How to Calculate Your Daily Calories and Macros
Whether you want to lose, gain or maintain, it starts with two numbers: how many calories you burn and how you split them. Here is the simple version.
By ToolJolt Team · June 1, 2026
BMR: what you burn at rest
Your Basal Metabolic Rate is the energy your body uses just to stay alive — breathing, circulation, keeping warm. It depends mainly on your weight, height, age and sex, and it is the foundation of every calorie target.
TDEE: what you actually burn
Total Daily Energy Expenditure is BMR multiplied by an activity factor. A desk job with little exercise might be BMR × 1.2; a very active person × 1.7 or more. TDEE is the number of calories that keeps your weight stable.
Set a target for your goal
- Maintain — eat around your TDEE.
- Lose fat — eat 10–20% below TDEE (a sustainable deficit).
- Gain muscle — eat 5–15% above TDEE, paired with training.
Splitting into macros
Once you have a calorie target, divide it into protein, carbohydrate and fat. A common starting point is 25–35% protein, 30–40% carbs and 25–35% fat, then adjust to how you feel and perform. Protein matters most when losing fat, because it preserves muscle and keeps you full.
Get your numbers
ToolJolt's calorie calculator estimates your needs instantly; pair it with the BMI calculator for context. Use them as a starting point and adjust based on real-world results over a few weeks.
Free tools mentioned in this guide
Frequently asked questions
How big should a calorie deficit be?
10–20% below your TDEE is sustainable for most people — roughly 300–600 calories. Bigger deficits work short-term but are harder to maintain and can cost muscle.
How much protein do I need?
A common range is 1.6–2.2 g per kg of body weight, especially when losing fat or building muscle. The calculator gives a starting estimate you can refine.
Why is the scale not moving on my target?
Estimates are averages; your real burn may differ. Track for 2–3 weeks and adjust calories up or down by ~10% based on the trend.