Calorie Calculator

The number of calories an adult needs per day varies by age, sex, body size, and physical activity level. New Zealand's Ministry of Health dietary guidelines reference estimated energy requirements aligned with international standards. As a general guide, adult women typically need around 1,800–2,200 kcal/day and adult men 2,200–2,800 kcal/day, with more active individuals needing more. The Ministry of Health's Eating and Activity Guidelines for New Zealand Adults recommend focusing on food quality and appropriate portions rather than counting calories directly. However, calorie awareness is a useful tool for weight management. New Zealand's adult obesity rates (around 34% of adults are obese) highlight the importance of energy balance. Individual needs should ideally be assessed by a registered dietitian. Source: NZ Ministry of Health — Eating and Activity Guidelines (health.govt.nz).

BMR (Basal Metabolic Rate) is the number of calories your body needs to maintain basic functions at complete rest — breathing, circulation, cell production, and temperature regulation. It represents the minimum energy required to stay alive and accounts for roughly 60–75% of total daily energy expenditure. TDEE (Total Daily Energy Expenditure) adds all activity on top of BMR — exercise, walking, work, and even digestion (the thermic effect of food). TDEE is the number you need to meet to maintain your current weight. Eating below TDEE creates a calorie deficit (weight loss); eating above TDEE creates a surplus (weight gain). Common BMR formulas include the Harris-Benedict equation and the Mifflin-St Jeor equation (generally considered more accurate for modern populations). Most calorie calculators use TDEE as their primary output. Source: EASO — European Association for the Study of Obesity; NZ MOH (health.govt.nz).

To lose weight sustainably, you need to consume fewer calories than you burn (a calorie deficit). A calorie calculator estimates your TDEE based on your height, weight, age, sex, and activity level. A commonly recommended deficit for safe, steady weight loss is 500 kcal/day below TDEE, which creates a loss of approximately 0.5 kg per week. Larger deficits are not recommended without medical supervision, as they can cause muscle loss, nutrient deficiencies, and metabolic slowdown. Once you know your target calorie intake, use a food diary app (e.g., MyFitnessPal) to track meals. Focus on nutrient-dense whole foods — vegetables, lean protein, legumes, and whole grains — which align with NZ Ministry of Health guidelines. Review and adjust every 4–6 weeks as your weight changes. Consult a GP or dietitian if you have health conditions. Source: NZ Ministry of Health (health.govt.nz).

The New Zealand Ministry of Health's Eating and Activity Guidelines for New Zealand Adults (updated 2020) provide evidence-based recommendations for healthy eating. Key guidelines include: eating a variety of foods from the four main food groups (vegetables and fruit; grain foods; milk and milk products; legumes, nuts, seeds, fish, eggs, poultry, and red meat); eating plenty of vegetables and fruit every day; choosing whole grains and high-fibre foods; choosing reduced-fat milk and dairy products; choosing lean meats and low-sodium options; limiting foods and drinks high in saturated fat, salt, and sugar; and drinking plenty of water. The guidelines also encourage regular physical activity of at least 150 minutes of moderate activity per week. No specific daily calorie target is mandated, as needs vary individually. Source: NZ Ministry of Health — Eating and Activity Guidelines (health.govt.nz).