Calorie Deficit Calculator

How to Use Calorie Deficit Calculator

1. Enter your TDEE. If you don't know it, use Toolzo's TDEE Calculator first. Then type your daily calorie burn here.
2. Select your gender. This sets the minimum safe intake warning – 1200 kcal for women, 1500 kcal for men.
3. Choose a weight loss rate. Pick from 0.25 kg to 1 kg per week. Each kg of fat equals about 7700 kcal, so the tool divides that into a daily deficit.
4. Click Calculate. You’ll see your daily deficit and target calorie intake, plus a safety check warning if the target drops below recommended levels.

Benefits of Calorie Deficit Calculator

• Translates a weekly weight loss goal directly into a simple daily calorie target, removing guesswork.
• Built‑in safety warnings help you avoid dangerously low intakes that can cause nutrient deficiencies or muscle loss.
• Works for any TDEE, not just one calculated by our tool; you can bring your own number from a fitness tracker.
• Instant results with no tracking – your input is never stored or shared.

Frequently Asked Questions

Is a 1000‑calorie deficit safe?

A 1000 kcal/day deficit leads to about 1 kg loss per week, which is considered the upper limit of safe weight loss for most people. However, it requires careful nutrition planning. Prolonged very low intake should be medically supervised.

Why does the calculator need my gender?

Only to set the minimum safe calorie floor, which differs between men and women. It does not affect the deficit calculation itself.

Can I use this calculator if I am breastfeeding or pregnant?

No, weight loss during pregnancy is generally not recommended, and breastfeeding increases calorie needs. Please consult your doctor before starting any calorie deficit.

Is Calorie Deficit Calculator free and private?

Yes — it is 100% free, needs no sign‑up, and everything runs in your browser; your data never leaves your device.