https://publishing.co.uk/tags/spine-width/Recent content in Spine Width on publishing.co.uk — Professional KDP Book FormattingHugoen-gbSat, 21 Mar 2026 00:00:00 +0000https://publishing.co.uk/guides/spine-width-calculator/Sat, 21 Mar 2026 00:00:00 +0000https://publishing.co.uk/guides/spine-width-calculator/<style> .tool-container{max-width:800px;margin:0 auto 2rem} .tool-card-calc{background:var(--white);border:1px solid var(--border);border-radius:var(--radius);padding:2rem;margin:1.5rem 0;box-shadow:var(--shadow)} .tool-input-group{margin-bottom:1.25rem} .tool-input-group label{display:block;font-weight:600;margin-bottom:.5rem;font-size:.95rem} .tool-input-group input,.tool-input-group select{width:100%;padding:.75rem 1rem;border:1px solid var(--border);border-radius:var(--radius-sm);font-family:var(--font);font-size:1rem;background:var(--white);transition:border-color var(--transition)} .tool-input-group input:focus,.tool-input-group select:focus{outline:none;border-color:var(--indigo);box-shadow:0 0 0 3px rgba(107,33,168,.1)} .tool-btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border-radius:9999px;font-weight:600;font-size:.95rem;cursor:pointer;border:none;background:var(--indigo);color:var(--white);transition:all var(--transition);width:100%;justify-content:center} .tool-btn:hover{background:#5b1a91;transform:translateY(-1px);box-shadow:0 4px 12px rgba(107,33,168,.35)} .results-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-top:1.5rem} .result-box{background:linear-gradient(135deg,#faf5ff,#f3e8ff);border:1px solid #e9d5ff;border-radius:var(--radius-sm);padding:1.25rem;text-align:center} .result-box .label{font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:.35rem} .result-box .value{font-size:1.75rem;font-weight:700;color:var(--indigo)} .result-box .sub{font-size:.82rem;color:var(--muted);margin-top:.25rem} .spine-visual{margin:2rem 0;padding:2rem;background:#f8f5f0;border-radius:var(--radius);text-align:center} .spine-diagram{display:flex;align-items:stretch;justify-content:center;height:200px;margin:1rem auto;max-width:500px} .spine-diagram .cover{background:var(--navy);color:var(--white);display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;padding:.5rem;min-width:80px;writing-mode:vertical-rl;text-orientation:mixed} .spine-diagram .cover-front{border-radius:var(--radius-sm) 0 0 var(--radius-sm)} .spine-diagram .cover-back{border-radius:0 var(--radius-sm) var(--radius-sm) 0} .spine-diagram .spine{background:var(--indigo);color:var(--white);display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;transition:width .5s ease;min-width:4px;writing-mode:vertical-rl;text-orientation:mixed;overflow:hidden} .tip-box{background:linear-gradient(135deg,#f0fdf4,#dcfce7);border:1px solid #bbf7d0;border-radius:var(--radius-sm);padding:1.25rem;margin:1.5rem 0} .tip-box strong{color:var(--emerald)} .warn-box{background:linear-gradient(135deg,#fffbeb,#fef3c7);border:1px solid #fde68a;border-radius:var(--radius-sm);padding:1.25rem;margin:1.5rem 0} .warn-box strong{color:#92400e} .cta-box{background:linear-gradient(135deg,var(--indigo),#5b1a91);color:var(--white);border-radius:var(--radius);padding:2rem;text-align:center;margin:2.5rem 0} .cta-box h3{color:var(--white);margin-bottom:.5rem} .cta-box p{color:rgba(255,255,255,.85);margin-bottom:1rem} .cta-box .btn{background:var(--white);color:var(--indigo);padding:.75rem 2rem;border-radius:9999px;font-weight:600;text-decoration:none;display:inline-block} .cta-box .btn:hover{transform:translateY(-2px);box-shadow:0 4px 15px rgba(0,0,0,.2)} .related-tools{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:1rem;margin:1.5rem 0} .related-tool{border:1px solid var(--border);border-radius:var(--radius-sm);padding:1.25rem;text-align:center;transition:all var(--transition)} .related-tool:hover{border-color:var(--indigo);box-shadow:var(--shadow-md);transform:translateY(-2px)} .related-tool h4{font-size:.95rem;margin-bottom:.35rem} .related-tool p{font-size:.82rem;color:var(--muted);margin:0} </style> <p>Calculate the exact spine width for your Amazon KDP paperback. The spine width determines how wide the spine area of your cover needs to be, and it varies based on your page count and paper type.</p>