{"id":187997,"date":"2026-02-24T18:10:45","date_gmt":"2026-02-24T11:10:45","guid":{"rendered":"https:\/\/meeymap.com\/tin-tuc\/?p=187997"},"modified":"2026-02-24T18:13:57","modified_gmt":"2026-02-24T11:13:57","slug":"cach-tinh-bac-cau-thang-khi-xay-nha-chuan-ky-thuat-phong-thuy","status":"publish","type":"post","link":"https:\/\/meeymap.com\/tin-tuc\/cach-tinh-bac-cau-thang-khi-xay-nha-chuan-ky-thuat-phong-thuy","title":{"rendered":"C\u00e1ch T\u00ednh B\u1eadc C\u1ea7u Thang Khi X\u00e2y Nh\u00e0 \u2013 Chu\u1ea9n K\u1ef9 Thu\u1eadt &#038; Phong Th\u1ee7y"},"content":{"rendered":"<p data-start=\"386\" data-end=\"784\"><strong>C\u1ea7u thang<\/strong> l\u00e0 m\u1ed9t b\u1ed9 ph\u1eadn quan tr\u1ecdng trong ki\u1ebfn tr\u00fac nh\u00e0 \u1edf, kh\u00f4ng ch\u1ec9 k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c t\u1ea7ng m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh an to\u00e0n, th\u1ea9m m\u1ef9 v\u00e0 c\u1ea3 ngu\u1ed3n n\u0103ng l\u01b0\u1ee3ng \u2013 phong th\u1ee7y gia \u0111\u00ecnh. Vi\u1ec7c t\u00ednh s\u1ed1 b\u1eadc c\u1ea7u thang chu\u1ea9n khi x\u00e2y nh\u00e0 l\u00e0 \u0111i\u1ec1u b\u1eaft bu\u1ed9c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o di chuy\u1ec3n thu\u1eadn ti\u1ec7n, \u0111\u00fang ti\u00eau chu\u1ea9n x\u00e2y d\u1ef1ng v\u00e0 ph\u00f9 h\u1ee3p v\u1edbi quan ni\u1ec7m v\u1ec1 n\u0103ng l\u01b0\u1ee3ng t\u1ed1t l\u00e0nh.<\/p>\n<figure id=\"attachment_187998\" aria-describedby=\"caption-attachment-187998\" style=\"width: 750px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-Bac-Cau-Thang-Khi-Xay-Nha.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-187998\" src=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-Bac-Cau-Thang-Khi-Xay-Nha.jpg\" alt=\"C\u00e1ch T\u00ednh B\u1eadc C\u1ea7u Thang Khi X\u00e2y Nh\u00e0\" width=\"750\" height=\"500\" title=\"\" srcset=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-Bac-Cau-Thang-Khi-Xay-Nha.jpg 750w, https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-Bac-Cau-Thang-Khi-Xay-Nha-300x200.jpg 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/a><figcaption id=\"caption-attachment-187998\" class=\"wp-caption-text\">C\u00e1ch T\u00ednh B\u1eadc C\u1ea7u Thang Khi X\u00e2y Nh\u00e0<\/figcaption><\/figure>\n<h2 data-start=\"791\" data-end=\"839\">Thu\u1eadt Ng\u1eef C\u01a1 B\u1ea3n Khi T\u00ednh B\u1eadc C\u1ea7u Thang<\/h2>\n<p data-start=\"841\" data-end=\"907\">Tr\u01b0\u1edbc khi t\u00ednh, b\u1ea1n c\u1ea7n hi\u1ec3u c\u00e1c thu\u1eadt ng\u1eef d\u00f9ng trong c\u1ea7u thang:<\/p>\n<ul data-start=\"908\" data-end=\"1223\">\n<li data-start=\"908\" data-end=\"979\">\n<p