Quick TDEE
🇺🇸 en
Select Regional Edition
🇺🇸
English (US / Global) US, UK, CA, AU, NZ, IE
🇩🇪
Deutsch (DE / AT / CH) Deutschland, Österreich, Schweiz
🇫🇷
Français (FR / CA / CH) France, Canada (QC), Suisse, Belgique
🇪🇸
Español (ES / LatAm) España, Estados Unidos (Hispano), México
🇮🇹
Italiano (IT / CH) Italia, Svizzera Italiana
METABOLIC ADAPTATION RECOVERY • ZERO SIGNUP

Reverse Dieting Calculator & Metabolic Recovery Engine

Structure a phased, weekly caloric ramp to restore metabolic hormones, elevate daily energy, and exit your deficit without rapid fat rebound.

Formula: Mifflin-St Jeor

1. Physical Profile

Step 1 of 2
28 years
175 lbs (79.4 kg)
lbs
5 ft 10 in (178 cm)
ft
in

2. Smart Activity Wizard

Multiplier: 1.500
Desk Job (1.15 base) + 3–4 Workouts/wk (+0.25)

Calculates total energy expenditure without the 30% overestimation error of standard activity dropdowns.

Ideal Body Weight Matrix

Clinical reference benchmarks
Reference
Devine (1974) 161 lbs Medical standard
Robinson (1983) 156 lbs Modern clinical
Hamwi (1964) 166 lbs Rule of thumb
Max Muscular 172 lbs At 8-10% drug-free

Standard formulas estimate healthy body weight based on height and frame. Athletic individuals with high muscle mass naturally exceed these ranges without elevated adiposity.

Energy Anatomy (TDEE)

4-Part metabolic burn model
Breakdown
TDEE Component Split 2,350 kcal total
BMR (Basal)
1,720 kcal Coma/survival baseline
NEAT (Walking)
353 kcal Daily non-exercise steps
TEF (Digestion)
185 kcal Thermic cost of food
EAT (Training)
92 kcal Structured workouts
Peer-Reviewed BMR Formula Audit: Baseline BMR
Mifflin (1990) 1,720
Harris-B (1984) 1,768
Katch (LBM) 1,732
Daily Maintenance Output
2,350 kcal / day

Zero weight gain or loss baseline

Basal BMR 1,720 Coma rate
Clinical BMI 25.1 Normal
Hydration 2.8 L 95 oz / day
Select Desired Target Goal
Daily Calorie Target:
1,850 kcal/day (-500 kcal)
-150 kcal (Mild) -500 kcal -1,000 kcal (Max Safe)

Hybrid Deficit Engine

Cardio vs. Diet Tradeoff

Decide how your deficit is created: eat less food, burn more movement, or balance both.

Net Deficit: -500 kcal
Diet: 50% (-250 kcal)
Cardio: 50% (-250 kcal)
100% Kitchen 50 / 50 Hybrid Balance 100% Cardio
Daily Plate Target -250 kcal food
2,100 kcal to eat

You eat +250 kcal more food per day than a sedentary diet!

Preserved Food Allowance +1 large sweet potato, or +2 whole eggs on sourdough, or +55g oats with berries & honey.
Cardio & Step Target -250 kcal cardio
+4,800 extra daily steps

Target total: 10,800 steps/day (~2.4 miles)

Prescribed Cardio Modality ~28 min outdoor brisk walk (3.2 mph) or 18 min 8% incline treadmill walk at 3.0 mph.
The G-Flux (High Energy Flux) Advantage:

Clinical research shows combining moderate food restriction with daily steps produces the same fat loss rate with 42% less hunger, lower cortisol, and zero metabolic slowdown compared to starvation-only diets.

Goal Weight Timeline Simulator

Projected: Jan 27, 2027
Target Goal Arrival -1.5 lbs / week pace
Jan 27, 2027

At 1,518 kcal/day, you will hit your goal of 152.0 lbs in 15 weeks!

Prescribed Intake 1,518 kcal / day
lbs
Fat to Lose
22.5 lbs
12.8% of body weight
Estimated Duration
15.0 Weeks
~105 calendar days
Week 6.4 Mar 12, 2027
164.8 lbs -10.2 lbs
45% to goal -35,700 kcal
175 lbs 163 lbs 152 lbs Today Goal Target Wk 0 Wk 4 Wk 8 Wk 12 Goal (Wk 15)
Interactive Milestones:

*Assumes consistent weekly adherence at current prescribed deficit (1 lb fat ≈ 3,500 kcal / 7,700 kcal per kg). Weight fluctuates daily by 1–3% due to glycogen, hydration, and digestion.

