Why 3,500 calories per pound?

One pound of body fat stores roughly 3,500 kcal of energy (about 7,700 kcal per kg). Creating a cumulative deficit of that size causes the body to burn approximately one pound of fat. It is a well-established estimate, though individual variation exists.

What is a safe daily calorie deficit?

Most guidelines consider 500–1,000 kcal/day safe for most adults, corresponding to roughly 1–2 lb (0.45–0.9 kg) of loss per week. Deficits beyond 1,000 kcal/day risk muscle loss, nutrient deficiencies, and metabolic adaptation. The calculator warns when the required deficit exceeds these thresholds.

What is TDEE and how do I find mine?

TDEE (Total Daily Energy Expenditure) is the total calories your body burns in a day, including activity. You can estimate it with our TDEE calculator using your weight, height, age, sex, and activity level. A typical sedentary adult TDEE is 1,800–2,500 kcal.

What if the calculator says the goal is too aggressive?

If the required deficit exceeds 1,000 kcal/day or puts intake below 1,200 kcal (women) or 1,500 kcal (men), consider extending the deadline, reducing the target weight loss, or consulting a dietitian.

Does this account for metabolic adaptation?

No — the 3,500 cal/lb model is a linear estimate. In practice, TDEE decreases as you lose weight and the body adapts. Re-run the calculation every 2–4 weeks with your updated weight and TDEE.

Calorie Deficit Calculator for Weight Goal

Name: Calorie Deficit Calculator for Weight Goal
Availability: InStock
Author: Nham Vu

Enter your current weight, goal weight, target date, and TDEE to find the exact daily calorie deficit needed.

Your Details

Unit System

Current Weight (lb)

Goal Weight (lb)

Target Date

Your TDEE (kcal/day)

Not sure? Use our TDEE calculator.

Sex (for minimum intake check)

Fill in the form and click Calculate to see your daily deficit plan.

Daily Deficit

kcal/day below TDEE

Daily Intake Target

kcal/day to eat

Weight to Lose

Time to Goal

days remaining

Weekly Breakdown

Metric	Value

Alternative Pacing

If your required deficit is too aggressive, here are common deficit levels and how long each would take:

Summary

Enter your current weight, goal weight, target date, and TDEE to find the exact daily calorie deficit needed.

How it works

Enter your current weight and select pounds or kilograms.
Enter your goal weight (must be less than current weight for a deficit).
Pick your target date using the date picker.
Enter your Total Daily Energy Expenditure (TDEE) — use our TDEE calculator if unsure.
Click Calculate to see the required daily deficit, your target intake, and a weekly breakdown.

Use cases

Plan a realistic calorie deficit before starting a cut.
Check whether a weight loss goal is achievable by a given event date.
Find the minimum daily intake needed while staying above safe thresholds.
Understand how many weeks a weight loss goal will realistically take.
Compare aggressive vs. moderate deficit strategies side by side.
Set a data-driven calorie target for a fitness or diet app.

Frequently Asked Questions

Last updated: 2026-07-22 · Reviewed by Nham Vu