Fitness and Nutrition Calculator

Forge Fitness and Nutrition Calculator

Estimate your basal metabolic rate, daily calorie expenditure, goal-based calorie intake, protein targets, and a realistic timeline for weight loss or muscle gain.

Units

US Units Metric

Sex

Male Female

Current Body Data

Age

years

Activity Level

Height

Current Weight

Goal Type

Lose Fat Maintain Gain Muscle

Desired Goal Change

Desired Weight Loss or Gain

This estimated timeline is intentionally realistic, not fantasy-based.

Basal Metabolic Rate

1,850

Estimated calories your body burns at complete rest.

Total Daily Energy Expenditure

2,868

Estimated calories burned per day based on your current activity level.

Goal Calories

2,368 kcal

Protein Target

171–209 g

Weekly Pace

1.0 lb/week

Estimated Timeline

15 weeks

A moderate calorie deficit is shown for body fat loss while keeping expectations realistic.

Suggested Calorie Targets

Maintenance Estimated intake to maintain current body weight.

2,868 kcal

Fat Loss Moderate deficit designed for sustainable progress.

2,368 kcal

Muscle Gain Controlled surplus to support lean tissue gain.

3,118 kcal

Important note: BMR and TDEE calculators are estimates. Real-world calorie needs vary based on lean body mass, NEAT, training quality, hormone status, recovery, stress, and metabolic adaptation. The timeline shown is a realistic estimate, not a promise.

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What This Calculator Actually Tells You

This calculator estimates your basal metabolic rate (BMR), total daily energy expenditure (TDEE), calorie targets, protein intake, and a realistic timeline to reach your goal.

How BMR and TDEE Are Calculated

Your BMR is calculated using the Mifflin-St Jeor equation, one of the most widely accepted formulas for estimating metabolic rate. Your TDEE is then derived by factoring in your activity level.

What Most Calculators Get Wrong

Most calculators give you a number and leave you guessing. They don’t account for realistic timelines, adherence, or how the body actually adapts. This one does.

Realistic Fat Loss and Muscle Gain

Fat loss: ~0.5–1 lb per week – Muscle gain: slower than people expect – Timeline matters more than intensity

How to Use These Numbers in Real Life

Start with calculated calories – Adjust weekly – Track body weight trends – Stay consistent

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