ABSTRACT 1. The regression method was used to estimate the utilisation of energy (Experiment 1) and phosphorus (Experiments 2 and 3) in two field peas (FP) cultivars fed to broiler chickens. 2. On d 17 post hatching, 240 birds were assigned to one of five experimental diets in a randomised complete block design with body weight (BW) as a blocking factor in Experiment 1. Whereas, 192 birds were allotted to one of three experimental diets on d 19 post-hatching in Experiments 2 and 3. There were eight replicate cages per diet, with six birds per cage in Experiment 1 and eight birds per cage in Experiments 2 and 3. 3. Field pea cultivars Hampton (FPH) or 4010 (FP4) was incorporated at either 150 or 300 g/kg into a maize-soybean meal-based reference diet in Experiment 1. Using semi-purified diets, FPH was included at 200, 400, or 600 g/kg in Experiment 2, whereas FP4 was included at 215, 430 or 645 g/kg in Experiment 3. 4. In Experiment 1 a linear decrease (P < 0.01) was observed in metabolisable energy (ME) and nitrogen-corrected ME (MEn) with inclusion of FPH in the diets, whereas both linear and quadratic effects (P < 0.05) were observed with inclusion of FP4. The regression-determined ileal digestible energy, ME and MEn were 13.70, 12.69 and 11.93 MJ/kg DM in FPH and 12.63, 13.20 and 12.52 MJ/kg DM in FP4, respectively. The ileal digestible and retainable P intakes were linearly increased (P < 0.01) with higher inclusion of FPH and FP4 in Experiments 2 and 3, respectively. The respective true ileal digestibility and true total tract utilisation of P in FPH were 74.6% and 68.3% and for FP4 were 74.3% and 61.7%, respectively. In conclusion, the estimated energy and P utilisation values could be used in diet formulations.