Free Calorie Calculator

Inputs stay in this page. Estimates are for adults; pregnancy, breastfeeding, eating disorders and medical conditions need individual advice. A calculator does not prescribe an intake or predict a weight-loss date.

How this calorie calculator works

Resting estimate = 10 × kg + 6.25 × cm − 5 × age + sex constant (+5 male, −161 female). Maintenance = resting estimate × activity factor.

Worked example

A 30-year-old woman at 70 kg, 170 cm and activity factor 1.55 has an estimated maintenance intake of 2,250 kcal/day. A 10% reduction is about 2,025 kcal/day; it is a scenario to review against your trend.

Calculation reference ↗

Use the estimate in your daily routine

A number becomes useful when you can compare it with what you actually eat. BiteCal helps reduce manual entry with AI meal-photo estimates you review before saving. Keep the reference calculation separate from your actual logged meals; neither a formula nor a photo guarantees exact intake or weight change.

Explore related BiteCal tools

Less manual entry. A meal diary you can review.

Start with BiteCal when you want to make everyday food logging easier. Photograph your meal, review detected foods and estimated calories, protein, carbs and fat, then save your daily diary entry. Check portions and hidden additions before saving.

Use our free website calculators to understand the numbers, then bring the routine into BiteCal. Photo estimates are a starting point, with the review step keeping you in control.

BiteCal is free to download with in-app purchases. Full access requires an active subscription; current options and renewal terms are shown before purchase. Calculators on this website are free and need no account.

See how BiteCal works →