2026-09-15 8 min

TDEE Deficit Calculator

Size your cut from maintenance: deficit picker, target intake, weekly loss rate, weeks-to-goal timeline, and floor guardrails that keep cuts safe.

Calculator

Gender

Units

Age

yrs

Full years

Height

Barefoot standing height

Weight

lbs

Morning scale weight

Activity

Deficit

Goal loss

lbs

Total pounds to lose for the timeline

Results update live as you type

Status:TDEE 2,557 kcalTarget 2,057 kcal1.00 lbs/wk

Deficit Plan Results

Daily target2,057 kcal/day

Weekly loss~1.00 lbs/week

Timeline (20 lbs)20 weeks → Mar 15, 2027

Protein floor154 g/day

Safety floors1,815 / 1,500 kcal

Deficit Options (this TDEE)

Deficit	Target	Rate	20 lbs in
-250 kcal	2,307 kcal	0.50 lbs/wk	40 wks
-500 kcal	2,057 kcal	1.00 lbs/wk	20 wks
-750 kcal	1,815 kcal	1.48 lbs/wk	13.5 wks
-1000 kcal	1,815 kcal	1.48 lbs/wk	13.5 wks

Recommendations

▸Eat 2,057 kcal (500 deficit) to lose ~1.00 lbs/week — 20 lbs lands around Mar 15, 2027
▸Hold 154 g protein and lift 2-4x weekly so losses come from fat, plus 8-12k daily steps
▸Expect 2-4 week plateaus as TDEE falls with weight — recalculate targets per 10 lbs, never slash blindly

Results

Normal

Target

2,057 kcal

Daily intake for the chosen pace

Rate

~1.00 lbs/wk

Expected scale velocity, trend-verified

Timeline

20 wks → Mar 15, 2027

20 lb goal at this pace

Protein

154 g/day

2.2 g/kg muscle insurance

Floor

1,815 kcal

BMR x 1.1 and gender minimum enforced

3,500 kcal per pound with BMR x 1.1 plus gender-minimum floors (1,500/1,200). Timelines assume steady adherence — plateaus and refeeds adjust reality, not arithmetic.

Visualizations

TDEE vs Target vs Floor (kcal)

2,557TDEE

2,057Target

1,815Floor

Target vs Safe Range

2,057kcal

8003,000

Deficit Depth

Cut500kcal

Formula

Deficit planning subtracts a chosen daily gap from activity-scaled Mifflin maintenance, then enforces two safety floors — 110% of BMR and gender minimums — capping the target instead of serving dangerous numbers. The effective (possibly capped) deficit converts at 3,500 kcal per pound into weekly velocity and goal timelines.

Target = TDEE - deficit, floored at max(BMRx1.1, 1500M/1200F)

Alternative Form

Weekly loss = deficit x 7/3500; weeks = goal / rate

Variables

Symbol	Name	Unit	Description
Target	Daily intake	kcal	TDEE minus deficit, floored
Rate	Loss velocity	lbs/week	Effective deficit x 7/3500
Floor	Safety minimum	kcal	max(BMRx1.1, gender minimum)
Timeline	Goal date	weeks	Goal pounds over weekly rate

Explanation

Floors exist because deficits below resting-plus-a-tithe cost muscle, hormones, and adherence faster than they cost fat. Capping converts dangerous ambition into longer scheduling — the only honest trade available.

Derivation

Target = max(TDEE-d, max(1.1xBMR, 1500/1200)). Rate = (TDEE-target) x 7/3500. Weeks = goal/rate. Protein = 2.2 x kg guards lean mass inside the gap.

Step-by-Step Calculation

Follow each step to understand how the result is calculated from your inputs.

Step 1

Establish maintenance with Mifflin x activity.

TDEE = BMR x factor

TDEE:2,557 kcal

Intermediate: The ceiling every deficit subtracts from

Result: Maintenance = 2,557 kcal

Step 2

Subtract the chosen deficit.

Target = TDEE - deficit

Deficit:-500 kcal

Intermediate: 2,557 - 500 = 2,057

Result: Raw target = 2,057 kcal

Step 3

Enforce both safety floors.

Floor = max(BMR x 1.1, 1500M/1200F)

Floor:1,815 kcal

Intermediate: Target clears both floors

Result: Target stands as requested

Step 4

Convert the effective deficit to weekly loss.

lbs/wk = deficit x 7 / 3500

Rate:~1.00 lbs/week

Intermediate: 500 x 7 / 3500

Result: Expect ~1.00 lbs weekly

Step 5

Divide the goal by the rate for the timeline.