data-start=\"910\" data-end=\"979\">B\u1eadc thang (riser): chi\u1ec1u cao t\u1eeb m\u1eb7t b\u1eadc n\u00e0y l\u00ean m\u1eb7t b\u1eadc k\u1ebf tr\u00ean<\/p>\n<\/li>\n<li data-start=\"980\" data-end=\"1051\">\n<p data-start=\"982\" data-end=\"1051\">Chi\u1ec1u s\u00e2u b\u1eadc (tread): ph\u1ea7n b\u1ec1 ngang m\u00e0 ch\u00e2n \u0111\u1eb7t l\u00ean khi \u0111i l\u00ean<\/p>\n<\/li>\n<li data-start=\"1052\" data-end=\"1131\">\n<p data-start=\"1054\" data-end=\"1131\">T\u1ed5ng Rise: kho\u1ea3ng c\u00e1ch t\u1eeb t\u1ea7ng d\u01b0\u1edbi l\u00ean t\u1ea7ng tr\u00ean m\u00e0 c\u1ea7u thang ph\u1ea3i ph\u1ee7<\/p>\n<\/li>\n<li data-start=\"1132\" data-end=\"1223\">\n<p data-start=\"1134\" data-end=\"1223\">T\u1ed5ng m\u1ee9c t\u0103ng: t\u1ed5ng chi\u1ec1u d\u00e0i c\u1ea7u thang tr\u00ean ph\u01b0\u01a1ng ngang<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"1230\" data-end=\"1289\">C\u00e1ch T\u00ednh S\u1ed1 B\u1eadc C\u1ea7u Thang Theo K\u1ef9 Thu\u1eadt X\u00e2y D\u1ef1ng<\/h2>\n<p><strong data-start=\"1299\" data-end=\"1326\">X\u00e1c \u0111\u1ecbnh chi\u1ec1u cao t\u1ea7ng<\/strong><\/p>\n<p data-start=\"1328\" data-end=\"1494\">Tr\u01b0\u1edbc h\u1ebft, \u0111o kho\u1ea3ng c\u00e1ch t\u1eeb s\u00e0n t\u1ea7ng n\u00e0y \u0111\u1ebfn s\u00e0n t\u1ea7ng k\u1ebf ti\u1ebfp. \u0110\u00e2y l\u00e0 <strong data-start=\"1134\" data-end=\"1142\">T\u1ed5ng m\u1ee9c t\u0103ng<\/strong>\u00a0m\u00e0 c\u1ea7u thang c\u1ea7n \u0111\u00e1p \u1ee9ng.<\/p>\n<p><strong data-start=\"1509\" data-end=\"1540\">Quy t\u1eafc k\u1ef9 thu\u1eadt ti\u00eau chu\u1ea9n<\/strong><\/p>\n<p data-start=\"1542\" data-end=\"1612\">Theo c\u00e1c ti\u00eau chu\u1ea9n x\u00e2y d\u1ef1ng v\u00e0 nh\u00e2n tr\u1eafc h\u1ecdc, b\u1eadc thang nh\u00e0 \u1edf n\u00ean c\u00f3:<\/p>\n<ul data-start=\"1614\" data-end=\"1770\">\n<li data-start=\"1614\" data-end=\"1672\">\n<p data-start=\"1616\" data-end=\"1672\">Chi\u1ec1u cao b\u1eadc (riser): ~15\u201318 cm l\u00e0 tho\u1ea3i m\u00e1i nh\u1ea5t<\/p>\n<\/li>\n<li data-start=\"1673\" data-end=\"1770\">\n<p data-start=\"1675\" data-end=\"1770\">Chi\u1ec1u s\u00e2u b\u1eadc (tread): ~25\u201330 cm \u0111\u1ec3 b\u01b0\u1edbc ch\u00e2n v\u1eeba v\u1eb7n<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"1772\" data-end=\"1896\">\u0110i\u1ec1u n\u00e0y gi\u00fap c\u1ea7u thang <strong data-start=\"1796\" data-end=\"1823\">an to\u00e0n v\u00e0 d\u1ec5 l\u00ean xu\u1ed1ng<\/strong> cho m\u1ecdi th\u00e0nh vi\u00ean trong gia \u0111\u00ecnh.