Formula & constants
Sealcoat protects the asphalt binder from UV and water but adds no structural strength — it pays when the base is sound and wastes money once the base has failed. Maintained asphalt reaches 20-plus years against 10–12 neglected. Alligator cracking signals base failure, which no surface treatment can reverse. All default values are editable — when your supplier's data sheet or local code says otherwise, use that number.
Where this fits in your project
This tool is one step in a bigger job. Once you have these numbers, sealcoating estimate tool (Sealcoating Calculator), then crack filler estimate tool (Crack Filler Calculator). For the full sequence see the project workflows, compare approaches on the comparison pages, and check local factors in the state guides.
Frequently asked questions
When is sealcoating no longer worth it?
Once alligator or fatigue cracking appears. That pattern means the base is failing structurally, and a surface film cannot restore load-carrying capacity — overlay or reconstruction is the only durable answer.
How much does sealcoating extend pavement life?
Consistent sealcoating every two to three years, combined with prompt crack sealing, roughly doubles service life compared with a neglected lot — from about 10–12 years to 20 or more.
What does sealcoating cost commercially?
Roughly $0.15 to $0.25 per square foot professionally applied in 2026, against $4 to $8 per square foot for full replacement. The ratio is why deferring maintenance is rarely rational.
Should I replace a driveway that is only cracked at the surface?
Usually no. Surface cracking with a sound base is exactly the case where crack sealing and sealcoating deliver their best return.
How do I judge whether my base is sound?
Look for the failure pattern. Isolated transverse or longitudinal cracks generally mean a surface-level problem; interconnected alligator cracking, rutting or pumping under load means the base needs attention.
Last verified: — See our methodology.
Planning estimates only — confirm quantities with suppliers and local code before ordering.