Daily Calorie Calculator

Free tools / nutrition

Find a daily calorie starting point.

Estimate what it takes to maintain your weight, then explore realistic options for losing or gaining. Exercise matters, and this is a starting estimate—not a number you must hit perfectly every day.

A few details

About 1 minute. Estimates calculate here in your browser.

Think about your day outside scheduled workouts.
Separate from everyday movement so workouts are not counted twice. This is a rough activity adjustment, not measured exercise calories.

Important: This calculator is intended for adults aged 18 or older. It is not intended for people who are pregnant or breastfeeding. Results are general estimates, not individualized medical advice.

Your calorie guide

Numbers are daily averages, not exact daily limits.

kcal/day
Your estimates will appear here after you calculate. The layout stays in place.

Your selected goal

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A starting estimate

Maintain

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Estimated daily average

Moderate loss

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10–15% below maintenance; illustrative starting range

Gradual gain

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5–10% above maintenance; illustrative starting range

Daily Water & Fluids

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Drinks and other beverages, not plain water alone. One cup = 240 mL.

A general adult starting guide from US National Academies intake data, not an exact personal requirement.

Activity level, meal intake and daily routine can change your real needs. Your result will include a short note about uncertainty.

Method information will appear here after you calculate.

Calculating and copying stay in your browser. The optional email feature, when enabled, sends the entries needed for a server-recalculated copy.

Optional: show my daily macro examples

Illustrative adult eating patterns, not personalized protein requirements. Use the midpoint of your selected goal range.

Protein—
Carbs—
Fat—
Why show a higher-protein option?

Protein can help you feel satisfied, and adequate protein alongside resistance exercise may help retain muscle while losing weight. It is not automatically better for everyone, and more protein does not replace a varied diet.

Before making a major change, especially if you have kidney disease or another health condition, check that the plan suits you with a qualified dietitian or healthcare professional. Advice online, including ours, is a starting point—not a substitute for personal guidance.

4 kcal/g protein and carbohydrate; 9 kcal/g fat. These are example splits within established adult ranges, not individual requirements.

What these numbers mean

  • Maintenance is an average. Exercise, steps, sleep, illness and routine can change actual expenditure from one day to the next—sometimes noticeably, not always just by a small amount.
  • Moderate is the default. A faster-loss example is not a universally safe maximum. As your weight or activity changes, your needs can change too.
  • Look at trends. Recheck after a few weeks rather than reacting to every day’s fluctuations.
  • Fluids are a guide. Your fluid needs can change with activity, hot weather and health. Use this as a general guide, not a fixed amount you must drink. Other drinks count, and food provides some of your daily water. Plain water is a practical, calorie-free choice. Follow any individual medical fluid restriction instead.
  • Other calculators may differ. Mayo Clinic uses Harris–Benedict and Institute of Medicine methods; we use Mifflin–St Jeor with approximate activity factors. Neither gives your measured daily energy expenditure.
  • The loss/gain percentages and movement/exercise adjustments are examples, not medical prescriptions or guaranteed weight-change rates.
  • If you have a relevant medical condition, a history of disordered eating or nutritional concerns, get qualified individual advice. This tool is not intended for under-18s or pregnant/breastfeeding people.
  • Walking helps. A common benchmark is 10,000 steps per day, not a medical requirement; benefits can occur with fewer steps. A future article will explore Japanese interval walking.

Optional updates & what’s next

Practical food, without an expensive plan

Budget recipes are planned for later, after they have actually been cooked and tested. We’ll show ingredients, portions, estimated calories and the honest taste/texture result—not promise everyone likes the same food.

Method & sources

How it works: Mifflin–St Jeor estimates resting expenditure from age, weight, height and equation coefficient. We multiply by an approximate baseline daily-movement factor and add a small illustrative exercise-frequency adjustment to that factor. This split has not been validated as a separate clinical equation. It can overestimate/underestimate actual activity and should not double-count workouts.

The moderate (10–15%) and faster (15–20%) deficit examples and gradual surplus (5–10%) are editorial illustrations; they do not come from the resting-energy equation and do not predict a guaranteed weight-loss rate. The CDC discusses gradual loss of around 1–2 lb per week for many adults, but our percentages cannot verify that rate or its suitability for any person. Macro examples follow adult AMDR ranges, not individualized medical requirements.

Water and fluids: National Academies adult total-water figures include food as well as drinks. The approximately 13-cup/3.0 L and 9-cup/2.2 L figures shown here describe drinking water and other beverages; they are not the higher total-water figures and are not individual prescriptions. NHS guidance uses a different general framing and is not interchangeable with these US survey-derived values.

  1. Mifflin et al. (1990), predictive resting energy equation.
  2. NIH/NIDDK Body Weight Planner: changing energy needs and activity.
  3. CDC: gradual, sustainable weight loss.
  4. NHS: calorie guidance and practical context.
  5. National Academies: adult macronutrient ranges.
  6. Mayo Clinic: calorie calculator and estimation methods.
  7. Mayo Clinic: higher-protein diets and precautions.
  8. 2024 review: protein intake and muscle preservation during weight loss.
  9. US National Academies: water adequacy and drinks versus total-water intake.
  10. NHS: water, drinks and hydration guidance.
  11. CDC: water and healthier drinks.
  12. 2025 systematic review: health benefits below 10,000 daily steps.

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