Calorie Calculator

Calorie Calculator for Teenagers

Teenagers have higher calorie needs than adults due to growth and development. Getting nutrition right during adolescence supports physical development, brain function, and long-term health. This calculator provides age-appropriate guidance aligned with NHS recommendations.

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Use our calorie calculator with these considerations in mind.

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Key Considerations

NHS guideline: 13-15 year olds need approximately 2,000-2,400 kcal/day (girls) or 2,200-2,800 kcal/day (boys)
Active teenagers may need 300-500 additional calories per day
Calorie restriction or dieting is generally not recommended for growing teenagers
Growth spurts can temporarily increase calorie needs significantly
Quality of calories matters as much as quantity — nutrient-dense foods support development
Eating disorders are most likely to develop during adolescence — avoid restrictive messaging

Specific Adjustments

Growing Teens

If actively growing (height increasing), err on the side of eating more. Undereating during growth can permanently affect height and bone density.

Athletic Teens

Add 300-600 calories above baseline on training days. Focus on carbohydrates around training and adequate protein (1.4-2.0g/kg) for recovery.

Tips for Best Results

1Focus on eating enough nutritious food rather than counting calories precisely

2Aim for 3 meals and 2-3 snacks per day to meet energy needs

3Prioritise protein with every meal (meat, fish, eggs, dairy, beans)

4Do not skip breakfast — it supports concentration and energy throughout the day

5If concerned about weight, speak to a GP rather than restricting food independently

Frequently Asked Questions

Should teenagers count calories?

Generally no. Calorie counting can lead to unhealthy relationships with food during a vulnerable developmental period. Focus on eating balanced meals with variety rather than tracking numbers.

How much protein do teenagers need?

The NHS recommends teenagers consume protein from various sources at each meal. Active teenagers benefit from 1.4-2.0g per kg bodyweight daily, which can be met through normal eating.

Is it safe for teenagers to diet?

Restrictive dieting is not recommended for teenagers unless supervised by a healthcare professional. Growing bodies need adequate nutrition. If weight is a concern, speak to your GP for safe, supervised guidance.