eng Enviro Research Publishers Current Research in Nutrition and Food Science Journal 2347-467X 2322-0007 2026-04-10 14 1 447 459 10.12944/CRNFSJ.14.1.31 25226 article Shally Sharma 1 Vidisha Sharma 1 Anjani Bakshi 1 Ravinder Chadha 1 Department of Food and Nutrition, Lady Irwin College, University of Delhi, New Delhi, India Accuracy in food portion size estimation is essential for precise diet assessment and relevant nutrition counselling in dietetic practice. The study assessed food portion size estimation skill of post graduate dietetics students (n=54) selected purposively from three government institutions of Delhi, India. Students estimated pre-weighed portion sizes of 40 food items (raw and cooked) from different food categories and food types (amorphous, solid and liquid) in terms of household utensils and/or food exchanges. A total of 3240 portion size estimations were made by the students. Statistically significant difference in estimated and actual portion size was observed in 80% of the food items (p<0.05). Mean percent absolute error observed across all food categories when food items were estimated using food exchanges was 44.7±62.4% and using household utensils was 27.77±26.66%. Across all food categories, highest estimation error was observed for fruit juice (79.5±43.2%, when estimated using household utensils) and salads (74.9±87.3%, when estimated in terms of food exchanges). Lowest estimation error was observed for vegetables (23.7±66.3%, when estimated in terms of food exchanges and 18.0±19.19% using household utensils). Majority (87.5%) of the food items had >25% error when estimated using food exchanges while in terms of household utensils 45% of the items exceeded this much error. Mean percent absolute error was observed to be significantly lower when food items were estimated using household utensils than food exchanges (p<0.05). There is a need for improving portion size estimation skill among dietetics students through training. https://www.foodandnutritionjournal.org/volume14number1/food-portion-size-estimation-skill-among-post-graduate-dietetics-students/ Diet Dietary Assessment Dietetics Food Portion Size Portion Size Estimation