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Keto Calculator

Health

Calculate your daily keto macros — fat, protein, and net carbs in grams — based on your BMR, activity level, goal, and preferred keto style in seconds.

Reviewed by the thecalcu.com team · Last updated July 27, 2026

Gender
Age
yrs
1580
Weight
kg
30200
Height
cm
100250
Activity Level
Goal
Keto Style

Daily Calories — Standard Keto

—kcal/day
Fat
—
g/day
Protein
—
g/day
Net Carbs
—
g/day

What is a Keto Macros?

A keto calculator estimates the daily fat, protein, and net carbohydrate targets needed to follow a ketogenic diet, based on your body's actual energy requirements rather than a generic percentage guess. It starts with your Basal Metabolic Rate (BMR), the calories your body burns at rest, using the Mifflin-St Jeor equation, then scales that by your activity level to estimate your Total Daily Energy Expenditure (TDEE). From there, the calculator applies a ketogenic macro split, typically 70-75% fat, 20-25% protein, and 5-10% net carbs, and converts those percentages into concrete gram targets you can use for meal planning.

The ketogenic diet works by restricting carbohydrate intake enough, usually to 20-30 grams of net carbs per day, that the body shifts from burning glucose to burning fat and producing ketones for fuel, a metabolic state called nutritional ketosis. Getting the calorie and macro targets right matters: too much protein can interfere with ketosis for some people, while too few calories can undermine energy levels and training performance. This calculator is closely related to the TDEE Calculator, which produces the same underlying maintenance calorie number, and the Macro Calculator, which uses a more balanced (non-keto) macro ratio for general fitness goals.

Why Use a Keto Calculator?

Manually converting a keto percentage split (like 75/20/5) into grams of fat, protein, and carbs at your specific calorie level is tedious and easy to get wrong, especially when adjusting for a calorie deficit or surplus. This calculator does that conversion instantly and updates it whenever you change your activity level, goal, or preferred keto style, so you always have an accurate target to log against in a food-tracking app.

It's also useful for comparing keto styles side by side, someone doing regular resistance training may want the extra protein of the High-Protein Keto option, while someone newer to the diet may prefer the Standard Keto ratio. Pairing this with the Body Fat Calculator can help you track whether your chosen split and calorie target are producing the fat-loss or muscle-retention results you expect.

Who Should Use This Calculator?

People starting a ketogenic diet who need a starting point for daily fat, protein, and net carb grams rather than guessing at portion sizes. Weight-loss dieters who want their keto macros built around an actual calorie deficit instead of an arbitrary carb cutoff. Strength and resistance-training athletes following keto who need the higher protein allowance in the High-Protein Keto style to help preserve lean muscle mass.

People managing epilepsy or other conditions under medical guidance who need a reliable way to estimate macros before working with a dietitian to fine-tune the plan (always in consultation with a healthcare provider). Anyone tracking macros in a food app who wants gram-level targets that match a specific keto ratio rather than a generic 40/30/30 split, which is better suited to the Macro Calculator instead.

What Insights Does the Keto Macros Calculator Give You?

Daily Calories (kcal), your total daily calorie target after applying your selected goal (loss, maintenance, or gain) to your TDEE. This is the foundation number that all your macro grams are built from.

Fat (g/day), the largest macronutrient on a ketogenic diet, typically 65-75% of your calories. Since fat provides 9 calories per gram, this number will look large compared to a standard diet, that's expected and intentional.

Protein (g/day), set at a moderate level (20-30% depending on your chosen keto style) to support muscle maintenance without producing enough glucose through gluconeogenesis to interfere with ketosis for most people.

Net Carbs (g/day), capped in a practical 15-30 gram range, this is the number that matters most for staying in ketosis. It represents total carbohydrates minus fiber, which is how most keto tracking apps define "net carbs."

How to use this Keto Macros calculator

  1. Select your Gender using the male/female toggle at the top of the form.
  2. Adjust the Age, Weight, and Height sliders (or type exact values) to match your stats.
  3. Choose your Activity Level from the five option cards, each shows the multiplier and a description like "3–5 days/week exercise" to help you pick accurately.
  4. Choose your Goal, Weight Loss, Maintain, or Weight Gain, from the three goal buttons.
  5. Choose your Keto Style, Standard, High-Protein, or Targeted/Moderate, to set your fat/protein/net-carb ratio.
  6. Read your results in the result card: Daily Calories is shown large at the top, with Fat, Protein, and Net Carbs broken out in grams below it.
  7. Use the step-by-step breakdown underneath the results to see exactly how your BMR, TDEE, and final macro grams were calculated.
Show formula & methodology ↓Show less ↑

Formula & Methodology

Step 1, BMR (Mifflin-St Jeor equation):

For men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5
For women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Step 2, TDEE (maintenance calories):

TDEE = BMR × activity multiplier, where the multiplier ranges from 1.2 (sedentary) to 1.9 (extremely active).

Step 3, Goal-adjusted daily calories:

Daily Calories = TDEE − 500 (weight loss), TDEE (maintenance), or TDEE + 300 (weight gain), floored at a minimum of 1,200 kcal/day.

Step 4, Keto macro split:

Fat (g) = (Daily Calories × fat%) ÷ 9
Protein (g) = (Daily Calories × protein%) ÷ 4
Net Carbs (g) = (Daily Calories × carb%) ÷ 4, capped to a 15-30 g/day range.