<\/p>\n<p><strong data-start=\"1911\" data-end=\"1942\">C\u00f4ng th\u1ee9c t\u00ednh s\u1ed1 b\u1eadc thang<\/strong><\/p>\n<p data-start=\"1944\" data-end=\"2002\">C\u00f4ng th\u1ee9c ph\u1ed5 bi\u1ebfn \u0111\u1ec3 t\u00ednh s\u1ed1 b\u1eadc thang theo chi\u1ec1u cao l\u00e0:<\/p>\n<div class=\"w-full my-4\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border corner-superellipse\/1.1 border-token-border-light bg-token-bg-elevated-secondary rounded-3xl\">\n<div class=\"pointer-events-none absolute inset-x-px top-6 bottom-6\">\n<div class=\"sticky z-1!\">\n<div class=\"bg-token-bg-elevated-secondary sticky\">S\u1ed1 b\u1eadc = T\u1ed5ng chi\u1ec1u cao t\u1ea7ng \/ chi\u1ec1u cao m\u1ed7i b\u1eadc<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"2062\" data-end=\"2125\">V\u00ed d\u1ee5:<br data-start=\"2068\" data-end=\"2071\" \/>N\u1ebfu t\u1ea7ng cao 3,6 m (360 cm) v\u00e0 b\u1ea1n ch\u1ecdn b\u1eadc cao 18 cm:<\/p>\n<div class=\"w-full my-4\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border corner-superellipse\/1.1 border-token-border-light bg-token-bg-elevated-secondary rounded-3xl\">\n<div class=\"pointer-events-none absolute inset-x-px top-6 bottom-6\">\n<div class=\"sticky z-1!\">\n<div class=\"bg-token-bg-elevated-secondary sticky\">360 \u00f7 18 = 20 b\u1eadc<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"2154\" data-end=\"2313\">\u2192 Nh\u01b0 v\u1eady c\u1ea7u thang s\u1ebd c\u00f3 20 b\u1eadc, trong \u0111\u00f3 ph\u1ea7n \u0111\u00e0u ti\u00ean th\u01b0\u1eddng t\u00ednh t\u1eeb s\u00e0n t\u1ea7ng d\u01b0\u1edbi v\u00e0 b\u1eadc cu\u1ed1i ch\u00ednh l\u00e0 s\u00e0n t\u1ea7ng tr\u00ean.<\/p>\n<p><strong data-start=\"2328\" data-end=\"2366\">C\u00f4ng th\u1ee9c \u2013 t\u0103ng ti\u1ec7n nghi<\/strong><\/p>\n<p data-start=\"2368\" data-end=\"2478\">Ngo\u00e0i ra c\u00f2n c\u00f3 c\u00f4ng th\u1ee9c gi\u00fap ch\u1ecdn s\u1ef1 k\u1ebft h\u1ee3p gi\u1eefa chi\u1ec1u cao v\u00e0 chi\u1ec1u s\u00e2u b\u1eadc sao cho d\u1ec5 \u0111i nh\u1ea5t: 2 \u00d7 (chi\u1ec1u cao b\u1eadc) + (chi\u1ec1u s\u00e2u b\u1eadc) \u2248 60\u201365 cm<\/p>\n<div class=\"w-full my-4\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"\">\n<div class=\"\">V\u00ed d\u1ee5: N\u1ebfu chi\u1ec1u cao m\u1ed7i b\u1eadc l\u00e0 17,5 cm \u2192 th\u00ec chi\u1ec1u s\u00e2u b\u1eadc n\u00ean ~25\u201330 cm \u0111\u1ec3 t\u1ed5ng \u0111\u1ea1t ~63 cm \u2014 t\u1ea1o c\u1ea3m gi\u00e1c b\u01b0\u1edbc t\u1ef1 nhi\u00ean nh\u1ea5t.<\/div>\n<\/div>\n<div>\n<h2 data-pm-slice=\"0 0 []\">C\u00e1ch t\u00ednh b\u1eadc c\u1ea7u thang theo sinh l\u00e3o b\u1ec7nh t\u1eed<\/h2>\n<p data-start=\"72\" data-end=\"299\">Trong phong th\u1ee7y nh\u00e0 \u1edf, s\u1ed1 b\u1eadc c\u1ea7u thang th\u01b0\u1eddng \u0111\u01b0\u1ee3c t\u00ednh theo v\u00f2ng tu\u1ea7n ho\u00e0n Sinh \u2192 L\u00e3o \u2192 B\u1ec7nh \u2192 T\u1eed (4 cung l\u1eb7p l\u1ea1i). M\u1ee5c ti\u00eau l\u00e0 b\u1eadc cu\u1ed1i c\u00f9ng r\u01a1i v\u00e0o cung \u201cSinh\u201d (t\u1ed1t nh\u1ea5t), ho\u1eb7c \u00edt nh\u1ea5t tr\u00e1nh r\u01a1i v\u00e0o \u201cB\u1ec7nh\u201d v\u00e0 \u201cT\u1eed\u201d.