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TDEE for Weight Gain

300–500 kcal surplus. Free online TDEE for Weight Gain. Calculate tdee for weight gain online — fast, accurate, mobile-friendly, no signup needed.

TDEE = BMR × activity multiplier.
Target kcal
2,875

Derivation

  1. ├── 01Giventdee = 2500, pct = 15
  2. ├── 02Formulae.tdee × (1+e.pct / 100)
  3. ├── 03Substitutee.2500 × (1+e.15 / 100)
  4. └── 04Compute Target kcal2,875
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§01What is

Understanding the TDEE for Weight Gain

The TDEE for Weight Gain computes Target kcal from 2 inputs: tdee (kcal), surplus (%). 300–500 kcal surplus.

Health metrics give us objective checkpoints against a body that can feel unreliable. Used alongside professional guidance — not in place of it — these numbers help you track progress and spot trends that matter. The TDEE for Weight Gain sits in that toolkit — it 300–500 kcal surplus. Enter your numbers above and the result updates instantly; every step of the math is shown in the Derivation panel so you can see exactly how the answer was reached.

§02The Formula

How it’s calculated

e.tdee × (1+e.pct / 100)

Where

tdee
TDEE (kcal)
pct
Surplus (%)
§03Practical Example

Step-by-step walkthrough

Scenario

Apply the formula to a realistic set of inputs: TDEE (kcal) = 2500, Surplus (%) = 15.

  1. 01Start by noting the input — TDEE (kcal): 2500.
  2. 02Start by noting the input — Surplus (%): 15.
  3. 03Substitute these values into the formula: e.tdee × (1+e.pct / 100)
  4. 04Compute Target kcal: the calculator returns 2875.
  5. 05Cross-check the answer by opening the Derivation panel above — every line of math is shown so you can follow the computation end-to-end.
§04Variants

Common TDEE for Weight Gain Problems

The formula gets rearranged depending on which variable you need. Here are the patterns you’ll run into in the real world — find the one that matches your problem and follow the worked steps.

01 · PATTERN

TDEE (kcal) halved

tdee = 1250 (from 2500)

Keep every other input at its default and halve the tdee (kcal). See how target kcal responds.

  1. 01New TDEE (kcal): 1250
  2. 02Baseline Target kcal: 2875
  3. 03New Target kcal: 1437.5
  4. 04Target kcal decreases by 50% → use this sensitivity to plan for real-world variation.
02 · PATTERN

TDEE (kcal) doubled

tdee = 5000 (from 2500)

Keep every other input at its default and double the tdee (kcal). See how target kcal responds.

  1. 01New TDEE (kcal): 5000
  2. 02Baseline Target kcal: 2875
  3. 03New Target kcal: 5750
  4. 04Target kcal increases by 100% → use this sensitivity to plan for real-world variation.
03 · PATTERN

Surplus (%) halved

pct = 7.5 (from 15)

Keep every other input at its default and halve the surplus (%). See how target kcal responds.

  1. 01New Surplus (%): 7.5
  2. 02Baseline Target kcal: 2875
  3. 03New Target kcal: 2687.5
  4. 04Target kcal decreases by 6.5% → use this sensitivity to plan for real-world variation.
04 · PATTERN

Surplus (%) doubled

pct = 30 (from 15)

Keep every other input at its default and double the surplus (%). See how target kcal responds.

  1. 01New Surplus (%): 30
  2. 02Baseline Target kcal: 2875
  3. 03New Target kcal: 3250
  4. 04Target kcal increases by 13% → use this sensitivity to plan for real-world variation.
§05FAQ

Frequently asked questions

Yes. The calculator implements the standard formula as documented and returns exact floating-point results. No approximations are used unless noted in the formula.
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