{"id":386,"date":"2026-04-04T12:36:02","date_gmt":"2026-04-04T12:36:02","guid":{"rendered":"https:\/\/poznayu.com\/en\/?p=386"},"modified":"2026-04-04T12:37:05","modified_gmt":"2026-04-04T12:37:05","slug":"a3-a4-and-a5-to-pixels-calculator","status":"publish","type":"post","link":"https:\/\/poznayu.com\/en\/a3-a4-and-a5-to-pixels-calculator\/","title":{"rendered":"A3, A4, and A5 to Pixels Calculator"},"content":{"rendered":"<div style='text-align:right' class='yasr-auto-insert-visitor'><\/div><p data-start=\"202\" data-end=\"587\">An online paper format calculator helps designers, layout specialists, and print professionals quickly convert standard A3, A4, and A5 sizes into pixels. You can set your own DPI value, from 1 to 1000, and the tool will calculate the exact width and height for the selected format. That is especially useful when preparing print layouts, creating PDFs, or calculating graphic elements.<\/p>\n<p data-start=\"202\" data-end=\"587\"><!--more--><\/p>\n<p data-start=\"589\" data-end=\"894\">Just pick the format you need, enter the DPI (96 by default, which is the standard screen value), and solve a simple arithmetic expression to protect against bots. The result appears instantly. The service is mobile-friendly and works without reloading the page \u2014 all in clean PHP with a modern interface.<\/p>\n<ul>\n<li data-start=\"896\" data-end=\"931\">Demo: <a href=\"https:\/\/poznayu.com\/pixels\/index-en.php\" target=\"_blank\" rel=\"noopener\" title=\"DPI Calculator: A4, A5, A3 sizes in pixels\">A3\/A4\/A5 to Pixels Calculator<\/a><\/li>\n<\/ul>\n<hr \/>\n<p data-start=\"933\" data-end=\"965\">The tasks I set for myself were:<\/p>\n<ol>\n<li data-start=\"967\" data-end=\"1346\">Convert A3, A4, and A5 paper sizes into pixels.<\/li>\n<li data-start=\"967\" data-end=\"1346\">DPI had to be taken into account. DPI is dots per inch: the higher the value, the more pixels you get in the final size. I set 96 by default (for example, Paint.NET uses this value by default).<\/li>\n<li data-start=\"967\" data-end=\"1346\">There had to be a bot-check captcha (simple, written quickly and pragmatically).<\/li>\n<li data-start=\"967\" data-end=\"1346\">Scroll the screen down to the calculation results.<\/li>\n<\/ol>\n<p data-start=\"1348\" data-end=\"1610\">PHP was chosen because the captcha requires storing the correct answer between requests through sessions, and pure client-side JavaScript cannot do that without a server \u2014 any user could easily see the correct answer in the page source and bypass the protection.<\/p>\n<p data-start=\"1612\" data-end=\"1741\">Strictly speaking, I could have written this in any other language I know as well: Assembler, ASP.NET, C++, C#, and a few others.<\/p>\n<p data-start=\"1743\" data-end=\"1970\">For example, here is a compact piece of Linux x86-64 Assembler code that asks for the DPI, calculates the width and height of A4 in pixels, and prints the result. For simplicity, we use integer fixed-point arithmetic (scaling):<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-plain\" data-lang=\"Plain Text\"><code>; Fragment: DPI input \u2192 A4 pixel calculation \u2192 output\r\n; Compilation: nasm -f elf64 calc.asm &amp;&amp; ld calc.o -o calc\r\n\r\nsection .data\r\nmsg_dpi db \"Enter