Modernization cost calculator.

The calculator estimates engineering hours, then converts to dollars at the blended rate you set in the form. The default rate is $65/hour, OST's typical blended rate across senior leads, mid-level engineers, and delivery support. Override it to compare against your assumed rate or another vendor's rate.

The base figure starts at 600 hours for a small site on a recent platform with no integrations and no compliance work. Every input adjusts that figure.

• Platform multiplier reflects how much migration tooling exists for the source stack. Drupal 8/9 to current Drupal 10 is well-trodden (0.9×). Classic ASP to anything modern is a rebuild, not a migration (2.0×).
• Complexity multiplier covers custom modules, workflows, and commerce logic. We do not count pages because pages are cheap. Custom logic is what eats the budget. Small = 1×, Medium = 2×, Large = 4×, Enterprise = 7×.
• Integration count adds roughly 80 hours per third-party system, scaled by site complexity. CRM, payment processor, ERP, SSO, third-party APIs all count.
• Content migration adds 0% to 20% depending on volume and relational complexity (taxonomies, authors, media, revisions, multilingual content).
• Compliance overhead stacks on the subtotal. WCAG 2.2 AA + Section 508 adds 15%. HIPAA adds 20%. FERPA adds 10%. SOC 2 alignment adds 12%. PCI DSS adds 8%.

The output is a range (low: −15%, high: +20% around midpoint), not a point estimate. The low end assumes everything goes well. The high end assumes typical surprises.

What is not included: hosting and infrastructure costs, third-party software licensing, content creation, training and change management, ongoing support and retainer. Most of these add 10% to 30% to the engineering number.