2026-09-15 8 min

TDEE Surplus Calculator

Size lean bulks from maintenance: surplus picker, target intake, weekly gain rate, weeks-to-goal timeline, and protein that keeps gains muscular.

Calculator

Gender

Units

Age

yrs

Full years

Height

Barefoot standing height

Weight

lbs

Morning scale weight

Activity

Surplus

Goal gain

lbs

Total pounds to gain for the timeline

Results update live as you type

Status:TDEE 2,557 kcalTarget 2,857 kcal (+300)+0.60 lbs/wk

Surplus Plan Results

Daily target2,857 kcal/day

Weekly gain~+0.60 lbs/week

Timeline (10 lbs)~16.7 weeks

Protein range112-154 g/day

Maintenance base2,557 kcal

Surplus Options (this TDEE)

Surplus	Target	Rate	10 lbs in
+150 kcal	2,707 kcal	+0.30 lbs/wk	33.3 wks
+250 kcal	2,807 kcal	+0.50 lbs/wk	20 wks
+300 kcal	2,857 kcal	+0.60 lbs/wk	16.7 wks
+500 kcal	3,057 kcal	+1.00 lbs/wk	10 wks

Recommendations

▸Eat 2,857 kcal (+300) to gain ~0.60 lbs/week — 10 lbs takes ~16.7 weeks
▸Hold 112-154 g protein with progressive compounds — surplus without progression is just weight
▸Cap the bulk phase at 8-16 weeks or ~15% body fat, then consolidate before pushing further

Results

Normal

Target

2,857 kcal

Daily intake for the chosen surplus

Rate

+0.60 lbs/wk

Expected scale velocity

Timeline

~16.7 wks

10 lb goal at this pace

Protein

112-154 g/day

1.6-2.2 g/kg muscle-building range

TDEE

2,557 kcal

Maintenance underneath the surplus

3,500 kcal per pound with +150-300 lean-bulk guidance and protein at 1.6-2.2 g/kg. Faster targets exist in the table for context, not recommendation.

Visualizations

TDEE vs Target (kcal)

2,557TDEE

2,857Target

Surplus Aggression

300kcal

0750

Surplus vs 500 kcal Reference

Added300kcal

Formula

Lean-bulk planning adds a chosen daily surplus to activity-scaled Mifflin maintenance, converts it at 3,500 kcal per pound into weekly velocity and goal timelines, and pairs every target with the protein range that keeps gains muscular.

Target = TDEE + surplus (+150 to +500)

Alternative Form

Weekly gain = surplus x 7/3500; weeks = goal / rate

Variables

Symbol	Name	Unit	Description
Target	Daily intake	kcal	TDEE plus the chosen surplus
Rate	Gain velocity	lbs/week	Surplus x 7/3500
Protein	Building range	g/day	1.6-2.2 g per kg
Timeline	Goal date math	weeks	Goal pounds over weekly rate

Explanation

Muscle accrues slowly (~0.25-0.5 lb/week for most) while fat accrues at whatever surplus remains — so the smallest surplus that moves training performance up is the optimal one, and bigger numbers mostly buy faster fat.

Derivation

Target = TDEE + s. Rate = s x 7/3500. Weeks = goal/rate. Protein = 1.6-2.2 x kg. Lean zone +150-300; +500 for hard gainers or short pushes only.

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 floor every surplus builds on

Result: Maintenance = 2,557 kcal

Step 2

Add the chosen surplus.

Target = TDEE + surplus

Surplus:+300 kcal

Intermediate: 2,557 + 300 = 2,857

Result: Target = 2,857 kcal

Step 3

Grade the surplus size.

Lean: +150-300; aggressive: +500

Picked:+300

Intermediate: Muscle-favoring zone

Result: Lean-bulk territory

Step 4

Convert to weekly gain.

lbs/wk = surplus x 7 / 3500

Rate:+0.60 lbs/week

Intermediate: 300 x 7 / 3500

Result: Expect ~+0.60 lbs weekly

Step 5

Divide the goal by the rate.

Weeks = goal lbs / weekly rate

Goal:10 lbs

Intermediate: 10 / 0.60 = 16.7 weeks

Result: Goal takes ~16.7 weeks

Step 6

Attach protein and an exit plan.

1.6-2.2 g/kg + 8-16 week cap

Protein:112-154 g/day

Intermediate: Cap the bulk phase at 8-16 weeks or ~15% body fat, then consolidate before pushing further

Result: Eat 2,857 kcal (+300) to gain ~0.60 lbs/week — 10 lbs takes ~16.7 weeks

Final Answer

2,857 kcal

Worked Examples

See how the calculator works with different scenarios.

Scenario

A 30-year-old man, 175 cm, 70 kg, moderate, +300, goal 10 lbs.

Inputs

Stats:175 cm / 70 kg

Surplus:+300

Goal:10 lbs

Calculation

TDEE = 2556. Target = 2856. Rate = 300x7/3500 = 0.60/wk. Weeks = 16.7. Protein = 112-154 g.