<\/p>\n<p data-start=\"330\" data-end=\"391\">\u0110\u00e1nh s\u1ed1 b\u1eadc t\u1eeb 1 \u0111\u1ebfn h\u1ebft (t\u00ednh c\u1ea3 b\u1eadc cu\u1ed1i c\u00f9ng \u1edf t\u1ea7ng tr\u00ean).<\/p>\n<p data-start=\"393\" data-end=\"417\">C\u1ee9 4 b\u1eadc l\u1eb7p l\u1ea1i 1 v\u00f2ng:<\/p>\n<div class=\"TyagGW_tableContainer\">\n<div class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\">\n<table class=\"w-fit min-w-(--thread-content-width)\" data-start=\"419\" data-end=\"569\">\n<thead data-start=\"419\" data-end=\"439\">\n<tr data-start=\"419\" data-end=\"439\">\n<th class=\"\" data-start=\"419\" data-end=\"431\" data-col-size=\"sm\">S\u1ed1 th\u1ee9 t\u1ef1<\/th>\n<th class=\"\" data-start=\"431\" data-end=\"439\" data-col-size=\"sm\">Cung<\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"462\" data-end=\"569\">\n<tr data-start=\"462\" data-end=\"474\">\n<td data-start=\"462\" data-end=\"466\" data-col-size=\"sm\">1<\/td>\n<td data-col-size=\"sm\" data-start=\"466\" data-end=\"474\">Sinh<\/td>\n<\/tr>\n<tr data-start=\"475\" data-end=\"486\">\n<td data-start=\"475\" data-end=\"479\" data-col-size=\"sm\">2<\/td>\n<td data-col-size=\"sm\" data-start=\"479\" data-end=\"486\">L\u00e3o<\/td>\n<\/tr>\n<tr data-start=\"487\" data-end=\"499\">\n<td data-start=\"487\" data-end=\"491\" data-col-size=\"sm\">3<\/td>\n<td data-col-size=\"sm\" data-start=\"491\" data-end=\"499\">B\u1ec7nh<\/td>\n<\/tr>\n<tr data-start=\"500\" data-end=\"510\">\n<td data-start=\"500\" data-end=\"504\" data-col-size=\"sm\">4<\/td>\n<td data-col-size=\"sm\" data-start=\"504\" data-end=\"510\">T\u1eed<\/td>\n<\/tr>\n<tr data-start=\"511\" data-end=\"523\">\n<td data-start=\"511\" data-end=\"515\" data-col-size=\"sm\">5<\/td>\n<td data-col-size=\"sm\" data-start=\"515\" data-end=\"523\">Sinh<\/td>\n<\/tr>\n<tr data-start=\"524\" data-end=\"535\">\n<td data-start=\"524\" data-end=\"528\" data-col-size=\"sm\">6<\/td>\n<td data-col-size=\"sm\" data-start=\"528\" data-end=\"535\">L\u00e3o<\/td>\n<\/tr>\n<tr data-start=\"536\" data-end=\"548\">\n<td data-start=\"536\" data-end=\"540\" data-col-size=\"sm\">7<\/td>\n<td data-col-size=\"sm\" data-start=\"540\" data-end=\"548\">B\u1ec7nh<\/td>\n<\/tr>\n<tr data-start=\"549\" data-end=\"559\">\n<td data-start=\"549\" data-end=\"553\" data-col-size=\"sm\">8<\/td>\n<td