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Low-Carb Diet Calculator 2026
Pick your carb level and get daily grams for carbs, protein and fat.
A low-carb diet calculator is a tool that converts a carbohydrate percentage of your daily calories into grams, alongside suggested protein and fat amounts. Common bands are moderate low-carb at about 30% of calories, low at 20%, very low at 10% and ketogenic at about 5%.
Start Calculating ↓Your low-carb gram targets
Net-carb guidance: subtract your fibre from total carbs. With a typical 15–25g of fibre per day, net carbs would be roughly 75–85g if you eat within this total.
About the Low-Carb Diet Calculator
Enter your daily calories and choose a band to see your gram targets. Net carbs — total carbs minus fibre — are what many low-carb eaters track; with a typical 15–25g of fibre per day, your net-carb figure will be that much lower than the total shown here.
Low-Carb Diet Calculator: Key Facts to Know
- ✓ Carb bands used here: moderate 30%, low 20%, very low 10%, keto 5% of calories.
- ✓ At 2,000 kcal, 20% carbs = 100g per day; 5% = 25g per day.
- ✓ Net carbs = total carbs − fibre; typical fibre intake of 15–25g/day lowers net carbs by that amount.
- ✓ Protein is set at 30% of calories here (25% on the keto band) and fat fills the remainder.
- ✓ Cut added sugar, refined grains and starchy sides first — they dominate carb intake for most people.
Results from the Low-Carb Diet Calculator are estimates for general educational use on Smoothie Nutrition Calculator. They are not medical or dietetic advice — for personal medical nutrition questions, including pregnancy, diabetes and clinical nutrition such as TPN, always work with your doctor or a registered dietitian.
Frequently Asked Questions
Definitions vary. Common bands are under 30% of calories for moderate low-carb, around 20% for low, 10% for very low and about 5% (20–50g) for ketogenic diets.
Low-Carb Diet Calculator Guides & Articles
All 4 of our guides for this calculator — every one built on the same data as the tool above.
Low-Carb Diet Calculator 2026 | Low Carb
A low-carb diet calculator is a tool that converts a carbohydrate percentage of your daily calories into grams, alongside suggested protein and fat amounts. Common bands are moderate low-carb at about 30% of calories, low at 20%, very low at 10% and ketogenic at about 5%.
Read guide →
🥩Low-Carb Diet Calculator 2026 | Low Carb Tips Mistakes
Most wrong results from the Low-Carb Diet Calculator come from input mistakes, not the maths. Here are the five that matter most — and the fix for each.
Read guide →
🥩Low-Carb Diet Calculator 2026 | Low Carb Deep Dive
Beyond the basics: the reference values, assumptions and limits behind the Low-Carb Diet Calculator, and how dietitians sanity-check its results.
Read guide →
🥩Low-Carb Diet Calculator 2026 | Low Carb Worked Examples
Numbers land differently in context. Three everyday scenarios run through the Low-Carb Diet Calculator, with the input that mattered most in each.
Read guide →
More Nutrition Calculators
Every calculator on Smoothie Nutrition Calculator works the same way — pick from the dropdowns and see live totals.