{"id":2923,"date":"2026-04-18T00:13:17","date_gmt":"2026-04-17T22:13:17","guid":{"rendered":"https:\/\/science-x.net\/?page_id=2923"},"modified":"2026-04-18T00:13:18","modified_gmt":"2026-04-17T22:13:18","slug":"screen-ppi-calculator","status":"publish","type":"page","link":"https:\/\/science-x.net\/?page_id=2923","title":{"rendered":"Screen PPI Calculator"},"content":{"rendered":"\n<div class=\"eco-tool wp-block-group\" id=\"eco-tool-ppi-7a6c4\">\n  <div class=\"eco-tool__header\">\n    <h2 class=\"eco-tool__title\">Screen PPI Calculator<\/h2>\n    <p class=\"eco-tool__lead\">\n      Estimate pixel density (PPI) based on screen size and resolution.\n    <\/p>\n  <\/div>\n\n  <form class=\"eco-tool__form\" id=\"eco-ppi-form-7a6c4\" novalidate>\n    <div class=\"eco-tool__grid3\">\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-ppi-width-7a6c4\">Resolution width<br>(pixels)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-ppi-width-7a6c4\" type=\"number\" min=\"1\" step=\"1\" value=\"1920\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Example: 1920 for Full HD displays.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-ppi-height-7a6c4\">Resolution height<br>(pixels)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-ppi-height-7a6c4\" type=\"number\" min=\"1\" step=\"1\" value=\"1080\" inputmode=\"numeric\" \/>\n        <div class=\"eco-tool__hint\">Example: 1080 for Full HD displays.<\/div>\n      <\/div>\n\n      <div class=\"eco-tool__field\">\n        <label class=\"eco-tool__label\" for=\"eco-ppi-size-7a6c4\">Screen size<br>(inches)<\/label>\n        <input class=\"eco-tool__input\" id=\"eco-ppi-size-7a6c4\" type=\"number\" min=\"0.1\" step=\"0.1\" value=\"24\" inputmode=\"decimal\" \/>\n        <div class=\"eco-tool__hint\">Measured diagonally, corner to corner.<\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__actions\">\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn\" id=\"eco-ppi-calc-7a6c4\">Calculate<\/button>\n      <button type=\"button\" class=\"wp-element-button eco-tool__btn eco-tool__btn--ghost\" id=\"eco-ppi-reset-7a6c4\">Reset<\/button>\n      <div class=\"eco-tool__error\" id=\"eco-ppi-error-7a6c4\" aria-live=\"polite\"><\/div>\n    <\/div>\n  <\/form>\n\n  <div class=\"eco-tool__result\" id=\"eco-ppi-result-7a6c4\" hidden>\n    <h3 class=\"eco-tool__subtitle\">Result<\/h3>\n\n    <div class=\"eco-tool__cards\">\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Pixel density<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-ppi-value-7a6c4\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-ppi-level-7a6c4\"><\/div>\n      <\/div>\n\n      <div class=\"eco-tool__card\">\n        <div class=\"eco-tool__metric-label\">Diagonal resolution<\/div>\n        <div class=\"eco-tool__metric-value\" id=\"eco-ppi-diagonal-7a6c4\">\u2014<\/div>\n        <div class=\"eco-tool__metric-sub\" id=\"eco-ppi-sub-7a6c4\"><\/div>\n      <\/div>\n    <\/div>\n\n    <div class=\"eco-tool__card eco-tool__card--wide\">\n      <div class=\"eco-tool__metric-label\">How this screen compares<\/div>\n      <div class=\"eco-tool__bars\" id=\"eco-ppi-bars-7a6c4\"><\/div>\n      <div class=\"eco-tool__metric-sub eco-tool__muted\" id=\"eco-ppi-tip-7a6c4\"><\/div>\n    <\/div>\n\n    <p class=\"eco-tool__note\">\n      PPI is only one part of display quality. Brightness, contrast, color accuracy, and viewing distance also matter.\n    <\/p>\n  <\/div>\n\n  <details class=\"eco-tool__details\">\n    <summary class=\"eco-tool__summary\">How we calculate<\/summary>\n    <div class=\"eco-tool__details-body\">\n      <p class=\"eco-tool__text\">\n        We first calculate the diagonal resolution using the Pythagorean theorem, then divide it by the screen size in inches:\n        PPI = \u221a(width\u00b2 + height\u00b2) \u00f7 size.