{"id":963,"date":"2026-01-24T01:14:42","date_gmt":"2026-01-24T01:14:42","guid":{"rendered":"https:\/\/kairosshop.pt\/blog\/?p=963"},"modified":"2026-01-24T01:14:44","modified_gmt":"2026-01-24T01:14:44","slug":"faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida","status":"publish","type":"post","link":"https:\/\/kairosshop.pt\/blog\/faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida\/","title":{"rendered":"Faturar 10.000\u20ac e Lucrar Zero? A Matem\u00e1tica do E-commerce que Ningu\u00e9m Te Conta (ROAS, CPA e Margem L\u00edquida)"},"content":{"rendered":"\n<p><strong>Introdu\u00e7\u00e3o: A Ilus\u00e3o do Print do Shopify<\/strong><\/p>\n\n\n\n<p>Todos os dias v\u00eas no Instagram algu\u00e9m a mostrar um telem\u00f3vel com a notifica\u00e7\u00e3o: <em>&#8220;Vendas de hoje: 1.000\u20ac&#8221;<\/em>. O que ningu\u00e9m te mostra \u00e9 a outra notifica\u00e7\u00e3o: <em>&#8220;Gastos de hoje: 1.200\u20ac&#8221;<\/em>.<\/p>\n\n\n\n<p>No mundo do Dropshipping, \u00e9 muito f\u00e1cil faturar muito e <strong>perder dinheiro<\/strong>. Muitos empreendedores chegam \u00e0 Kair\u00f3s desesperados: <em>&#8220;Estou a vender 10k por m\u00eas, mas a minha conta banc\u00e1ria est\u00e1 vazia. O que se passa?&#8221;<\/em> O que se passa \u00e9 que eles n\u00e3o sabem a diferen\u00e7a entre <strong>Fatura\u00e7\u00e3o<\/strong> (Volume) e <strong>Margem<\/strong> (Lucro). Hoje, vamos largar a emo\u00e7\u00e3o e olhar para a matem\u00e1tica fria.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-full\"><img  title=\"\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"559\" src=\"https:\/\/kairosshop.pt\/blog\/wp-content\/uploads\/2026\/01\/vendas-222.jpg\"  alt=\"vendas-222 Faturar 10.000\u20ac e Lucrar Zero? A Matem\u00e1tica do E-commerce que Ningu\u00e9m Te Conta (ROAS, CPA e Margem L\u00edquida)\"  class=\"wp-image-964\" srcset=\"https:\/\/kairosshop.pt\/blog\/wp-content\/uploads\/2026\/01\/vendas-222.jpg 1024w, https:\/\/kairosshop.pt\/blog\/wp-content\/uploads\/2026\/01\/vendas-222-300x164.jpg 300w, https:\/\/kairosshop.pt\/blog\/wp-content\/uploads\/2026\/01\/vendas-222-768x419.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1. A Anatomia de uma Venda (Para onde vai o dinheiro?)<\/h3>\n\n\n\n<p>Vamos imaginar que vendes um <strong>Rel\u00f3gio Inteligente<\/strong> por <strong>40,00\u20ac<\/strong>. O dinheiro entra na tua conta. Est\u00e1s rico? N\u00e3o. Antes de pagares an\u00fancios, tens de descontar os &#8220;Custos Invis\u00edveis&#8221;:<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>CMV (Custo da Mercadoria Vendida):<\/strong> O chin\u00eas cobra-te <strong>12,00\u20ac<\/strong> pelo rel\u00f3gio.<\/li>\n\n\n\n<li><strong>Frete (Envio):<\/strong> O envio YunExpress custa <strong>5,00\u20ac<\/strong>.<\/li>\n\n\n\n<li><strong>Taxas de Transa\u00e7\u00e3o:<\/strong> O Shopify, o Ifthenpay (MBWAY) ou o Stripe ficam com cerca de <strong>3%<\/strong> + taxas fixas. Digamos <strong>1,50\u20ac<\/strong>.<\/li>\n<\/ol>\n\n\n\n<p><strong>C\u00e1lculo da Margem Bruta:<\/strong> 40\u20ac (Venda) &#8211; 12\u20ac (Produto) &#8211; 5\u20ac (Frete) &#8211; 1,50\u20ac (Taxas) = <strong>21,50\u20ac<\/strong>. Estes 21,50\u20ac s\u00e3o a tua <strong>Margem de Contribui\u00e7\u00e3o<\/strong>. \u00c9 o que te sobra para &#8220;comprar o cliente&#8221;.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">2. O CPA M\u00e1ximo (Quanto podes pagar por um cliente?)<\/h3>\n\n\n\n<p>Aqui \u00e9 onde a maioria perde o jogo no Facebook Ads. Se a tua margem \u00e9 <strong>21,50\u20ac<\/strong>, isso significa que o teu <strong>CPA (Custo Por Aquisi\u00e7\u00e3o)<\/strong> no Facebook tem de ser <strong>inferior a 21,50\u20ac<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Se gastares 10\u20ac em an\u00fancios para vender um rel\u00f3gio -> <strong>Lucras 11,50\u20ac<\/strong>. (Excelente!)