 to 10% from carbohydrate, according to Harvard’s Nutrition Source. In practice, it’s easier to work in grams:
- Carbohydrate: a fixed daily limit, often 20 g of net carbs for a strict plan or up to 50 g for a more relaxed one.
- Protein: at least the official minimum of 0.8 g per kg of body weight a day (0.36 g per lb), as Harvard Health explains. A registered dietitian can help you set a figure for your age, activity and health.
- Fat: the remaining calories. Most people don’t need to hit a fat target exactly.
Our guide to keto macros explains the ranges in more detail.
Step 1: Choose a tracking method
| Method | Good for | Watch out for |
|---|---|---|
| Food tracking app | Quick logging, barcode scanning, daily totals | User-added entries can be wrong; check them against the label |
| Notebook or spreadsheet | People who prefer not to use apps | Takes longer to add up |
| Photos of meals | A light-touch record of what you ate | No numbers unless you add them later |
Whichever you choose, use it consistently for a few weeks.
Step 2: Get the right numbers for your foods
Use the nutrition label on packaged foods. For fresh foods, use a reliable database such as USDA FoodData Central. Values in apps sometimes come from other users and can be wrong, so compare a few common foods with the label or the USDA figures.
If you count net carbs, subtract fiber from total carbohydrate. On US labels, fiber is included in total carbohydrate, while on EU and UK labels it’s already excluded. Our guide to calculating net carbs explains the difference.
Step 3: Weigh the tricky foods
Some foods are easy to underestimate:
| Food | Why it’s tricky | Example, per USDA values |
|---|---|---|
| Nuts | Small volume, many calories | 30 g of almonds has about 174 calories and 2.7 g of net carbs |
| Cheese | Easy to cut a large slice | 30 g of cheddar has about 121 calories |
| Oils | A “drizzle” is often a tablespoon or more | 1 tablespoon (13.5 g) of olive oil has about 119 calories |
| Berries | Handfuls vary a lot | 100 g of strawberries has about 5.7 g of net carbs |
Values calculated from USDA FoodData Central. A cheap kitchen scale makes a big difference for the first few weeks.
Step 4: Log for 2 to 4 weeks, then step back
The point of tracking is to learn what a 20 g or 40 g carb day looks like on your plate. After a few weeks, most people can build meals by eye: a palm-sized portion of protein, a plate half-full of vegetables, a thumb of fat, and berries or nuts in measured portions.
Some people return to tracking for a week every few months, or when progress stalls, as a check-in.
A worked example
Say you weigh 70 kg (154 lb) and choose a 25 g net carb limit:
- Protein minimum: 70 × 0.8 = 56 g a day.
- Carbohydrate: 25 g of net carbs a day.
- Fat: the rest of your energy needs. If your total is about 1,900 calories, protein provides about 224 calories (56 × 4) and carbohydrate about 100 (25 × 4), leaving about 1,576 calories, or roughly 175 g of fat.
Use these as starting points, not rules. If you’re losing weight faster than planned, feel weak, or are hungry all the time, adjust with your doctor or dietitian.
Common tracking mistakes
- Forgetting drinks, sauces and cooking oil. Milk in coffee and dressing on salads add up.
- Logging “a handful” or “a splash” instead of weighing or measuring.
- Ignoring serving sizes on labels, which are often smaller than what you eat.
- Chasing perfect numbers. A few grams over isn’t a failure.
- Using the wrong carbohydrate figure, mixing up total and net carbs.
When tracking isn’t a good idea
For some people, counting every gram can become stressful or obsessive. If tracking makes you anxious about food, leads you to skip meals, or takes over your day, stop and talk to your doctor or a dietitian. That’s especially important if you have a history of disordered eating. An eating disorder is serious but treatable, and if you need someone to talk to now, findahelpline.com lists free, confidential helplines in many countries.
There are other ways to follow a low-carb diet, such as building meals from a list of low-carb foods without counting. Our keto food list works well for that.
Common questions
Do I need to track calories too?
Not always. On keto, many people focus on carbohydrate and protein and let fat fill the rest. If your weight isn’t changing the way you expect, tracking total calories for a couple of weeks can show why.
Which app should I use?
Any app that lets you log grams and shows total carbohydrate, fiber and protein will work. Check a few of its entries against food labels or USDA values.
How accurate do I need to be?
Reasonably accurate, not perfect. Weighing high-calorie foods for a few weeks gets you most of the benefit.
Before you start
Safety note: A ketogenic diet isn’t safe for everyone. Don’t start one without medical supervision if you have type 1 diabetes, take insulin or other diabetes medicines (especially SGLT2 inhibitors such as empagliflozin or dapagliflozin), take medicine for high blood pressure, have kidney, liver, pancreas or gallbladder disease, are underweight or have had an eating disorder, or are pregnant or breastfeeding. Children should only follow keto as a medical treatment run by a specialist team. A 2026 review of keto’s contraindications lists these and other situations that need care, so talk to your doctor first if any apply to you.
This article is general information, not medical advice. Talk to your doctor or a registered dietitian before making big changes to how you eat, especially if you have a health condition, take regular medication, or are pregnant or breastfeeding.
