Calories Needed to Lose X kg by Date

What this tool does

This calculator converts a weight-loss goal (kg to lose + weeks) into an estimated daily calorie target by using the rough energy value of body fat change (often approximated as ~7,700 kcal per kg).

It’s designed for planning. Real progress depends on adherence, water shifts, and how accurate your maintenance estimate is.

Who/when to use it

• You want a simple target number to start a cut without overthinking.
• You’re deciding between a faster vs slower timeline and want to see the calorie impact.
• You already know (or estimated) your maintenance calories.

Step-by-step usage

1. Enter your current and target weight.
2. Choose how many weeks you want to give yourself.
3. Enter your maintenance kcal/day (from tracking, or a reliable estimate).
4. Use the daily target as a starting point for 10–14 days, then adjust based on trend weight and hunger/performance.

Example interpretation

Example: 82 kg → 78 kg in 10 weeks (4 kg total)

The tool calculates the average daily deficit required. If the output daily calories feel too low (or training quality tanks), the simplest fix is to extend the timeline.

Confidence framing: confidence is higher when your maintenance estimate comes from 2+ weeks of consistent logging, and lower when it is a rough guess.

Practical check: a moderate deficit should still allow decent sleep, reasonable hunger, and stable training performance most days.

FAQ

How accurate is “7,700 kcal per kg”?

It’s a planning approximation. Real results vary (water, glycogen, lean mass changes, and adaptive metabolism).

What’s a safe rate of loss?

Many people do well around ~0.5–1.0% body weight per week, but training load, starting body fat, and stress matter.

My maintenance calories are a guess — what should I do?

Start with a reasonable estimate, track for 10–14 days, and adjust based on the trend. The maintenance input is the biggest driver of the output.

Why is the tool enforcing a minimum calorie target?

Very low targets increase risk of poor recovery, binge/rebound eating, and training performance drops.

Can I use this for recomposition?

Yes, but use a smaller deficit and prioritize protein + strength training. The Deficit Safety Checker can help.

Next best tools

• Maintenance Calories by Activity — tighten maintenance assumptions before adjusting targets.
• Calorie Deficit Safety Checker — make sure your required deficit remains sustainable.
• Weight Loss Plateau Analyzer — troubleshoot if progress stalls after plan execution.