Result

Target 2,856; +0.60/wk; ~17 weeks

Interpretation

Four months of disciplined eating and lifting for ten mostly-lean pounds — bulking honesty.

Understanding Your Result

Your Result: Target: 2,857 kcal

Typical range: Lean velocities run 0.25-0.5 lb/week; +150-300 surpluses; 8-16 week phases. Faster belongs to beginners and the frankly underweight only.

What This Means

A complete bulk brief: surplus-sized daily target, realistic weekly velocity, dated goal timeline, protein range, and the four-option comparison table.

Why It Matters

Dirty bulks waste months cutting what impatience gained. Right-sized surpluses with dates keep every pound accountable to training performance.

Professional Interpretation

Prescribe the smallest surplus moving lifts up monthly. When waist outruns strength, the surplus — not training — is wrong.

Surplus quality over quantity

Exit plans included

Recommendations

•Default lean bulks to +250-300
•Cap phases at 8-16 weeks, then hold
•Protein 1.6-2.2 g/kg with progression
•Waist-gain alarm: 1 inch per 4 lbs max
•Date every bulk; dateless bulks become lifestyles

Educational Content

Introduction

The TDEE Surplus Calculator turns maintenance into a dated muscle-gain plan. Stats, surplus, and goal in — target, velocity, timeline, and protein out.

Concept Explanation

Muscle synthesis caps daily; excess energy beyond the cap stores as fat. Small honest surpluses ride the cap without overshooting it — patience as programming.

Applications

▸Planning lean bulks

▸Sizing hard-gainer pushes

▸Dating mass goals honestly

▸Balancing fat risk vs speed

▸Off-season athlete fueling

▸Post-cut reverse phases

Benefits

•Four surplus options compared
•Velocity preview sets patience
•Protein range auto-computed
•Phase caps prevent dirty bulks
•Dated timelines included

Limitations

•3500/lb rule averages variance
•Beginner vs advanced rates differ
•Sleep and stress swing partitioning
•Adherence assumed steady

Best Practices

•Start +250, escalate by performance
•Track lifts alongside weight
•Cap waist gain per phase
•Hold new weight before cutting
•Re-run TDEE as mass climbs

Common Misconceptions

Myth: More surplus means more muscle.

Truth: Synthesis caps near +300 for most; beyond that, fat accelerates while muscle barely budges. Eat to the cap, not past it.

Myth: Bulking excuses junk food.

Truth: Food quality drives training performance, recovery, and waist control. Surplus calories still want protein, fiber, and micronutrients.

Myth: Cardio kills gains.

Truth: Conditioning supports work capacity and appetite; only marathon volumes threaten surpluses. Keep 2-3 easy sessions weekly.

Practical Tips

•Pick surplus by waist response, not scale speed
•Weigh 3x weekly; judge 4-week slopes
•Add 100 kcal when lifts stall two weeks
•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

Permabulking past 20% body fat

Insulin sensitivity and partitioning worsen with fatness — each pound past ~15-18% returns less muscle. Cut, then resume leaner.

Skipping conditioning while bulking

Work capacity caps training volume, which caps muscle. Keep easy cardio; the 200 kcal cost is rounding inside a surplus.

No exit date on the bulk

Open-ended surpluses drift into lifestyles. Date the phase, define the waist alarm, and honor both.

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.

Lean-zone guidance: +150-300 recommended; +500 contextual.

Steady training: Timelines assume progressive overload 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:

Rate variance: Partitioning differs by training age and genetics.

Rule-of-thumb: Real gain splits fat/muscle unpredictably.

Static TDEE: Rising mass needs target refreshes.

Snapshot plan: Life and appetite shift mid-bulk.

Frequently Asked Questions

Answers to common questions about this calculator.

What calorie surplus should I choose?

Most lifters: +250-300 for ~0.5-0.6 lb weekly. Hard gainers and beginners can push +500 briefly. Past that, fat outruns muscle for nearly everyone.

How fast will I gain muscle?

Scale velocity runs ~0.5 lb/week on lean bulks, but only a fraction is muscle — beginners up to half, intermediates a quarter or less. Waist tracking splits the difference.

Do I need to bulk to build muscle?

Beginners and detrained lifters recomp at maintenance; intermediates need small surpluses for best rates. The leaner you start, the more surplus helps.

When should I stop bulking?

At 8-16 weeks, ~15% body fat (men) / ~25% (women), or when waist gains outrun strength gains — then hold 4-8 weeks before any cut.

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.

Surplus: Daily kcal above maintenance.
Lean bulk: +150-300 surplus prioritizing muscle.
Partitioning: Splitting gains between muscle and fat.
Consolidation: Holding new weight before cutting.
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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Last Updated:

2026-09-15

Version:

2.0.0

References:

License:

Free to use for educational and professional purposes.