\n      <\/p>\n      <ul class=\"eco-tool__list\" id=\"eco-ppi-factors-7a6c4\"><\/ul>\n    <\/div>\n  <\/details>\n<\/div>\n\n<style>\n.eco-tool{\n  border: 1px solid rgba(0,0,0,.12);\n  border-radius: 12px;\n  padding: 16px;\n}\n.eco-tool__header{ margin-bottom: 12px; }\n.eco-tool__title{ margin: 0 0 8px; }\n.eco-tool__lead{ margin: 0; opacity: .9; }\n.eco-tool__form{ margin-top: 12px; }\n\n.eco-tool__grid3{\n  display: grid;\n  grid-template-columns: 1fr;\n  gap: 16px;\n}\n@media (min-width: 860px){\n  .eco-tool__grid3{ grid-template-columns: 1fr 1fr 1fr; }\n}\n\n.eco-tool__field{\n  display: flex;\n  flex-direction: column;\n  gap: 6px;\n}\n.eco-tool__label{\n  font-weight: 600;\n}\n.eco-tool__input{\n  width: 100%;\n  height: 44px;\n  padding: 0 12px;\n  border: 1px solid rgba(0,0,0,.20);\n  border-radius: 10px;\n  background: #fff;\n  box-sizing: border-box;\n  font: inherit;\n}\n.eco-tool select.eco-tool__input{\n  appearance: none;\n  -webkit-appearance: none;\n  line-height: 44px;\n  padding-right: 40px;\n  background-image:\n    linear-gradient(45deg, transparent 50%, rgba(0,0,0,.60) 50%),\n    linear-gradient(135deg, rgba(0,0,0,.60) 50%, transparent 50%);\n  background-position:\n    calc(100% - 18px) 50%,\n    calc(100% - 12px) 50%;\n  background-size: 6px 6px;\n  background-repeat: no-repeat;\n}\n.eco-tool__hint{\n  font-size: .92em;\n  opacity: .78;\n  min-height: 38px;\n}\n.eco-tool__actions{\n  display: flex;\n  flex-wrap: wrap;\n  gap: 10px;\n  align-items: center;\n  margin-top: 16px;\n}\n.eco-tool__btn{\n  padding: 10px 22px;\n}\n.eco-tool__btn--ghost{\n  background: transparent !important;\n  border: 1px solid rgba(0,0,0,.20) !important;\n}\n.eco-tool__btn--ghost:hover,\n.eco-tool__btn--ghost:focus{\n  background: rgba(0,0,0,.06) !important;\n  border-color: rgba(0,0,0,.35) !important;\n}\n.eco-tool__error{\n  min-height: 1.2em;\n  font-weight: 600;\n  flex: 1 1 240px;\n}\n.eco-tool__result{ margin-top: 16px; }\n.eco-tool__subtitle{ margin: 0 0 10px; }\n.eco-tool__cards{\n  display: grid;\n  gap: 10px;\n  grid-template-columns: 1fr;\n}\n@media (min-width: 860px){\n  .eco-tool__cards{ grid-template-columns: 1fr 1fr; }\n}\n.eco-tool__card{\n  border: 1px solid rgba(0,0,0,.12);\n  border-radius: 12px;\n  padding: 12px;\n}\n.eco-tool__card--wide{\n  margin-top: 10px;\n}\n.eco-tool__metric-label{ opacity: .85; font-weight: 600; }\n.eco-tool__metric-value{ font-size: 1.6em; font-weight: 800; margin-top: 6px; line-height: 1.1; }\n.eco-tool__metric-sub{ opacity: .85; margin-top: 6px; }\n\n.eco-tool__bars{\n  display: grid;\n  gap: 10px;\n  margin-top: 12px;\n}\n.eco-tool__barrow{\n  display: grid;\n  grid-template-columns: 140px 1fr 90px;\n  gap: 10px;\n  align-items: center;\n}\n@media (max-width: 480px){\n  .eco-tool__barrow{ grid-template-columns: 110px 1fr 70px; }\n}\n.eco-tool__barlabel{ font-weight: 600; opacity: .9; }\n.eco-tool__bartrack{\n  border: 1px solid rgba(0,0,0,.12);\n  border-radius: 999px;\n  height: 12px;\n  overflow: hidden;\n  background: rgba(0,0,0,.03);\n}\n.eco-tool__barfill{\n  height: 100%;\n  width: 0%;\n  background: rgba(0,0,0,.25);\n}\n.eco-tool__barval{ text-align: right; opacity: .85; white-space: nowrap; }\n\n.eco-tool__note{ margin: 10px 0 0; opacity: .9; }\n.eco-tool__muted{ opacity: .8; }\n.eco-tool__details{ margin-top: 14px; }\n.eco-tool__summary{ cursor: pointer; font-weight: 700; }\n.eco-tool__details-body{ margin-top: 10px; }\n.eco-tool__text{ margin: 0 0 10px; }\n.eco-tool__list{ margin: 0; padding-left: 18px; }\n<\/style>\n\n<script>\n(function(){\n  const S = \"7a6c4\";\n  const el = (id) => document.getElementById(id + \"-\" + S);\n\n  const widthEl = el(\"eco-ppi-width\");\n  const heightEl = el(\"eco-ppi-height\");\n  const sizeEl = el(\"eco-ppi-size\");\n\n  const calcBtn = el(\"eco-ppi-calc\");\n  const resetBtn = el(\"eco-ppi-reset\");\n  const errorEl = el(\"eco-ppi-error\");\n  const resultEl = el(\"eco-ppi-result\");\n\n  const valueEl = el(\"eco-ppi-value\");\n  const levelEl = el(\"eco-ppi-level\");\n  const diagonalEl = el(\"eco-ppi-diagonal\");\n  const subEl = el(\"eco-ppi-sub\");\n  const barsEl = el(\"eco-ppi-bars\");\n  const tipEl = el(\"eco-ppi-tip\");\n  const factorsEl = el(\"eco-ppi-factors\");\n\n  function setError(msg){ errorEl.textContent = msg || \"\"; }\n  function fmt(x){ return (Math.round(x * 10) \/ 10).toLocaleString(undefined, { maximumFractionDigits: 1 }); }\n\n  function fillFactors(){\n    factorsEl.innerHTML = [\n      `<li><strong>Diagonal pixels:<\/strong> \u221a(width\u00b2 + height\u00b2)<\/li>`,\n      `<li><strong>PPI formula:<\/strong> diagonal pixels \u00f7 screen size in inches<\/li>`,\n      `<li><strong>Lower PPI:<\/strong> larger pixels and softer text<\/li>`,\n      `<li><strong>Higher PPI:<\/strong> sharper text and finer detail<\/li>`\n    ].join(\"\");\n  }\n\n  function barRow(label, pct, value){\n    const p = Math.max(0, Math.min(100, pct));\n    return `\n      <div class=\"eco-tool__barrow\">\n        <div class=\"eco-tool__barlabel\">${label}<\/div>\n        <div class=\"eco-tool__bartrack\"><div class=\"eco-tool__barfill\" style=\"width:${p}%;\"><\/div><\/div>\n        <div class=\"eco-tool__barval\">${value}<\/div>\n      <\/div>\n    `;\n  }\n\n  function calculate(){\n    setError(\"\");\n\n    const width = Number(widthEl.value);\n    const height = Number(heightEl.value);\n    const size = Number(sizeEl.value);\n\n    if (!Number.isFinite(width) || width <= 0){\n      setError(\"Please enter a valid resolution width.\");\n      resultEl.hidden = true;\n      return;\n    }\n    if (!Number.isFinite(height) || height <= 0){\n      setError(\"Please enter a valid resolution height.\");\n      resultEl.hidden = true;\n      return;\n    }\n    if (!Number.isFinite(size) || size <= 0){\n      setError(\"Please enter a valid screen size.\");\n      resultEl.hidden = true;\n      return;\n    }\n\n    const diagonalPixels = Math.sqrt((width * width) + (height * height));\n    const ppi = diagonalPixels \/ size;\n\n    let level = \"Standard sharpness\";\n    if (ppi < 110) level = \"Low pixel density\";\n    else if (ppi < 180) level = \"Good everyday sharpness\";\n    else if (ppi < 260) level = \"High sharpness\";\n    else level = \"Very high pixel density\";\n\n    valueEl.textContent = `${fmt(ppi)} PPI`;\n    levelEl.textContent = level;\n\n    diagonalEl.textContent = `${fmt(diagonalPixels)} px`;\n    subEl.textContent = `Diagonal resolution across the screen`;\n\n    const referencePhone = 460;\n    const referenceLaptop = 220;\n    const referenceMonitor = 110;\n\n    const max = Math.max(referencePhone, referenceLaptop, referenceMonitor, ppi);\n    barsEl.innerHTML =\n      barRow(\"This screen\", (ppi \/ max) * 100, `${fmt(ppi)} PPI`) +\n      barRow(\"Monitor\", (referenceMonitor \/ max) * 100, `${referenceMonitor} PPI`) +\n      barRow(\"Laptop\", (referenceLaptop \/ max) * 100, `${referenceLaptop} PPI`) +\n      barRow(\"Phone\", (referencePhone \/ max) * 100, `${referencePhone} PPI`);\n\n    tipEl.textContent =\n      ppi < 110\n        ? \"Tip: Text may look softer at close viewing distances.\"\n        : ppi < 180\n        ? \"Tip: This is usually comfortable for monitors and larger screens.\"\n        : ppi < 260\n        ? \"Tip: This is quite sharp for laptops and tablets.\"\n        : \"Tip: This is in phone-class territory for crisp text and images.\";\n\n    resultEl.hidden = false;\n  }\n\n  function reset(){\n    setError(\"\");\n    widthEl.value = \"1920\";\n    heightEl.value = \"1080\";\n    sizeEl.value = \"24\";\n    resultEl.hidden = true;\n  }\n\n  fillFactors();\n  calcBtn.addEventListener(\"click\", calculate);\n  resetBtn.addEventListener(\"click\", reset);\n})();\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>Screen PPI Calculator Estimate pixel density (PPI) based on screen size and resolution. Resolution width(pixels) Example: 1920 for Full HD displays. Resolution height(pixels) Example: 1080 for Full HD displays. Screen&hellip;<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":2677,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"_links":{"self":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2923"}],"collection":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2923"}],"version-history":[{"count":1,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2923\/revisions"}],"predecessor-version":[{"id":2924,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2923\/revisions\/2924"}],"up":[{"embeddable":true,"href":"https:\/\/science-x.net\/index.php?rest_route=\/wp\/v2\/pages\/2677"}],"wp:attachment":[{"href":"https:\/\/science-x.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2923"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}