Weeks = goal lbs / weekly rate

Goal:20 lbs

Intermediate: 20 / 1.00 = 20 weeks

Result: Goal lands around Mar 15, 2027

Step 6

Armor the cut with protein and steps.

2.2 g/kg protein + lifting + 8-12k steps

Protein:154 g/day

Intermediate: Expect 2-4 week plateaus as TDEE falls with weight — recalculate targets per 10 lbs, never slash blindly

Result: Eat 2,057 kcal (500 deficit) to lose ~1.00 lbs/week — 20 lbs lands around Mar 15, 2027

Final Answer

2,057 kcal

Worked Examples

See how the calculator works with different scenarios.

Scenario

A 30-year-old man, 175 cm, 70 kg, moderate, -500, goal 20 lbs.

Inputs

Stats:175 cm / 70 kg

Deficit:-500

Goal:20 lbs

Calculation

TDEE = 2556. Target = 2056 (floor 1814 — clears). Rate = 500x7/3500 = 1.00/wk. Weeks = 20. Date ~5 months out.

Result

Target 2,056; 1.00/wk; 20 weeks

Interpretation

The textbook cut: honest pace, cleared floors, dated finish — print it and lift.

Understanding Your Result

Your Result: Target: 2,057 kcal

Typical range: Sustainable velocities run 0.5-1% of body weight weekly; floors sit near BMR x 1.1; timelines stretch 12-30 weeks for typical goals.

What This Means

A complete cut brief: floored daily target, realistic weekly velocity, dated goal timeline, protein insurance, and the four-option comparison table.

Why It Matters

Failed cuts usually fail on arithmetic first (unsafe targets) and patience second (dateless goals). Flooring plus dating fixes both before willpower is ever tested.

Professional Interpretation

Prescribe the mildest deficit hitting the deadline, never the deepest tolerable week. Capped plans are features to celebrate with clients, not apologies.

Two floors, one cap

Effective vs requested

Recommendations

•Default to -500; earn -750 with two good weeks
•Never override a floor cap — extend time instead
•Protein 2.2 g/kg and lifting are non-negotiable
•Recalculate per 10 lbs; plateaus are usually stale math
•Date every goal; dateless cuts drift

Educational Content

Introduction

The TDEE Deficit Calculator turns maintenance into a dated fat-loss plan. Stats, deficit, and goal in — floored target, velocity, timeline, and protein out.

Concept Explanation

Deficits are simple subtraction guarded by physiology: floors protect tissue and function while timelines protect patience. The page enforces both guards automatically.

Applications

▸Planning sustainable cuts

▸Dating goal weights honestly

▸Right-sizing deficit ambition

▸Explaining floor-capped plans

▸Plateau forensics per 10 lbs

▸Client cut briefings

Benefits

•Four deficit options compared
•Dual floors enforced automatically
•Dated timelines included
•Protein insurance computed
•Effective-deficit honesty

Limitations

•3500/lb rule averages real variance
•Water and glycogen swing early weeks
•Adaptation beyond tissue unmodeled
•Adherence assumed steady

Best Practices

•Start -500, adjust by trend
•Weigh daily, judge 2-4 week slopes
•Keep lifting and steps through cuts
•Re-run per 10 lbs without exception
•Celebrate floor caps as smart, not slow

Common Misconceptions

Myth: Bigger deficits always finish sooner.

Truth: Past ~750-1000, muscle loss and rebound erase the head start. Floored moderate cuts win most 6-month comparisons ever run.

Myth: The scale should drop weekly.

Truth: Water, glycogen, and cycles mask fat loss for weeks. Judge 4-week slopes at constant sodium and training.

Myth: Floors are for beginners.

Truth: Floors protect advanced dieters most — they are the ones tempted to stack deficits onto already-low intakes.

Practical Tips

•Pick the deficit you can hold 12 weeks, not 12 days
•Front-load protein to blunt evening hunger
•Schedule diet breaks before you need them
•Weigh and measure in the morning before food for repeatable inputs
•Re-run the numbers after every 10-15 lbs of weight change
•Validate any estimate against 2-4 weeks of weight-trend data

Common Mistakes

Stacking deficits from multiple pages

TDEE-minus-500 already is the deficit. Subtracting activity calories or meal-skipping on top double-counts the gap into muscle-loss territory.

Chasing the timeline by deepening cuts

Halving the weeks by doubling the deficit halves adherence twice as fast. Move the date, not the floor.

Abandoning lifting to save energy

The saved 200 kcal costs far more in muscle-driven burn within weeks. Lifting is deficit insurance, not optional spending.

Using goal weight instead of current weight

Equations describe the body you have, not the one you want. Current weight sets today's burn; goal weight enters only when planning the next phase.

