Health & Fitness
Calorie Calculator
Calorie Calculator is a browser-based calculator tool on CalcToolsBase. Estimate a daily calorie target for losing, maintaining, or gaining weight. To use it, enter your values and view the result directly in your browser — no signup and nothing to install.
Calorie Calculator lets you work out your daily calorie target in seconds: enter your weight, height, age and sex for a daily calorie target, with maintenance and BMR, all worked out locally in your browser.
About this calculator
The Calorie Calculator gives you a quick way to work out your daily calorie target. Enter your weight, height, age and sex; it then returns a daily calorie target, with maintenance and BMR, worked out with your TDEE adjusted for your goal the moment you calculate. It runs fully in the browser, so it is private by design and works offline once loaded.
Calorie needs are individual and change with body composition and activity. Treat the target as a starting estimate and adjust based on real-world results over time.
How to use
- Enter your weight, height, and age first.
- Pick your sex and activity level.
- Choose whether you want to lose, maintain, or gain.
- Press Calculate to see your daily calorie target.
Why use Calorie Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Educational
Uses common estimation formulas for educational purposes. Results are not medical advice and should not replace professional guidance.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Clear about formulas used and their limits, with disclaimers where they matter.
Common uses
Calorie as a general wellness guide
Calorie when adjusting diet and exercise
Calorie alongside a workout plan
Calorie in personal-training sessions
Calorie for everyday fitness check-ins
Calorie for staying accountable
Technical notes
Calorie Calculator estimates daily calories from the Mifflin-St Jeor BMR, then multiplies by your activity factor.
These are general-population estimates and not a substitute for advice from a qualified clinician.
Because it runs locally, results appear instantly with no server round-trip.
Worked example
Maintenance calories = BMR × an activity factor. With a BMR of 1,500 kcal and a 'lightly active' factor of 1.375, daily maintenance is ≈ 2,063 kcal. A moderate 500 kcal deficit (~1,563 kcal) is often used as a starting point for gradual change. Individual needs vary widely — treat this as a rough guide and consult a qualified professional for a personalised plan.
FAQ
How is my calorie target calculated?
We estimate TDEE from the Mifflin–St Jeor equation and your activity level, then subtract about 500 kcal for weight loss or add about 500 kcal for weight gain.
Is a 500 kcal deficit safe?
A daily deficit of roughly 500 kcal is a common, moderate pace of about 0.45 kg per week for many adults, but individual needs vary — check with a professional.
Should I eat the same amount every day?
Daily intake can vary; what matters more is the weekly average. Adjust if your weight is not moving the way you expect after a few weeks.
Does the Calorie Calculator send my data to a server?
No. The Calorie Calculator runs entirely in your browser — your inputs never leave your device, and nothing is uploaded or stored.