How do I know if my concrete crack is serious?

Cracks rated severity 1–2 are cosmetic and can be addressed with DIY crack filler. Cracks rated 3 need a professional assessment. Cracks rated 4–5 may indicate structural problems and require a contractor or structural engineer. Our analyzer gives you a severity score with every diagnosis.

What type of crack is in my concrete?

The six most common types are: shrinkage cracking (fine, map-pattern, cosmetic), structural cracking (wide, displaced edges), freeze-thaw spalling (surface flaking near edges), settlement cracking (one section lower than adjacent), alkali-silica reaction (web cracking with white gel residue), and corrosion-induced cracking (rust staining along crack lines). Upload a photo and our AI will classify it for you.

Is this crack analyzer accurate?

The analyzer uses Claude, a state-of-the-art AI vision model, trained to identify structural and cosmetic patterns in concrete. When the photo is ambiguous between two classifications, we always default to the higher severity — it is better to be over-cautious than to provide false reassurance. User feedback on diagnosis accuracy consistently rates above 70%.

Do I need a structural engineer for my concrete crack?

You need a structural engineer for cracks with visible displacement between edges (one side higher than the other), cracks wider than 1/4 inch, rust-brown staining along crack lines (indicating rebar corrosion), or any crack in a load-bearing structural element like a foundation wall, beam, or column.

How do I repair a concrete crack myself?

For severity 1–2 cosmetic cracks, use a polyurethane or epoxy crack filler for narrow cracks, or a concrete patching compound for wider surface damage. Clean the crack of debris, apply filler per the product instructions, allow to cure, then seal the surface. For anything rated severity 3 or higher, get a professional assessment before attempting repairs.

What causes concrete to crack?

Concrete cracks for several reasons: normal shrinkage as it cures (shrinkage cracking), freeze-thaw cycles that expand moisture within the concrete (spalling), soil movement beneath the slab (settlement), overload or impact (structural cracking), a chemical reaction between aggregate and cement paste (alkali-silica reaction), or corrosion of embedded steel reinforcement (corrosion-induced cracking).

Concrete Crack
AnalyzerFREE

Photo in, diagnosis out — failure mode, severity, and what to do next.

Tap to upload or take a photo

Click to upload · drag & drop

JPEG · PNG · WebP · Max 10 MB

How it works

Take a photo

Close-up, good lighting, crack in frame.

AI diagnoses

Classifies failure mode in seconds.

Get your result

Severity score and repair guidance.

How It Works

Upload a photo

Take a clear, close-up photo of the damaged area in good lighting. The more detail visible, the more accurate the diagnosis.

AI analyzes the damage

Our AI examines crack width, pattern, displacement, staining, and surface texture against six known concrete failure modes.

Get your diagnosis

Receive a failure mode classification, severity score from 1–5, plain-language explanation, and a clear repair recommendation.

Types of Concrete Cracks

Shrinkage Cracking

Fine, shallow cracks in a map pattern or running parallel. Uniform width under 1/16 inch with no displacement between edges. The most common type — typically cosmetic. Read more →

Structural Cracking

Wide cracks (over 1/4 inch) running vertically or diagonally, often with one side visibly higher or lower than the other. Indicates overload or structural failure. Read more →

Freeze-Thaw Spalling

Surface flaking, pitting, or the top layer lifting away in scales. Most visible near slab edges. Caused by moisture freezing and expanding within the concrete. Read more →

Settlement Cracking

One section of slab sits noticeably lower than the adjacent section. Crack runs along a joint line or diagonally from a corner. Caused by soil movement or voids beneath the slab. Read more →

Alkali-Silica Reaction (ASR)

A web of cracks covering the entire surface, often with white gel residue visible at crack edges. Progressive damage — no DIY fix exists. Read more →

Corrosion-Induced Cracking

Linear cracks running parallel to the surface, with rust-brown staining along the crack line. Indicates corrosion of embedded steel reinforcement. Read more →

Accuracy & Limitations

This tool uses AI vision analysis to classify concrete damage from photos. Diagnosis accuracy depends on photo quality — clear, well-lit, close-up shots produce the most reliable results. When the image is ambiguous between two classifications, we default to the higher severity. This tool is designed to guide decisions, not replace a professional assessment. For any crack rated severity 4 or higher, consult a licensed structural engineer before taking action.

Concrete CrackAnalyzerFREE