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Roadway Striping Retroreflective Drop-On Bead Calculator

Calculate the glass bead material needed for retroreflective drop-on application over roadway striping paint.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-27 · v1.1.0

Market
Imperial · sales tax
1640 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Retroreflective bead material needed

19.84 lb

Check your inputs

Bead application rate varies by bead gradation (Type I/II/III per AASHTO M247) and target retroreflectivity level — confirm the rate for your specific project specification rather than assuming a generic value.

Total striped line area
538.2 ft²

Running these inputs gives 9 kg as the retroreflective bead material needed. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Bead mass = striped line area × the bead application rate (kg per m² of line), a separate material from the paint itself, applied while the paint is still wet to create retroreflectivity

Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

Why are retroreflective beads calculated separately from the paint?
Drop-on glass beads are a distinct material from the striping paint. They are broadcast onto the paint while it is still wet so they partially embed and create retroreflectivity, so their quantity is based on the striped line area and a separate application rate, not the paint volume.
What determines the bead application rate?
The application rate depends on the bead gradation (Type I, II, or III per AASHTO M247) and the retroreflectivity level required by the project specification. Always confirm the specified rate rather than assuming a generic value.
How is the striped line area determined?
Line area is the total line length multiplied by the painted line width — the same area the paint itself covers, since the beads are applied directly over the wet paint film.