data-col-size=\"sm\" data-start=\"553\" data-end=\"559\">T\u1eed<\/td>\n<\/tr>\n<tr data-start=\"560\" data-end=\"569\">\n<td data-start=\"560\" data-end=\"564\" data-col-size=\"sm\">\u2026<\/td>\n<td data-col-size=\"sm\" data-start=\"564\" data-end=\"569\">\u2026<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p data-start=\"571\" data-end=\"590\">C\u00f4ng th\u1ee9c nhanh: S\u1ed1 b\u1eadc = 4n + 1 (n = 0,1,2,3\u2026)<\/p>\n<p data-start=\"630\" data-end=\"659\">Nh\u1eefng s\u1ed1 b\u1eadc \u0111\u1eb9p th\u01b0\u1eddng d\u00f9ng:<\/p>\n<ul data-start=\"660\" data-end=\"727\">\n<li data-start=\"660\" data-end=\"676\">\n<p data-start=\"662\" data-end=\"676\">13 b\u1eadc (4\u00d73+1)<\/p>\n<\/li>\n<li data-start=\"677\" data-end=\"693\">\n<p data-start=\"679\" data-end=\"693\">17 b\u1eadc (4\u00d74+1)<\/p>\n<\/li>\n<li data-start=\"694\" data-end=\"710\">\n<p data-start=\"696\" data-end=\"710\">21 b\u1eadc (4\u00d75+1)<\/p>\n<\/li>\n<li data-start=\"711\" data-end=\"727\">\n<p data-start=\"713\" data-end=\"727\">25 b\u1eadc (4\u00d76+1)<\/p>\n<\/li>\n<\/ul>\n<p><strong>V\u00ed d\u1ee5 th\u1ef1c t\u1ebf<\/strong><\/p>\n<ul data-start=\"756\" data-end=\"924\">\n<li data-start=\"756\" data-end=\"842\">\n<p data-start=\"758\" data-end=\"842\">N\u1ebfu c\u1ea7u thang c\u00f3 <strong data-start=\"775\" data-end=\"785\">17 b\u1eadc<\/strong><br data-start=\"785\" data-end=\"788\" \/>\u2192 17 chia 4 d\u01b0 1<br data-start=\"806\" data-end=\"809\" \/>\u2192 r\u01a1i v\u00e0o <strong data-start=\"821\" data-end=\"834\">cung Sinh<\/strong> \u2705 (t\u1ed1t)<\/p>\n<\/li>\n<li data-start=\"844\" data-end=\"924\">\n<p data-start=\"846\" data-end=\"924\">N\u1ebfu c\u00f3 <strong data-start=\"853\" data-end=\"863\">16 b\u1eadc<\/strong><br data-start=\"863\" data-end=\"866\" \/>\u2192 16 chia 4 d\u01b0 0<br data-start=\"884\" data-end=\"887\" \/>\u2192 r\u01a1i v\u00e0o <strong data-start=\"899\" data-end=\"910\">cung T\u1eed<\/strong> \u274c (kh\u00f4ng t\u1ed1t)<\/p>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h2 data-start=\"2710\" data-end=\"2756\">Ti\u00eau Chu\u1ea9n C\u1ea7u Thang Theo X\u00e2y D\u1ef1ng<\/h2>\n<p data-start=\"2758\" data-end=\"2841\">Khi t\u00ednh s\u1ed1 b\u1eadc, b\u1ea1n c\u0169ng n\u00ean tham kh\u1ea3o c\u00e1c ti\u00eau chu\u1ea9n an to\u00e0n cho c\u1ea7u thang:<\/p>\n<ul data-start=\"2843\" data-end=\"3123\">\n<li data-start=\"2843\" data-end=\"2884\">\n<p data-start=\"2845\" data-end=\"2884\">Chi\u1ec1u cao b\u1eadc t\u1ed1i \u0111a kho\u1ea3ng 18 cm<\/p>\n<\/li>\n<li data-start=\"2885\" data-end=\"2929\">\n<p data-start=\"2887\" data-end=\"2929\">Chi\u1ec1u s\u00e2u