DPI (1-1000): \", 0\r\nmsg_w db \"A4 width: \", 0\r\nmsg_h db \"A4 height: \", 0\r\nnewline db 10, 0\r\nformat db \"%d\", 0\r\nout_buf db \" \", 0 ; number buffer (8 bytes)\r\n\r\nsection .bss\r\ndpi resd 1\r\nwidth resd 1\r\nheight resd 1\r\n\r\nsection .text\r\nextern printf, scanf ; using standard C functions (for convenience)\r\nglobal main\r\n\r\nmain:\r\n; --- DPI input ---\r\npush rbp\r\nmov rbp, rsp\r\nsub rsp, 16\r\n\r\nmov rdi, msg_dpi\r\ncall printf\r\nmov rdi, format\r\nmov rsi, dpi\r\ncall scanf\r\n\r\n; --- A4 width calculation = (210 \/ 25.4) * DPI ---\r\n; Using fixed point: 210 \/ 25.4 = 2100 \/ 254 = 8.2677...\r\n; Multiply DPI * 2100, then divide by 254.\r\nmov eax, [dpi]\r\nimul eax, 2100 ; DPI * 2100\r\nxor edx, edx\r\nmov ecx, 254\r\ndiv ecx ; eax = width in pixels\r\nmov [width], eax\r\n\r\n; --- A4 height calculation = (297 \/ 25.4) * DPI ---\r\nmov eax, [dpi]\r\nimul eax, 2970 ; 297 * 10 = 2970\r\nmov ecx, 254\r\nxor edx, edx\r\ndiv ecx\r\nmov [height], eax\r\n\r\n; --- output width ---\r\nmov rdi, msg_w\r\ncall printf\r\nmov eax, [width]\r\nmov rsi, out_buf\r\ncall int_to_str ; convert number to string (not shown, but assumed)\r\nmov rdi, out_buf\r\ncall printf\r\nmov rdi, newline\r\ncall printf\r\n\r\n; --- output height ---\r\nmov rdi, msg_h\r\ncall printf\r\nmov eax, [height]\r\n... same idea ...\r\n\r\nleave\r\nret\r\n\r\n; (the int_to_str function is omitted for brevity, but it is easy to add)<\/code><\/pre>\n<\/div>\n<h2 data-start=\"3452\" data-end=\"3463\">Source code<\/h2>\n<p data-start=\"3465\" data-end=\"3685\" data-is-last-node=\"\" data-is-only-node=\"\">Here is the source for our PHP \/ HTML5 \/ CSS3 calculator. There is no need to worry about icons. It is 2026 now, and all browsers handle standard Unicode icons just fine, so converting them to HEX codes is not necessary:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"prism line-numbers lang-php\" data-lang=\"PHP\"><code>&lt;?php\r\nsession_start();\r\n\/\/ Generate CAPTCHA\r\nfunction generate_captcha() {\r\n$num1 = rand(1, 9);\r\n$num2 = rand(1, 9);\r\n$op = rand(0, 1) ? '+' : '-';\r\nif ($op == '-' &amp;&amp; $num1 &lt; $num2) {\r\nlist($num1, $num2) = [$num2, $num1];\r\n}\r\n$expression = \"$num1 $op $num2\";\r\n$result = ($op == '+') ? $num1 + $num2 : $num1 - $num2;\r\n$_SESSION['captcha'] = $result;\r\nreturn $expression;\r\n}\r\n\/\/ Get POST parameters\r\n$format = $_POST['format'] ?? 'A4';\r\n$dpi = isset($_POST['dpi']) ? (int)$_POST['dpi'] : 96;\r\n$captcha_input = $_POST['captcha_input'] ?? '';\r\n$captcha_ok = false;\r\n$result = null;\r\n$error = '';\r\n$should_scroll = false;\r\n\/\/ Validate CAPTCHA on submit\r\nif ($_SERVER['REQUEST_METHOD'] === 'POST') {\r\nif (isset($_POST['calculate'])) {\r\nif ((int)$captcha_input === ($_SESSION['captcha'] ?? 0)) {\r\n$captcha_ok = true;\r\n$should_scroll = true;\r\nif ($dpi &lt; 1) $dpi = 1;\r\nif ($dpi &gt; 1000) $dpi = 1000;\r\n$sizes = [\r\n'A3' =&gt; ['width' =&gt; 297, 'height' =&gt; 420],\r\n'A4' =&gt; ['width' =&gt; 210, 'height' =&gt; 297],\r\n'A5' =&gt; ['width' =&gt; 148, 'height' =&gt; 210],\r\n];\r\n$size = $sizes[$format] ?? $sizes['A4'];\r\n$width_px = round(($size['width'] \/ 25.4) * $dpi);\r\n$height_px = round(($size['height'] \/ 25.4) * $dpi);\r\n$result = ['width' =&gt; $width_px, 'height' =&gt; $height_px, 'dpi' =&gt; $dpi, 'format' =&gt; $format];\r\n} else {\r\n$error = 'Incorrect CAPTCHA answer. Please try again.';\r\n}\r\n}\r\n$captcha_expr = generate_captcha();\r\n} else {\r\n$captcha_expr = generate_captcha();\r\n}\r\n?