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Calorie Calculator | Find Daily Calories For Weight Goals

Determines how many calories you should eat each day to hit your goal. Enter your age, sex, height, weight, and activity level, plus your goal of losing, maintaining, or gaining weight, and the tool computes your maintenance calories and a safe daily target using standard BMR and activity equations, with a recommended weekly rate of change.

Last updated: June 2026 · Free · No sign-up required

Results

Enter values above and click Calculate to see your result instantly.

Quick reference

Daily adjustment	Approx. weekly change signal
0 kcal	Maintenance trend
−250 kcal	Slow fat-loss target
−500 kcal	Common moderate deficit
+250 kcal	Lean-gain starting surplus

monitor_weight A starting point, not a diagnosis

This calculator gives you the same number a clinician would compute by hand from your inputs. It is informational, never a substitute for a doctor. If a result surprises you, write it down and discuss it at your next appointment — that conversation is the goal, not a verdict from a webpage.

science Built from peer-reviewed formulas

Every health calculator on CalcaTools uses an equation from the WHO, NIH, ACOG, CDC, or a published peer-reviewed paper. The exact citation is in the "Formula & methodology" section. We re-check sources quarterly and update the page when guidance changes — the "Last reviewed" date is at the top.

volunteer_activism Designed for real people

Health calculations only help if you can actually use them. We use plain-English labels (no jargon), accept both metric and US units, and show what a "normal" range looks like alongside your result — so you understand what the number means, not just what it is.

lock Private by design

Your weight, height, age, pregnancy details, and any other health input never leave your browser. Calculations run client-side; nothing is logged or stored on our side. We don't want your medical data — we just want the formula to work for you.

Interpretation guide

Best practice	Why
Track averages	Daily scale weight is noisy
Prioritize protein/resistance training	Helps preserve lean mass in a deficit
Avoid extreme deficits	Improves adherence and reduces risk

lightbulb A real-world example — daily calorie target for weight loss

A 28-year-old woman, 5'5" (165 cm), 145 lb (65.8 kg), moderate exercise 3-5×/week. Goal: lose 1 lb per week.

Result: BMR: 1,418 cal/day. TDEE (moderate activity): 2,200 cal/day. Recommended daily intake for 1 lb/week loss: 1,700 calories.

What this means: A 500 cal/day deficit yields ~1 lb (0.45 kg) weight loss per week — the safe maximum recommended by the NIH for sustainable loss without compromising lean mass. Going below 1,200 cal/day (women) or 1,500 cal/day (men) is not recommended without medical supervision. Track for 2 weeks and adjust; weight fluctuates with water and glycogen, so look at the 14-day average, not a daily reading.

Formula & methodology

Formula: Mifflin-St Jeor BMR, then calories = TDEE ± goal adjustment

The Calorie Calculator is built on a well-established calculation method. It uses the formula Mifflin-St Jeor BMR, then calories = TDEE ± goal adjustment to turn your inputs into a reliable result. Determines how many calories you should eat each day to hit your goal. Enter your age, sex, height, weight, and activity level, plus your goal of losing, maintaining, or gaining weight, and the tool computes your The steps are shown on the page so you can follow the reasoning from input to output.

The calculator estimates BMR with a standard predictive equation, applies an activity multiplier to estimate TDEE, then adjusts calories for the chosen goal. It is a planning estimate, not a medical prescription.

What is the Calorie Calculator?

The Calorie Calculator is a free, browser-based health calculator tool that helps you Determines how many calories you should eat each day to hit your goal. Enter your age, sex, height, weight, and activity level, plus your goal of losing, mainta. Instead of working through the math by hand or in a spreadsheet, you enter your values and the calculator returns an accurate result instantly — while still showing the formula and the steps so you can verify the reasoning. It is designed for quick everyday use: no sign-up, no installation, and everything runs locally in your browser for complete privacy.

How to use the Calorie Calculator

Enter the required values into the input fields.
Press the calculate button — the result appears immediately, updated live as you change any value.
Read the step-by-step breakdown below the result to see exactly how the calculation was performed.
Use the interpretation guide to understand what the result means for your situation, and try different inputs to see how they change the outcome.

How to use the Calorie Calculator

Enter your age, sex, height, weight, and activity level, then choose your goal — lose, maintain, or gain weight — and the tool estimates your daily calories. It computes BMR with the Mifflin-St Jeor equation, applies the activity multiplier to get TDEE, then adjusts: calories = TDEE ± goal adjustment, typically ±500 calories per day for about 1 lb of change per week. For a 28-year-old woman, 165 cm, 65.8 kg with moderate activity, maintenance is roughly 2,100 calories, and a 1 lb/week loss target lands near 1,600.