b\u1eadc t\u1ed1i thi\u1ec3u kho\u1ea3ng 25 cm<\/p>\n<\/li>\n<li data-start=\"2930\" data-end=\"3012\">\n<p data-start=\"2932\" data-end=\"3012\">Chi\u1ec1u r\u1ed9ng th\u00e2n thang n\u00ean kho\u1ea3ng t\u1eeb 0,9 m \u0111\u1ebfn 1,2 m \u0111\u1ec3 di chuy\u1ec3n tho\u1ea3i m\u00e1i<\/p>\n<\/li>\n<li data-start=\"3013\" data-end=\"3123\">\n<p data-start=\"3015\" data-end=\"3123\">G\u00f3c d\u1ed1c l\u00fd t\u01b0\u1edfng th\u01b0\u1eddng n\u1eb1m trong kho\u1ea3ng t\u1eeb 30\u00b0\u201337\u00b0 \u0111\u1ec3 d\u1ec5 \u0111i l\u00ean xu\u1ed1ng<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3125\" data-end=\"3214\">Nh\u1eefng ti\u00eau chu\u1ea9n n\u00e0y gi\u00fap c\u1ea7u thang an to\u00e0n, kh\u00f4ng qu\u00e1 d\u1ed1c, ph\u00f9 h\u1ee3p v\u1edbi m\u1ecdi l\u1ee9a tu\u1ed5i.<\/p>\n<h2 data-start=\"3221\" data-end=\"3273\">C\u00e1ch T\u00ednh S\u1ed1 B\u1eadc C\u1ea7u Thang Theo Phong Th\u1ee7y<\/h2>\n<p data-start=\"3275\" data-end=\"3479\">Ngo\u00e0i k\u1ef9 thu\u1eadt x\u00e2y d\u1ef1ng, nhi\u1ec1u gia \u0111\u00ecnh Vi\u1ec7t c\u00f2n t\u00ednh s\u1ed1 b\u1eadc c\u1ea7u thang theo <strong data-start=\"3351\" data-end=\"3399\">quy lu\u1eadt phong th\u1ee7y \u201cSinh \u2013 L\u00e3o \u2013 B\u1ec7nh \u2013 T\u1eed\u201d<\/strong> \u0111\u1ec3 mong c\u1ea7u t\u00e0i l\u1ed9c, s\u1ee9c kh\u1ecfe v\u00e0 b\u00ecnh an.<\/p>\n<figure id=\"attachment_187999\" aria-describedby=\"caption-attachment-187999\" style=\"width: 765px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-So-Bac-Cau-Thang-Theo-Phong-Thuy.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-187999\" src=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-So-Bac-Cau-Thang-Theo-Phong-Thuy.jpg\" alt=\"C\u00e1ch T\u00ednh S\u1ed1 B\u1eadc C\u1ea7u Thang Theo Phong Th\u1ee7y\" width=\"765\" height=\"417\" title=\"\" srcset=\"https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-So-Bac-Cau-Thang-Theo-Phong-Thuy.jpg 765w, https:\/\/meeymap.com\/tin-tuc\/wp-content\/uploads\/2026\/02\/Cach-Tinh-So-Bac-Cau-Thang-Theo-Phong-Thuy-300x164.jpg 300w\" sizes=\"auto, (max-width: 765px) 100vw, 765px\" \/><\/a><figcaption id=\"caption-attachment-187999\" class=\"wp-caption-text\">C\u00e1ch T\u00ednh S\u1ed1 B\u1eadc C\u1ea7u Thang Theo Phong Th\u1ee7y<\/figcaption><\/figure>\n<p><strong>C\u00f4ng th\u1ee9c phong th\u1ee7y ph\u1ed5 bi\u1ebfn<\/strong><\/p>\n<p data-start=\"3519\" data-end=\"3564\">Quy lu\u1eadt n\u00e0y chia v\u00f2ng \u0111i l\u00ean th\u00e0nh 4 cung:<\/p>\n<ul data-start=\"3565\" data-end=\"3627\">\n<li data-start=\"3565\" data-end=\"3585\">\n<p data-start=\"3567\" data-end=\"3585\">1 = Sinh (t\u1ed1t)<\/p>\n<\/li>\n<li