Worked example: A 30-year-old male, 80 kg, 178 cm, moderately active, on a weight-loss goal with Standard Keto: BMR ≈ 1,798 kcal → TDEE ≈ 2,787 kcal → Daily Calories ≈ 2,287 kcal → Fat ≈ 191 g, Protein ≈ 114 g, Net Carbs ≈ 29 g (capped).

Frequently Asked Questions

What is the keto calculator and how does it work?
The keto calculator estimates your daily calorie needs using the Mifflin-St Jeor BMR formula, then splits those calories into a high-fat, moderate-protein, low-carb ratio suited to the ketogenic diet. You enter your gender, age, weight, height, activity level, and goal, and the tool converts your total daily calories into grams of fat, protein, and net carbs. It removes the guesswork of manually converting percentages into gram targets for each macronutrient.
What is the ideal macro split for a ketogenic diet?
Standard keto is typically around 70-75% of calories from fat, 20-25% from protein, and 5-10% from net carbs. This calculator offers three preset styles, Standard Keto, High-Protein Keto, and Targeted/Moderate Keto, so you can match the split to your training intensity and muscle-preservation goals. Net carbs are capped in a practical 15-30 gram per day range regardless of total calories, since that is the range most people need to reach and maintain ketosis.
How many net carbs can I eat and still stay in ketosis?
Most people enter and stay in nutritional ketosis eating between 20 and 30 grams of net carbs per day, though some individuals need to go lower and others have more metabolic flexibility. Net carbs are calculated as total carbohydrates minus fiber (and minus sugar alcohols, for products that contain them), since fiber is not digested into glucose. This calculator caps its net carb recommendation within that 15-30 gram range so the number stays actionable no matter how many total calories you are eating.
What is the difference between net carbs and total carbs?
Total carbs include everything on the nutrition label under carbohydrates, while net carbs subtract fiber and, in many tracking approaches, sugar alcohols like erythritol. Because fiber does not raise blood glucose or interfere with ketosis, most keto trackers use net carbs as the number that matters for staying in a fat-burning state. This calculator's carb output is a net carb target, not a total carb target.
What is the difference between the Keto Calculator and the Macro Calculator?
The [Macro Calculator](/macro-calculator/) produces a general-purpose protein, carb, and fat split for any diet style, with carb percentages in the 35-40% range. The Keto Calculator is purpose-built for the ketogenic diet, capping net carbs at a strict 15-30 grams per day and shifting the bulk of calories to fat rather than carbohydrate. If you are not following a ketogenic diet, the Macro Calculator's balanced split is the more appropriate tool.
Should I use Standard, High-Protein, or Targeted Keto?
Standard Keto (75% fat / 20% protein / 5% net carbs) suits most people starting out and prioritizes fat-adaptation. High-Protein Keto (65% fat / 30% protein / 5% net carbs) is better for people doing resistance training who want to preserve or build lean muscle while in ketosis. Targeted/Moderate Keto (70% fat / 25% protein / 5% net carbs) is a middle-ground option for people who are moderately active and want a bit more protein without fully departing from a classic keto ratio.
How do I use the keto calculator?
Enter your gender, age, weight, and height, then select your activity level, goal, and preferred keto style from the option cards. The calculator updates instantly and shows your daily calorie target along with fat, protein, and net carb grams. You can adjust any field to see how the numbers shift, and the URL updates automatically so you can bookmark or share your specific result.
Can I use this calculator for weight loss on keto?
Yes, select 'Weight Loss' as your goal and the calculator applies a 500 kcal daily deficit to your maintenance calories (TDEE) before splitting the result into keto macros. This produces a lower calorie target while keeping the same fat, protein, and net carb ratios, which is the standard approach for a ketogenic weight-loss diet. A 500 kcal daily deficit corresponds to roughly one pound (0.45 kg) of fat loss per week.
What is BMR and how does it factor into my keto macros?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest just to maintain basic functions like breathing and circulation. This calculator computes your BMR with the Mifflin-St Jeor equation, then multiplies it by an activity factor to estimate your Total Daily Energy Expenditure (TDEE), the calorie baseline your keto macros are built from. You can see this full breakdown in the [BMR Calculator](/bmr-calculator/) and [TDEE Calculator](/tdee-calculator/) if you want the intermediate numbers on their own.
Why is my keto calculator fat gram target so high?
On a ketogenic diet, fat supplies the majority of your calories, 70-75% in a standard split, because carbohydrate intake is deliberately restricted to keep the body burning fat and ketones for fuel instead of glucose. Since fat contains 9 calories per gram versus 4 calories per gram for protein or carbs, a large percentage of calories translates into a larger gram number than people expect coming from a standard diet. This is expected and by design; it is not a sign of an error in the calculation.
Is the ketogenic diet safe for everyone?
The ketogenic diet is not appropriate for everyone, including people with certain metabolic conditions, a history of pancreatitis, or those on medications like SGLT2 inhibitors or insulin without medical supervision. This calculator provides macro targets based on standard formulas and does not account for individual medical history, so anyone considering a ketogenic diet should consult a healthcare provider or registered dietitian first, especially if pregnant, nursing, or managing a chronic condition.
How is this calculator different from a general TDEE or calorie calculator?
The [TDEE Calculator](/tdee-calculator/) and [Calorie Calculator](/calorie-calculator/) tell you your total daily calorie needs but do not break those calories into a specific macronutrient ratio. The Keto Calculator takes that same calorie baseline and applies a ketogenic-specific split, high fat, moderate protein, capped net carbs, so you get gram targets ready to use for meal planning and tracking, rather than just a single calorie number.
Also known as
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