The　anatomically　specific　natural　convective　heat　transfer　coefficient　(hnc)　is　a　key　index　in　the　completion　of　a　comprehensive　model　of　human　thermoregulation　and　thermal　comfort　prediction.　This　study　aims　to　obtain　empirically　verified　hnc　on　body　surface　in　both　standing　and　sitting　postures,　and　to　generate　equations　of　hnc　for　typical　indoor　situations.　A　thermal　manikin　consisting　of　22　discrete　body　segments　was　exposed　to　a　wide　range　of　skin-to-air　temperature　gradients　(ts-ta)　from　2　to　20　°C,　at　an　interval　of　2　°C.　The　hnc　measured　for　individual　segments　fell　within　the　range　of　0.9–5.5　and　0.9–5.4　W/(m2·°C)　when　standing　and　sitting,　respectively.　Regardless　of　postures　and　temperature　conditions,　local　hnc　values　exhibited　a　consistently　increasing　trend　from　central　to　extremity　regions,　following　the　order　of　trunk,　head,　lower　limb,　and　upper　limb.　Compared　to　standing　posture,　sitting　enlarged　hnc　over　front　trunk　by　an　average　of　1.0　W/(m2·°C)　across　various　temperature　conditions,　while　reduced　hnc　in　back　trunk　and　lower　limbs　by　0.8　and　0.3　W/(m2·°C)　respectively　due　to　chair　contact.　As　a　result,　the　whole-body　hnc　was　higher　for　standing　at　3.6　±　0.6　W/(m2·°C)　compared　to　sitting　at　3.5　±　0.5　W/(m2·°C).　Predictive　models　of　the　whole-body　hnc　were　established　based　on　finite　segment　points　weighting　method,　which　offered　strong　generalization　ability　with　an　error　of　less　than　5　%.　Moreover,　regression　function　of　the　whole-body　hnc　on　skin-to-air　temperature　gradient　was　hnc=2.05(ts-ta)0.25　for　standing　and　hnc=2.09(ts-ta)0.22　for　sitting　posture.　©　2024　Elsevier　B.V.