<\/li>\n\n\n\n<li>Se gastares 21,50\u20ac em an\u00fancios -> <strong>Lucras 0\u20ac<\/strong>. (Trabalhaste de gra\u00e7a).<\/li>\n\n\n\n<li>Se gastares 25\u20ac em an\u00fancios -> <strong>Preju\u00edzo de 3,50\u20ac<\/strong>. (Est\u00e1s a pagar para vender).<\/li>\n<\/ul>\n\n\n\n<p><strong><a href=\"https:\/\/kairosshop.pt\/ads\/\" data-type=\"link\" data-id=\"https:\/\/kairosshop.pt\/ads\/\">Regra Kair\u00f3s<\/a>:<\/strong> O teu objetivo inicial deve ser ter um CPA que seja, no m\u00e1ximo, <strong>50% da tua margem<\/strong>. No exemplo acima, deverias apontar para um CPA de <strong>10,75\u20ac<\/strong>.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3. O Mito do ROAS (Return On Ad Spend)<\/h3>\n\n\n\n<p>Muitos gestores de tr\u00e1fego dizem: <em>&#8220;Conseguimos um ROAS de 2.0! \u00c9 \u00f3timo!&#8221;<\/em>. Ser\u00e1? Vamos fazer as contas.<\/p>\n\n\n\n<p><strong>ROAS 2.0<\/strong> significa que a cada 1\u20ac investido, voltaram 2\u20ac em vendas. No nosso exemplo: Investiste 20\u20ac em ads e vendeste 40\u20ac (o rel\u00f3gio).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fatura\u00e7\u00e3o: 40\u20ac<\/li>\n\n\n\n<li>Custo Ads: 20\u20ac<\/li>\n\n\n\n<li>Custos Produto\/Taxas: 18,50\u20ac<\/li>\n\n\n\n<li><strong>Lucro Final: 1,50\u20ac<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Vale a pena todo o esfor\u00e7o de suporte, gest\u00e3o e risco por 1,50\u20ac? Provavelmente n\u00e3o. Para este produto, um ROAS de 2.0 \u00e9 <strong><a href=\"https:\/\/kairosshop.pt\/ads\/\" data-type=\"link\" data-id=\"https:\/\/kairosshop.pt\/ads\/\">sobreviv\u00eancia<\/a><\/strong>. Para teres lucro real, precisarias de um ROAS de <strong>3.0 ou 4.0<\/strong>. N\u00e3o olhes para o ROAS como um n\u00famero m\u00e1gico. O ROAS ideal depende da tua margem.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">4. O Buraco Negro: Devolu\u00e7\u00f5es e Impostos<\/h3>\n\n\n\n<p>Se achavas que a matem\u00e1tica acabava ali, enganaste-te.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Devolu\u00e7\u00f5es:<\/strong> Em Portugal, a taxa m\u00e9dia de devolu\u00e7\u00e3o no e-commerce ronda os <strong>5% a 10%<\/strong>. Se 1 em cada 10 clientes devolver o rel\u00f3gio, tens de devolver os 40\u20ac, mas j\u00e1 gastaste o dinheiro nos an\u00fancios e no envio.<\/li>\n\n\n\n<li><strong>Impostos:<\/strong> Se lucrares no final do ano, a Autoridade Tribut\u00e1ria vai querer a parte dela (IRS\/IRC).<\/li>\n<\/ul>\n\n\n\n<p>Se n\u00e3o tiveres uma &#8220;almofada&#8221; financeira nas tuas margens, uma semana m\u00e1 de devolu\u00e7\u00f5es pode falir a empresa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. A Solu\u00e7\u00e3o: LTV (Lifetime Value)<\/h3>\n\n\n\n<p>Como \u00e9 que as grandes lojas sobrevivem com custos de an\u00fancios t\u00e3o altos? Elas n\u00e3o lucram na primeira venda. Elas usam o <strong>E-mail Marketing<\/strong> e o <strong>SMS<\/strong> (Klaviyo\/SMSBump) para vender uma segunda vez ao mesmo cliente, <strong>sem gastar 1\u20ac em an\u00fancios<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Venda 1 (Com Ads): Lucro 0\u20ac.<\/li>\n\n\n\n<li>Venda 2 (Por E-mail, 30 dias depois): Lucro 20\u20ac.<\/li>\n\n\n\n<li>Venda 3 (Natal): Lucro 20\u20ac.<\/li>\n<\/ul>\n\n\n\n<p>O segredo da riqueza n\u00e3o \u00e9 vender uma vez a mil pessoas. \u00c9 vender tr\u00eas vezes \u00e0 mesma pessoa.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclus\u00e3o: S\u00ea um Gestor, n\u00e3o um Apostador<\/h3>\n\n\n\n<p>O <a href=\"https:\/\/kairosshop.pt\/ads\/\" data-type=\"link\" data-id=\"https:\/\/kairosshop.pt\/ads\/\">Dropshipping<\/a> n\u00e3o \u00e9 um casino. \u00c9 um neg\u00f3cio de c\u00eantimos. Abre o Excel. Calcula os teus custos exatos. Define o teu <strong>CPA de Break-Even<\/strong>. E na pr\u00f3xima vez que vires um print de 100.000\u20ac de fatura\u00e7\u00e3o, pergunta: <em>&#8220;Sim, mas quanto \u00e9 que ficou no bolso?