Confusing BMR with maintenance

BMR is the resting floor. Eating at BMR while active is an automatic deficit — multiply by activity (TDEE) before setting intake.

Assumptions

This calculator makes the following assumptions to provide estimates:

3500 kcal/lb: Classic energy-density approximation.

Dual floors: max(BMRx1.1, gender minimum) enforced.

Steady adherence: Timelines assume the deficit holds.

Metric internals: Imperial converts before math.

Whole-kcal targets: Targets round to whole calories.

Limitations

Be aware of these limitations when using this calculator:

Rule-of-thumb rate: Real loss varies with composition and water.

No adaptation: Beyond-tissue slowdown excluded.

Static TDEE: Falling burn needs per-10-lb refreshes.

Date projection: Linear math; real life plateaus.

Frequently Asked Questions

Answers to common questions about this calculator.

What calorie deficit should I choose?

Start at -500 (about 1 lb/week) if floors clear; -250 if training quality matters most. Only -750+ with experience, high body fat, and supervision — floors still rule.

Why was my target capped?

Your requested deficit dove below max(BMR x 1.1, 1,500/1,200). The cap protects muscle and function — the effective smaller deficit with a longer timeline is the plan.

How fast will I lose weight?

Roughly deficit x 7/3,500 lbs weekly at first, slowing as TDEE falls with weight. Recalculate per 10 lbs to keep the velocity honest.

When should I end the cut?

At goal weight, stalled adherence, or 12-16 weeks — whichever comes first. Diet breaks at maintenance every 2-3 months preserve muscle and sanity.

What is TDEE?

Total Daily Energy Expenditure — every calorie burned in 24 hours: basal metabolism (60-75%), food digestion TEF (~10%), daily movement NEAT (15-30%), and deliberate exercise (5-10%). Eating at TDEE holds weight steady.

How is TDEE calculated?

Estimate BMR (usually Mifflin-St Jeor), then multiply by an activity factor: 1.2 sedentary, 1.375 light, 1.55 moderate, 1.725 heavy, 1.9 athlete. The product is maintenance.

What is NEAT and why does it matter?

Non-Exercise Activity Thermogenesis — walking, standing, chores, fidgeting. It varies 200-800+ kcal/day between people and is the most adjustable TDEE lever after formal exercise.

How accurate are TDEE estimates?

Within about 10-15% for most people when activity is honestly rated. Validate by eating at the estimate 2-4 weeks: stable weight confirms it, drift corrects it.

How do I use TDEE to lose weight?

Eat 250-500 kcal below TDEE for 0.5-1 lb weekly loss, keep protein high and lift to protect muscle, and never hold intake below your BMR floor for long.

How do I use TDEE to gain muscle?

Eat 250-350 kcal above TDEE with progressive resistance training and 1.6-2.2 g/kg protein. Bigger surpluses mostly accelerate fat gain, not muscle.

How often should I recalculate TDEE?

Every 4-8 weeks while changing, or per 10-15 lbs. Smaller bodies burn less, so yesterday maintenance becomes today surplus silently.

Related Calculators

Explore more calculators related to this topic.

Related Guides

Deepen your understanding with these educational resources.

Metabolism Basics

BMR, TDEE, and where your calories actually go.

Setting Calories for Fat Loss

From TDEE to deficit without muscle loss.

Protein and Strength While Dieting

Keep the engine while shrinking the chassis.

Glossary

Technical terms used in mortgage calculations explained in plain language.

Deficit: Daily kcal below maintenance.
Safety floor: max(BMRx1.1, 1,500/1,200) intake minimum.
Effective deficit: TDEE minus the (possibly capped) target.
Goal date: Projected arrival at steady velocity.
BMR: Basal Metabolic Rate: resting calorie burn for vital functions.
TDEE: Total Daily Energy Expenditure: BMR plus all activity and digestion.
Lean body mass: Weight minus fat mass; the engine room equations like Katch use.
Metabolic adaptation: Down-regulation of expenditure during prolonged dieting beyond what tissue loss predicts.

Authoritative References

Trusted sources and standards referenced by this calculator.

Academy of Nutrition and Dietetics — Energy expenditure guidance ACSM — Metabolism and body composition resources PubMed — Predictive equation literature (Mifflin, Harris-Benedict, Cunningham, Owen) FAO/WHO/UNU — Schofield human energy requirements (1985) CDC — Finding a healthy weight and activity guidance MedlinePlus — Metabolism and weight management

Applicable Standards

Mifflin-St Jeor (AJCN 1990)Harris-Benedict original (1919) and Roza-Shizgal revision (1984)FAO/WHO/UNU Schofield requirements (1985)

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Page Information

Last Updated:

2026-09-15

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.