Kcal Rechner (BMR + Tagesbedarf)
Estimate based on the Mifflin-St Jeor formula. Individual metabolism varies.
What is a kcal rechner?
A kcal rechner is a calorie calculator that estimates how much energy your body needs each day. It helps answer practical questions like:
- How many calories should I eat to lose weight?
- What is my daily maintenance level?
- How much should I increase calories to gain muscle without excessive fat gain?
Most people struggle with nutrition because they guess. A calculator gives you a data-driven starting point, then you adjust based on real progress over 2-4 weeks.
How this calorie calculator works
1) Basal Metabolic Rate (BMR)
BMR is the energy your body uses at rest for essential functions (breathing, circulation, temperature regulation, organ function). We use the widely accepted Mifflin-St Jeor equation:
- Male: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
- Female: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
2) Total Daily Energy Expenditure (TDEE)
To estimate your actual daily need, BMR is multiplied by an activity factor. This gives TDEE, your maintenance calories.
If you eat around TDEE, your weight tends to stay stable. Below TDEE, you lose weight; above TDEE, you gain weight.
3) Goal adjustment
Depending on your goal, your calories are adjusted by a percentage:
- Fat loss: usually 10-20% below maintenance
- Maintenance: around 0% adjustment
- Muscle gain: usually 5-15% above maintenance
The calculator also provides a simple macro split (protein, fat, carbs) as a practical starting framework.
How to use your result effectively
Track average body weight, not daily fluctuations
Body weight naturally changes day-to-day due to water, sodium, glycogen, and digestion. Weigh yourself several times per week and compare weekly averages.
Adjust only after 2-4 weeks
If fat loss or gain is slower/faster than desired, adjust calories by 100-200 kcal and monitor again. Small changes are easier to maintain and produce better long-term results.
Prioritize protein and consistency
Protein supports satiety and muscle retention. A realistic plan you can follow for months beats a perfect plan you quit after 10 days.
Example targets by goal
- Fat loss: Aim for ~0.3-0.8% bodyweight loss per week.
- Maintenance: Keep calories stable and use performance/energy as feedback.
- Muscle gain: Target ~0.1-0.25% bodyweight gain per week for cleaner bulking.
Frequently asked questions
Is this calculator 100% accurate?
No calculator can perfectly predict human metabolism. Treat this as a starting estimate, then personalize using your real progress.
What if I have a very active job?
Choose a higher activity level and monitor results. Manual labor can significantly increase total calorie needs.
Should I eat the same calories every day?
Not necessarily. Some people prefer fixed daily intake, others use higher calories on training days and lower intake on rest days while keeping weekly calories aligned.
Can I use this kcal rechner for recomposition?
Yes. Start near maintenance, keep protein high, train progressively, and evaluate photos, measurements, and strength over time.
Final note
A calorie target is a tool, not a rule carved in stone. The best nutrition strategy is one that fits your life, supports training performance, and can be sustained long enough to produce meaningful results.