&gt;\r\n&lt;!DOCTYPE html&gt;\r\n&lt;html lang=\"en\"&gt;\r\n&lt;head&gt;\r\n&lt;meta charset=\"UTF-8\"&gt;\r\n&lt;meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0, viewport-fit=cover\"&gt;\r\n&lt;title&gt;DPI Calculator: A4, A5, A3 sizes in pixels&lt;\/title&gt;\r\n&lt;meta name=\"description\" content=\"Convert A4, A5, A3 paper sizes to pixels based on DPI. Simple online calculator with CAPTCHA, perfect for designers and print professionals.\"&gt;\r\n&lt;style&gt;\r\n* {\r\nmargin: 0;\r\npadding: 0;\r\nbox-sizing: border-box;\r\n}\r\nbody {\r\nfont-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;\r\nbackground: linear-gradient(145deg, #f0f4fa 0%, #e2e8f0 100%);\r\nmin-height: 100vh;\r\npadding: 2rem 1rem;\r\ndisplay: flex;\r\njustify-content: center;\r\nalign-items: center;\r\n}\r\n.card {\r\nmax-width: 650px;\r\nwidth: 100%;\r\nbackground: rgba(255,255,255,0.96);\r\nbackdrop-filter: blur(2px);\r\nborder-radius: 2rem;\r\nbox-shadow: 0 25px 45px rgba(0,0,0,0.1), 0 0 0 1px rgba(255,255,255,0.5);\r\noverflow: hidden;\r\ntransition: transform 0.2s;\r\n}\r\n.card:hover {\r\ntransform: scale(1.01);\r\n}\r\n.header {\r\nbackground: #1e2a3a;\r\npadding: 1.5rem 2rem;\r\ncolor: white;\r\n}\r\n.header h1 {\r\nfont-weight: 600;\r\nfont-size: 1.8rem;\r\nletter-spacing: -0.3px;\r\n}\r\n.header p {\r\nopacity: 0.8;\r\nmargin-top: 0.5rem;\r\nfont-size: 0.95rem;\r\n}\r\n.content {\r\npadding: 2rem;\r\n}\r\n.seo-text {\r\nbackground: #f8fafc;\r\npadding: 1.2rem;\r\nborder-radius: 1.2rem;\r\nmargin-bottom: 2rem;\r\nborder-left: 5px solid #2c7da0;\r\nfont-size: 0.95rem;\r\nline-height: 1.5;\r\ncolor: #1e2a3a;\r\n}\r\n.seo-text p {\r\nmargin-bottom: 0.8rem;\r\n}\r\n.seo-text p:last-child {\r\nmargin-bottom: 0;\r\n}\r\n.form-group {\r\nmargin-bottom: 1.5rem;\r\n}\r\nlabel {\r\nfont-weight: 600;\r\ndisplay: block;\r\nmargin-bottom: 0.6rem;\r\ncolor: #0f172a;\r\n}\r\n.radio-group {\r\ndisplay: flex;\r\nflex-wrap: wrap;\r\ngap: 1.5rem;\r\nbackground: #f1f5f9;\r\npadding: 1rem;\r\nborder-radius: 1.2rem;\r\n}\r\n.radio-group label {\r\ndisplay: inline-flex;\r\nalign-items: center;\r\ngap: 0.5rem;\r\nfont-weight: normal;\r\ncursor: pointer;\r\n}\r\ninput[type=\"number\"] {\r\nwidth: 100%;\r\npadding: 0.8rem 1rem;\r\nborder: 2px solid #cbd5e1;\r\nborder-radius: 1.5rem;\r\nfont-size: 1rem;\r\ntransition: all 0.2s;\r\nbackground: white;\r\n}\r\ninput[type=\"number\"]:focus {\r\nborder-color: #2c7da0;\r\noutline: none;\r\nbox-shadow: 0 0 0 3px rgba(44,125,160,0.2);\r\n}\r\n.captcha-box {\r\nbackground: #eef2ff;\r\nborder-radius: 1.5rem;\r\npadding: 1rem 1.5rem;\r\ndisplay: flex;\r\nalign-items: center;\r\nflex-wrap: wrap;\r\ngap: 1rem;\r\nmargin-bottom: 1.8rem;\r\n}\r\n.captcha-expression {\r\nfont-size: 2rem;\r\nfont-weight: 700;\r\nfont-family: monospace;\r\nbackground: white;\r\npadding: 0.3rem 1.2rem;\r\nborder-radius: 3rem;\r\nborder: 2px solid #2c7da0;\r\n}\r\n.captcha-input {\r\nflex: 1;\r\nmin-width: 100px;\r\npadding: 0.7rem;\r\nfont-size: 1.2rem;\r\ntext-align: center;\r\nborder: 2px solid #cbd5e1;\r\nborder-radius: 2rem;\r\n}\r\nbutton {\r\nbackground: #2c7da0;\r\ncolor: white;\r\nborder: none;\r\nwidth: 100%;\r\npadding: 1rem;\r\nfont-size: 1.2rem;\r\nfont-weight: 600;\r\nborder-radius: 3rem;\r\ncursor: pointer;\r\ntransition: all 0.2s;\r\nbox-shadow: 0 4px 6px rgba(0,0,0,0.1);\r\n}\r\nbutton:hover {\r\nbackground: #1f5e7a;\r\ntransform: translateY(-2px);\r\n}\r\n.result {\r\nmargin-top: 2rem;\r\nbackground: #e6f7f0;\r\npadding: 1.2rem;\r\nborder-radius: 1.2rem;\r\nborder-left: 6px solid #2c7da0;\r\n}\r\n.result h3 {\r\nmargin-bottom: 0.8rem;\r\ncolor: #0f3b2c;\r\n}\r\n.result p {\r\nfont-size: 1.1rem;\r\nmargin: 0.4rem 0;\r\nfont-weight: 500;\r\n}\r\n.error {\r\nbackground: #fee2e2;\r\ncolor: #b91c1c;\r\npadding: 0.8rem;\r\nborder-radius: 1rem;\r\nmargin-top: 1rem;\r\ntext-align: center;\r\n}\r\nfooter {\r\ntext-align: center;\r\npadding: 1rem;\r\nfont-size: 0.8rem;\r\ncolor: #64748b;\r\nborder-top: 1px solid #e2e8f0;\r\nmargin-top: 1.5rem;\r\n}\r\n@media (max-width: 550px) {\r\n.card {\r\nborder-radius: 1.2rem;\r\n}\r\n.content {\r\npadding: 1.5rem;\r\n}\r\n.radio-group {\r\ngap: 0.8rem;\r\n}\r\n.captcha-expression {\r\nfont-size: 1.5rem;\r\npadding: 0.2rem 1rem;\r\n}\r\n}\r\n&lt;\/style&gt;\r\n&lt;\/head&gt;\r\n&lt;body&gt;\r\n&lt;div class=\"card\"&gt;\r\n&lt;div class=\"header\"&gt;\r\n&lt;h1&gt;\ud83d\udcd0 A3, A4, A5 Pixel Size Calculator (DPI based)&lt;\/h1&gt;\r\n&lt;p&gt;Convert millimeters to pixels using DPI (dots per inch)&lt;\/p&gt;\r\n&lt;\/div&gt;\r\n&lt;div class=\"content\"&gt;\r\n&lt;div class=\"seo-text\"&gt;\r\n&lt;p&gt;&lt;strong&gt;Online paper size calculator&lt;\/strong&gt; helps designers, layout artists, and print professionals quickly convert standard A3, A4, A5 sizes into pixels. Enter your desired DPI (1\u20131000), and the tool will calculate the exact width and height for the selected format. This is especially useful when preparing print layouts, creating PDFs, or calculating graphic elements.&lt;\/p&gt;\r\n&lt;p&gt;Simply select the paper size, enter DPI (default 96, standard screen resolution), and solve a simple arithmetic expression to prevent bots. The result appears instantly. The service is fully mobile\u2011friendly and works without page reloads \u2014 pure PHP with a modern interface.&lt;\/p&gt;\r\n&lt;\/div&gt;\r\n&lt;form method=\"post\" id=\"calcForm\"&gt;\r\n&lt;div class=\"form-group\"&gt;\r\n&lt;label&gt;\ud83d\udcc4 Choose paper size:&lt;\/label&gt;\r\n&lt;div class=\"radio-group\"&gt;\r\n&lt;label&gt;&lt;input type=\"radio\" name=\"format\" value=\"A3\" &lt;?= (isset($format) &amp;&amp; $format === 'A3') ? 'checked' : '' ?&gt;&gt; A3 (297\u00d7420 mm)&lt;\/label&gt;\r\n&lt;label&gt;&lt;input type=\"radio\" name=\"format\" value=\"A4\" &lt;?= (!isset($format) || $format === 'A4') ? 'checked' : '' ?&gt;&gt; A4 (210\u00d7297 mm)&lt;\/label&gt;\r\n&lt;label&gt;&lt;input type=\"radio\" name=\"format\" value=\"A5\" &lt;?= (isset($format) &amp;&amp; $format === 'A5') ? 'checked' : '' ?&gt;&gt; A5 (148\u00d7210 mm)&lt;\/label&gt;\r\n&lt;\/div&gt;\r\n&lt;\/div&gt;\r\n&lt;div class=\"form-group\"&gt;\r\n&lt;label&gt;\ud83d\udda8\ufe0f DPI (dots per inch) \u2014 from 1 to 1000:&lt;\/label&gt;\r\n&lt;input type=\"number\" name=\"dpi\" value=\"&lt;?