data-start=\"3586\" data-end=\"3599\">\n<p data-start=\"3588\" data-end=\"3599\">2 = L\u00e3o<\/p>\n<\/li>\n<li data-start=\"3600\" data-end=\"3614\">\n<p data-start=\"3602\" data-end=\"3614\">3 = B\u1ec7nh<\/p>\n<\/li>\n<li data-start=\"3615\" data-end=\"3627\">\n<p data-start=\"3617\" data-end=\"3627\">4 = T\u1eed<\/p>\n<\/li>\n<\/ul>\n<p data-start=\"3629\" data-end=\"3711\">Sau \u0111\u00f3 ti\u1ebfp t\u1ee5c chu k\u1ef3 Sinh\u2013L\u00e3o\u2013B\u1ec7nh\u2013T\u1eed\u2026 V\u00ec v\u1eady, s\u1ed1 b\u1eadc theo phong th\u1ee7y \u0111\u1eb9p s\u1ebd l\u00e0:<\/p>\n<div class=\"w-full my-4\">\n<div class=\"\">\n<div class=\"relative\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"h-full min-h-0 min-w-0\">\n<div class=\"border corner-superellipse\/1.1 border-token-border-light bg-token-bg-elevated-secondary rounded-3xl\">\n<div class=\"pointer-events-none absolute inset-x-px top-6 bottom-6\">\n<div class=\"sticky z-1!\">\n<div class=\"bg-token-bg-elevated-secondary sticky\">S\u1ed1 b\u1eadc = 4n + 1<\/div>\n<ul>\n<li>Trong \u0111\u00f3 \u201cn\u201d l\u00e0 s\u1ed1 chu k\u1ef3 l\u1eb7p l\u1ea1i. V\u00ed d\u1ee5: 4\u00d74 + 1 = 17 b\u1eadc r\u01a1i v\u00e0o cung Sinh (nhi\u1ec1u ng\u01b0\u1eddi coi l\u00e0 may m\u1eafn).<\/li>\n<li>M\u1ed9t s\u1ed1 con s\u1ed1 \u0111\u1eb9p \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi \u00e1p d\u1ee5ng: 17, 21, 25,\u2026 \u2014 t\u1ea5t c\u1ea3 \u0111\u1ec1u r\u01a1i v\u00e0o cung Sinh theo quy lu\u1eadt tr\u00ean.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p data-start=\"4043\" data-end=\"4159\">L\u01b0u \u00fd: Phong th\u1ee7y kh\u00f4ng ho\u00e0n to\u00e0n quy\u1ebft \u0111\u1ecbnh k\u1ef9 thu\u1eadt m\u00e0 n\u00ean k\u1ebft h\u1ee3p v\u1edbi ti\u00eau chu\u1ea9n x\u00e2y d\u1ef1ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n.<\/p>\n<h2 data-start=\"4166\" data-end=\"4202\">V\u00ed D\u1ee5 T\u00ednh S\u1ed1 B\u1eadc C\u1ea7u Thang<\/h2>\n<p data-start=\"4204\" data-end=\"4276\">Gi\u1ea3 s\u1eed t\u1ea7ng cao l\u00e0 3,15 m (315 cm) v\u00e0 b\u1ea1n mu\u1ed1n b\u1eadc thang cao ~15 cm: 315 \u00f7 15 = 21 b\u1eadc \u2192 Nh\u01b0 v\u1eady s\u1ed1 b\u1eadc l\u00e0 21 \u2014 v\u1eeba \u0111\u00fang ti\u00eau chu\u1ea9n k\u1ef9 thu\u1eadt v\u1eeba r\u01a1i v\u00e0o cung Sinh phong th\u1ee7y theo quy lu\u1eadt 4n+1.<\/p>\n<h2 data-start=\"4462\" data-end=\"4500\">L\u01b0u \u00dd Khi T\u00ednh B\u1eadc C\u1ea7u Thang<\/h2>\n<ul>\n<li data-start=\"4502\" data-end=\"4903\">Th\u01b0\u1eddng ch\u1ecdn b\u1eadc l\u1ebb h\u01a1n b\u1eadc ch\u1eb5n v\u00ec phong th\u1ee7y coi s\u1ed1 l\u1ebb t\u1ea1o s\u1ef1 th\u0103ng ti\u1ebfn h\u01a1n.