Food Substitution Calorie Comparison Calculator
Compare the calories in a food with a lighter substitute and see how much you could save per meal, week and year.
Compare Your Options And Get Clear Answers
Compare the calories in a food with a lighter substitute and see how much you could save per meal, week and year.
Food Substitution Calorie Comparison Estimator
Enter your numbers below for an instant estimate.
How It Works
Key concepts behind this calculator
Portion Calories
Calories per 100 g multiplied by portion weight divided by 100.
Difference
Original calories minus substitute calories.
Weekly and Yearly Effect
Multiply by swaps per week and by 52, using about 7,700 kcal per kg of body weight.
Use As A Guide
Results are estimates based on your inputs. Check real quotes, rates and professional advice before deciding.
Common Food Swaps
Approximate calories per 100 g for popular swaps.
| Swap | Original (kcal/100 g) | Substitute (kcal/100 g) | Saving |
|---|---|---|---|
| White rice to cauliflower rice | 130 | 25 | About 80% |
| Pasta to courgette noodles | 158 | 17 | About 89% |
| Chips to baked sweet potato | 290 | 90 | About 69% |
| Ice cream to Greek yoghurt | 207 | 59 | About 71% |
| Cola to sparkling water | 42 | 0 | 100% |
| Rule of Thumb | Check label values | Watch portion size | Keep protein up |
Food Substitution Calorie Calculator FAQ
Answers to common questions about this calculator.
A common estimate is about 7,700 kcal per kg (3,500 kcal per pound), though real weight change varies between people.
Only if you do not compensate by eating more elsewhere. Portion size and overall diet matter as much as the swap itself.
Check the nutrition label or a national food composition database.
No. Consider protein, fibre, vitamins and how filling the food is, not just calories. This tool is general information and not medical advice.