= htmlspecialchars($dpi) ?&gt;\" step=\"1\" min=\"1\" max=\"1000\" required&gt;\r\n&lt;\/div&gt;\r\n&lt;div class=\"captcha-box\"&gt;\r\n&lt;span class=\"captcha-expression\"&gt;&lt;?= $captcha_expr ?&gt; = ?&lt;\/span&gt;\r\n&lt;input type=\"text\" name=\"captcha_input\" class=\"captcha-input\" placeholder=\"Answer\" required autocomplete=\"off\"&gt;\r\n&lt;\/div&gt;\r\n&lt;button type=\"submit\" name=\"calculate\"&gt;Calculate pixel dimensions&lt;\/button&gt;\r\n&lt;\/form&gt;\r\n&lt;?php if ($error): ?&gt;\r\n&lt;div class=\"error\"&gt;\u26a0\ufe0f &lt;?= htmlspecialchars($error) ?&gt;&lt;\/div&gt;\r\n&lt;?php endif; ?&gt;\r\n&lt;?php if ($result &amp;&amp; $captcha_ok): ?&gt;\r\n&lt;div class=\"result\" id=\"resultBlock\"&gt;\r\n&lt;h3&gt;\ud83d\udccf Result for &lt;?= htmlspecialchars($result['format']) ?&gt; (DPI = &lt;?= $result['dpi'] ?&gt;):&lt;\/h3&gt;\r\n&lt;p&gt;\ud83d\udcd0 Width: &lt;strong&gt;&lt;?= number_format($result['width'], 0, ',', ' ') ?&gt; px&lt;\/strong&gt;&lt;\/p&gt;\r\n&lt;p&gt;\ud83d\udcd0 Height: &lt;strong&gt;&lt;?= number_format($result['height'], 0, ',', ' ') ?&gt; px&lt;\/strong&gt;&lt;\/p&gt;\r\n&lt;p style=\"font-size:0.85rem; margin-top:0.8rem;\"&gt;* Formula: (mm \/ 25.4) \u00d7 DPI&lt;\/p&gt;\r\n&lt;\/div&gt;\r\n&lt;?php endif; ?&gt;\r\n&lt;footer&gt;\r\nAccuracy up to whole pixel. Based on ISO 216 international standard.\r\n&lt;\/footer&gt;\r\n&lt;\/div&gt;\r\n&lt;\/div&gt;\r\n&lt;?php if ($should_scroll &amp;&amp; $result &amp;&amp; $captcha_ok): ?&gt;\r\n&lt;script&gt;\r\n(function() {\r\nfunction scrollToResult() {\r\nvar resultBlock = document.getElementById('resultBlock');\r\nif (resultBlock) {\r\nsetTimeout(function() {\r\nresultBlock.scrollIntoView({ behavior: 'smooth', block: 'start' });\r\nvar offset = 80;\r\nvar elementPosition = resultBlock.getBoundingClientRect().top + window.pageYOffset;\r\nwindow.scrollTo({ top: elementPosition - offset, behavior: 'smooth' });\r\n}, 100);\r\n}\r\n}\r\nif (document.readyState === 'loading') {\r\ndocument.addEventListener('DOMContentLoaded', scrollToResult);\r\n} else {\r\nscrollToResult();\r\n}\r\n})();\r\n&lt;\/script&gt;\r\n&lt;?php endif; ?&gt;\r\n&lt;\/body&gt;\r\n&lt;\/html&gt;<\/code><\/pre>\n<\/div>\n<div style='text-align:right' class='yasr-auto-insert-visitor'><\/div>","protected":false},"excerpt":{"rendered":"<p>An online paper format calculator helps designers, layout specialists, and print professionals quickly convert standard A3, A4, and A5 sizes [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":387,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"yasr_overall_rating":0,"yasr_post_is_review":"","yasr_auto_insert_disabled":"","yasr_review_type":"","footnotes":""},"categories":[137],"tags":[335,338,337,336],"class_list":["post-386","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-web","tag-a4","tag-calculator","tag-dpi","tag-pixels"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>A3, A4, and A5 to Pixels Calculator<\/title>\n<meta name=\"description\" content=\"Convert A3, A4, and A5 paper sizes to pixels instantly with a custom DPI calculator built for print layouts, PDFs, and design work.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" 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