&#8221;<\/em><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Call to Action (CTA)<\/h3>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>*Os teus an\u00fancios est\u00e3o a &#8220;comer&#8221; todo o teu lucro? N\u00e3o sabes se o teu ROAS atual \u00e9 saud\u00e1vel ou se est\u00e1s a perder dinheiro silenciosamente? A equipa da Kair\u00f3s ADS faz uma <strong>Auditoria de Rentabilidade<\/strong>. Analisamos as tuas m\u00e9tricas e dizemos-te exatamente onde cortar e onde escalar. <strong><a href=\"https:\/\/kairosshop.pt\/ads\/\" data-type=\"link\" data-id=\"https:\/\/kairosshop.pt\/ads\/\">Clica aqui <\/a>para agendar a tua auditoria financeira de tr\u00e1fego.<\/strong>_<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>Introdu\u00e7\u00e3o: A Ilus\u00e3o do Print do Shopify Todos os dias v\u00eas no Instagram algu\u00e9m a mostrar um telem\u00f3vel com a notifica\u00e7\u00e3o: &#8220;Vendas de hoje: 1.000\u20ac&#8221;. O que ningu\u00e9m te mostra \u00e9 a outra notifica\u00e7\u00e3o: &#8220;Gastos de hoje: 1.200\u20ac&#8221;. No mundo do Dropshipping, \u00e9 muito f\u00e1cil faturar muito e perder dinheiro. Muitos empreendedores chegam \u00e0 Kair\u00f3s [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":964,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-963","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v18.3 (Yoast SEO v26.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Calculadora Lucro Dropshipping, O que \u00e9 ROAS e CPA, Margem de Lucro E-commerce, Break-Even Point, Gest\u00e3o Financeira Loja Online, KPI Marketing Digital, Kair\u00f3s ADS Performance.<\/title>\n<meta name=\"description\" content=\"N\u00e3o se deixe enganar pelos prints de fatura\u00e7\u00e3o dos &quot;gurus&quot;. Receita \u00e9 vaidade, lucro \u00e9 sanidade. Aprenda a calcular o seu Break-Even Point, a definir o CPA m\u00e1ximo no Facebook Ads e a entender porque \u00e9 que um ROAS de 2.0 pode estar a dar preju\u00edzo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kairosshop.pt\/blog\/faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Faturar 10.000\u20ac e Lucrar Zero? A Matem\u00e1tica do E-commerce que Ningu\u00e9m Te Conta (ROAS, CPA e Margem L\u00edquida)\" \/>\n<meta property=\"og:description\" content=\"N\u00e3o se deixe enganar pelos prints de fatura\u00e7\u00e3o dos &quot;gurus&quot;. Receita \u00e9 vaidade, lucro \u00e9 sanidade. Aprenda a calcular o seu Break-Even Point, a definir o CPA m\u00e1ximo no Facebook Ads e a entender porque \u00e9 que um ROAS de 2.0 pode estar a dar preju\u00edzo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kairosshop.pt\/blog\/faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida\/\" \/>\n<meta property=\"og:site_name\" content=\"Kairos Shop\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-24T01:14:42+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-24T01:14:44+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kairosshop.pt\/blog\/wp-content\/uploads\/2026\/01\/vendas-222.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"559\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Kair\u00f3s Shop\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kair\u00f3s Shop\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/kairosshop.pt\/blog\/faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/kairosshop.pt\/blog\/faturar-10-000e-e-lucrar-zero-a-matematica-do-e-commerce-que-ninguem-te-conta-roas-cpa-e-margem-liquida\/\"},\"author\":{\"name\":\"Kair\u00f3s Shop\",\"@id\":\"https:\/\/kairosshop.pt\/blog\/#\/schema\/person\/7ff3363b92169ebede978b501b751f96\"},\"headline\":\"Faturar 10.000\u20ac e Lucrar Zero? 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