Home > Calc > Calorie & Macro Calculator

Other Tools

Circle CalculatorCylinder Volume CalculatorRectangular Prism Volume & Surface Area CalculatorDecimal to Fraction ConverterBMI CalculatorMath Expression CalculatorOnline Base Converter ToolByte ConverterDownload Time CalculatorIP Address & Subnet Mask Calculator

Calorie & Macro Calculator

Estimate your daily calories and macronutrient targets based on age, body data, activity level and fitness goal.

Daily intake: 50% carbs / 25% protein / 25% fat

Tool Overview: Calorie & Macro Calculator

Plan your daily energy intake with a quick breakdown of calories and macronutrients. Enter your age, height, weight, activity level and goal to get an estimated target for maintenance, fat loss or muscle gain.

What Is Calorie & Macro Calculator?

Calorie & Macro Calculator calculates results from your inputs for quick checks.

How to Use

  1. Enter the required values.
  2. Select units or conditions.
  3. Calculate and review the result.

Common Use Cases

  • Formula checks for study
  • Quick estimates for design/engineering
  • Daily calculations and verification

❓ FAQ

Q1: Is the result precise?
A: Adjust decimal places as needed.

Q2: Units mismatch?
A: Convert units before calculating.

Q3: What ranges are supported?
A: Best for common, practical ranges.

How the numbers are calculated

  • BMR (Basal Metabolic Rate) uses the Mifflin-St Jeor equation:
    BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + s where s = 5 for men and s = -161 for women.
  • TDEE (Total Daily Energy Expenditure) multiplies BMR by an activity factor that reflects your lifestyle or weekly training volume.
  • Goal calories adjust TDEE with a moderate surplus or deficit. The calculator safeguards against extreme deficits by keeping the target above ~85% of BMR.
  • Macro distribution converts calories into grams with the standard conversions: carbs and protein at 4 kcal per gram, fat at 9 kcal per gram.

Activity multipliers

Level Multiplier Typical routine
Sedentary 1.2 Desk work, almost no exercise
Light 1.375 Light exercise 1–3 times per week
Moderate 1.55 Moderate training 3–5 times per week
Active 1.725 Hard training 6–7 times per week
Very active 1.9 Physically demanding work or two-a-days
Athlete 2.1 Competitive or professional level training twice daily

Goal presets

  • Maintain weight → keeps calories at TDEE.
  • Slow fat loss → roughly 250 kcal below TDEE (~0.25–0.3 kg/week).
  • Standard fat loss → roughly 500 kcal below TDEE (~0.5 kg/week).
  • Aggressive fat loss → roughly 750 kcal below TDEE; short-term use only.
  • Slow muscle gain → roughly 250 kcal above TDEE.
  • Muscle gain → roughly 500 kcal above TDEE.

Tip: The projected weekly change is an estimate based on 7,700 kcal ≈ 1 kg of body mass. Individual responses vary.

Macro presets

  • Balanced: 50% carbs / 25% protein / 25% fat – a classic all-round profile.
  • Lower carb: 30% carbs / 35% protein / 35% fat – suitable for low-carb or ketogenic transitions.
  • Higher protein: 35% carbs / 35% protein / 30% fat – supports body recomposition or strength phases.
  • Custom: Set your own percentages; the tool validates that they sum to 100%.

Usage checklist

  1. Confirm the correct unit system for height (cm or inches) and weight (kg or lb).
  2. Select the activity option that best matches your weekly routine, not just your job title.
  3. Choose a macro preset or customise the ratio if you already follow a nutrition protocol.
  4. Review the history list to compare different scenarios (e.g., maintenance vs. deficit).

Nutritional reminders

  • Recalculate after significant weight changes; energy needs shift as body mass changes.
  • Extremely low calorie targets can be unsustainable—consider consulting a professional for personalised guidance.
  • Combine the plan with adequate sleep, hydration and micronutrient-dense foods for best results.