Interpreting your result

The number is your starting daily target, not a fixed law — BMR equations carry roughly ±200-calorie individual variation, and the activity multiplier is a self-report estimate. A 500-calorie deficit produces about 1 lb of fat loss per week on average, but real weight loss follows a curve: the first week shows a larger drop (mostly water), and progress slows as you lose weight and your TDEE shrinks. The tool's breakdown shows BMR versus activity so you can see how much of your burn is automatic versus movement-based.

Common mistakes to avoid

The most common error is choosing a drastic deficit — cutting 1,000+ calories below maintenance is unsustainable and often backfires with muscle loss and rebound hunger. Second, overestimating activity level: most people are closer to 'lightly active' than 'very active'. Third, eating back every exercise calorie, which most trackers overestimate. Finally, never adjusting: the target is only valid at the weight and activity you entered, so recalculate after every 5 kg change and whenever your training volume shifts.

Tips for best results

Start with a moderate deficit (300–500 calories) and let the scale over 2–3 weeks confirm the rate. Track your actual intake honestly for a week — most people underestimate by 20–30%. Prioritize protein to preserve muscle during the deficit. Recalculate your maintenance every 5 kg of weight change. Use the maintenance number as your reference point: the deficit is only meaningful relative to it, and raising your activity level lets you eat more while still losing.

Authoritative source: U.S. Dietary Guidelines

Frequently asked questions

How do I use the calorie calculator?

Enter your age, sex, height, weight, and activity level, then choose your goal — lose, maintain, or gain. The tool computes your BMR with the Mifflin-St Jeor equation, applies the activity multiplier to get TDEE, and adjusts calories = TDEE ± goal adjustment (typically ±500 for a steady 1 lb per week). The result is a daily calorie target, not a medical prescription.

What formula does the calorie calculator use?

The Calorie Calculator uses the standard Mifflin-St Jeor BMR, then calories = TDEE ± goal adjustment. You enter your values, and the calculator applies the formula step by step, showing the working so you can verify the math and understand how the result is derived rather than trusting a black box.

Is the calorie calculator accurate?

The Calorie Calculator applies the standard formula: Mifflin-St Jeor BMR, then calories = TDEE ± goal adjustment. It is tested against published worked examples before launch and uses native double-precision arithmetic, so results are accurate to typical precision for the values you enter — with no intermediate rounding that could distort the answer.

Why do my results differ from another calculator?

The Calorie Calculator is free, private, and accurate: it runs entirely in your browser (no uploads, no accounts), applies the standard calculation, and explains each step so you can verify the result. Determines how many calories you should eat each day to hit your goal. Enter your age, sex, height, weight, and activity level, plus your goal of losing, maintaining, or gaining weight, and the tool computes your maintenance calories and a safe daily target There is no limit on usage, and it works on any device.

Can the calorie calculator replace professional advice?

No — it estimates calorie needs with the Mifflin-St Jeor equation and standard activity multipliers, but it is a population formula with roughly ±200-calorie individual variation, and it does not account for medical conditions, medications, or metabolic disorders. Use it as a starting point for planning, and consult a professional for medical, pregnancy, or athletic-performance nutrition.

What does the Calorie Calculator do?

Determines how many calories you should eat each day to hit your goal. Enter your age, sex, height, weight, and activity level, plus your goal of losing, maintaining, or gaining weight, and the tool computes your maintenance calories and a safe daily target. The calculator takes your inputs, applies the standard calculation, and returns a clear result so you can make an informed decision without doing the math by hand.

Is the Calorie Calculator free and private?

Yes — the Calorie Calculator. There is no sign-up, no paywall, no trial, and no limit on how many calculations you can run. CalcaTools covers its costs with non-intrusive display advertising, so the calculator itself never asks for payment or restricts any feature.

How accurate is the Calorie Calculator?

The Mifflin-St Jeor equation is the most accurate general BMR formula, with individual variation of about ±200 calories per day — roughly ±10%. The activity multiplier adds more uncertainty since activity levels are self-reported. As a practical plan, treat the result as a starting point, track your weight for 2–3 weeks, and adjust by 100–150 calories based on what the scale actually does.

Supporting reading

menu_book How Many Calories to Lose Weight

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