ISSN Macronutrient Distribution

Protein anchored to bodyweight (1.0g/lb) to prevent muscle loss while cutting

1,850 kcal/day
Protein
175g
700 kcal (38%)
1.0g / lb bodywt
Fats
51g
462 kcal (25%)
Hormone health
Carbs
172g
688 kcal (37%)
Training energy
Meal Split:
(~44g P / 13g F / 43g C per meal)
Targets copied to clipboard!
Scientific Decomposition

The Four Metabolic Pillars of TDEE

Daily burn is not just workouts. Understanding where your body oxidizes energy is the key to escaping the 'wearable tracker fallacy' and establishing a predictable, sustainable calorie deficit.

65–70% of TDEE

Basal Metabolic Rate (BMR)

The involuntary vegetative energy required to sustain cellular survival at complete rest: brain activity, liver processing, kidney filtration, and heart contraction.

Formula basis Mifflin / Katch
15–20% of TDEE

Non-Exercise Activity (NEAT)

All movement outside deliberate workouts: pacing, posture, daily steps, typing, and fidgeting. NEAT is the primary metabolic differentiator between fast and slow metabolisms.

Highest variance Step Count Index
8–10% of TDEE

Thermic Effect of Food (TEF)

The metabolic cost of digesting, absorbing, and processing food. Dietary protein demands 20–30% of its caloric value just to metabolize, compared to 0–3% for fats.

Protein burn 20–30% TEF
5–10% of TDEE

Exercise Thermogenesis (EAT)

Deliberate athletic conditioning and resistance training. While critical for muscular retention and cardiovascular health, exercise accounts for a modest slice of total daily oxidation.

Gym sessions Lifting & Cardio
ENDOCRINE REHABILITATION • METABOLIC RESET

The Physiology of Metabolic Recovery Post-Deficit

When you sustain a caloric deficit for months, human biology adapts through an evolutionary survival mechanism known as adaptive thermogenesis:

The Depleted State

  • Leptin is Suppressed: Constant biological hunger and cravings.
  • Thyroid T3 Drops: Cellular mitochondrial respiration down-regulates.
  • NEAT Collapses: Unconscious lethargy, minimal fidgeting or extra walking.
  • Cortisol Rises: Systemic fluid retention masking true fat loss.

The Reverse Diet Solution

  • Incremental Carbohydrate Boost: Restores thyroid T3 conversion in the liver.
  • Sustained High Protein: Keeps muscle protein synthesis peaked.
  • Cardio Volume Taper: Reduces systemic central nervous fatigue.
  • Spontaneous NEAT Rebound: Higher daily energy turnover without fat gain.

A Step-by-Step 6-Week Reverse Diet Framework

Week 1–2: Add 100 kcal per day (primarily 20g–25g carbs). Keep protein and cardio steady. Expect scale weight to fluctuate +1 to +3 lbs from water and glycogen.

Week 3–4: Add another 80–100 kcal per day (15g carbs, 3g fat). Reduce cardio duration by 15%. Note improvements in gym strength and sleep quality.

Week 5–6: Add another 80–100 kcal per day. By this point, your new maintenance intake may be 300 to 500 kcal higher than your deficit end-point with zero net fat gain.

Evidence-Based Nutrition Answers

Frequently Asked Questions About TDEE & Energy Balance

Answers to common questions regarding metabolic calculations, safe deficits, muscle retention, and formula accuracy.

What is reverse dieting?
Reverse dieting is the structured process of gradually increasing your daily caloric intake (typically by 50 to 150 kcal per day each week or two) after a prolonged weight loss phase. The goal is to incrementally bring calories back to true maintenance while stimulating metabolic recovery, restoring non-exercise activity (NEAT), and minimizing unwanted fat accumulation.
Who needs to do a reverse diet?
Reverse dieting is recommended for individuals who have been in a sustained caloric deficit for 8+ weeks, fitness competitors emerging from a contest prep cut, chronic crash dieters whose weight loss has plateaued on very low calories, or anyone seeking to exit a cut safely without rapid post-diet rebound weight gain.
How fast should I increase my calories?
Most evidence-based coaches recommend two protocols: a conservative reverse (+50 to +80 kcal per week primarily from carbohydrates and fats) for highly sensitive individuals, or a moderate reverse (+100 to +150 kcal per week) which gets you to a comfortable lifestyle intake more rapidly with negligible fat gain.
Will I gain weight during a reverse diet?
You will likely see an immediate 2 to 4-pound increase on the bathroom scale within the first 1–2 weeks, but this is almost entirely intramuscular glycogen replenishment and associated water retention (each gram of glycogen bonds with ~3g of water), NOT new adipose tissue.
What happens to cardio during a reverse diet?
Cardio volume should be tapered down inversely as caloric intake rises. For example, reducing weekly cardio sessions by 10%–20% every two weeks prevents over-training while allowing your spontaneous daily NEAT to naturally ramp back up.