Calculate the Cost of an Extension December 28, 2025December 28, 2025 by SEO Content Optimizer Checklist Target Keyword in H1 and first 100 words Meta Description contains Primary Keyword and CTA All Images have descriptive Alt Text with keywords Internal links added to 3+ relevant existing posts Keyword Density Calculator 0){ var density = (kw / total * 100).toFixed(2); resultDiv.innerHTML = 'Density: ' + density + '%'; resultDiv.style.color = (density > 2.5) ? '#e53e3e' : '#38a169'; } else { resultDiv.innerHTML = 'Enter valid numbers'; }" style="width: 100%; background-color: #3182ce; color: white; border: none; padding: 10px; border-radius: 4px; cursor: pointer; font-weight: bold;">Calculate Density * Optimal keyword density is usually between 1-2%.