Loading...
Loading...
Loading...
Estimate daily calorie needs using the Mifflin-St Jeor equation.
Calorie Calculator is a free browser-based tool that helps you estimate daily calorie needs using the mifflin-st jeor equation. It is part of ToolsMonk's medical tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as finding how many calories to eat to lose, maintain, or gain weight, setting a daily calorie budget for a diet, and understanding your energy needs for your activity level. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Calorie Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
Enter your age, sex, height, weight, and activity level
Choose your goal — lose, maintain, or gain
See your recommended daily calorie target
Plan your eating around the number
Estimates your daily calorie needs for your goal
Accounts for age, sex, body stats, and activity level
Targets for weight loss, maintenance, or gain
A clear daily number to plan around
Runs in your browser — your details stay on your device
Free, with no signup
Finding how many calories to eat to lose, maintain, or gain weight
Setting a daily calorie budget for a diet
Understanding your energy needs for your activity level
Planning meals around a calorie target
Calorie Calculator is a powerful free online tool available on ToolsMonk that helps you estimate daily calorie needs using the mifflin-st jeor equation. Whether you're a professional, student, or casual user, our calorie calculator provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our Medical Tools collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Calorie Calculator estimates how many calories you should eat each day for your goal — loss, maintenance, or gain — based on your age, sex, body stats, and activity level.
Under the hood it builds the number in stages: your resting metabolism (BMR), multiplied by an activity factor for your maintenance calories (TDEE), then adjusted by a deficit or surplus for your goal. That's why both your body stats and an honest activity level shape the result.
For weight loss, a moderate deficit of around 500 calories a day targets a sustainable half-kilo (pound) per week while protecting muscle and energy. Extreme cuts lose faster at first but are hard to maintain and often rebound — and eating well below your BMR for long isn't advisable.
Because it's an estimate, treat the target as a starting point: the common reasons it 'doesn't work' are overestimated activity and underestimated intake, so track honestly for a few weeks and adjust. It's informational, not medical advice, and your details never leave your browser. Pair it with the TDEE, BMR, and Macro calculators for the full picture.
Aim for a moderate ~500 cal/day deficit for sustainable loss, not an extreme cut
Be honest about activity and track intake — the two biggest reasons targets miss
Recalculate as your weight changes, and adjust based on 2–3 weeks of real results
Common questions about this tool, its workflow, and what to expect before you use it.
Get notified about new tools, features, and tips. No spam, unsubscribe anytime.
Calculate your Body Mass Index with health category & advice.
Try itEstimate due date, current week & pregnancy milestones.
Try itAssess cardiovascular & lifestyle health risk factors.
Try itEstimate body fat using the U.S. Navy formula.
Try itCalculate 5 training heart rate zones (Karvonen method).
Try itCalculate daily protein, carbs & fat with preset diet plans.
Try itCalculate your Basal Metabolic Rate with activity breakdown.
Try itFind optimal bedtime/wake time based on 90-min sleep cycles.
Try it