<\/li>\n<li data-start=\"4502\" data-end=\"4903\">Khi chi\u1ec1u cao t\u1ea7ng kh\u00f4ng chia \u0111\u1ec1u theo k\u00edch th\u01b0\u1edbc b\u1eadc chu\u1ea9n, b\u1ea1n c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh chi\u1ec1u cao b\u1eadc nh\u1ecf h\u01a1n ho\u1eb7c l\u1edbn h\u01a1n ch\u00fat \u00edt \u0111\u1ec3 \u0111\u1ea1t s\u1ed1 b\u1eadc t\u1ed1t nh\u1ea5t.<\/li>\n<li data-start=\"4502\" data-end=\"4903\">Lu\u00f4n ch\u1ecdn k\u00edch th\u01b0\u1edbc ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m ng\u01b0\u1eddi s\u1eed d\u1ee5ng \u2014 ng\u01b0\u1eddi gi\u00e0, tr\u1ebb nh\u1ecf n\u00ean b\u1eadc th\u1ea5p v\u00e0 s\u00e2u h\u01a1n \u0111\u1ec3 d\u1ec5 \u0111i.<\/li>\n<\/ul>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-right kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;right&quot;,&quot;id&quot;:&quot;187997&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;\u0110\u00e1nh gi\u00e1 post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 b\u00ecnh ch\u1ecdn)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;C\u00e1ch T\u00ednh B\u1eadc C\u1ea7u Thang Khi X\u00e2y Nh\u00e0 \u2013 Chu\u1ea9n K\u1ef9 Thu\u1eadt \\u0026amp; Phong Th\u1ee7y&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">\u0110\u00e1nh gi\u00e1 post<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>C\u1ea7u thang l\u00e0 m\u1ed9t b\u1ed9 ph\u1eadn quan tr\u1ecdng trong ki\u1ebfn tr\u00fac nh\u00e0 \u1edf, kh\u00f4ng ch\u1ec9 k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c t\u1ea7ng m\u00e0 c\u00f2n \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh an to\u00e0n,&#8230; <\/p>\n","protected":false},"author":1,"featured_media":187998,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[295],"tags":[],"class_list":["post-187997","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha"],"_links":{"self":[{"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/187997","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/comments?post=187997"}],"version-history":[{"count":4,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/187997\/revisions"}],"predecessor-version":[{"id":188003,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/posts\/187997\/revisions\/188003"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/media\/187998"}],"wp:attachment":[{"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/media?parent=187997"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/categories?post=187997"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/meeymap.com\/tin-tuc\/wp-json\/wp\/v2\/tags?post=187997"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}