Disclaimer

Estimates only

All calculators on Calculator Street provide estimates only. Materials, densities, coverage rates, prices, labor, waste factors, and yields vary by location, supplier, product, batch, site conditions, and project specifics. Always confirm quantities, costs, and methods with your supplier and contractor before ordering or building.

Not professional advice

Nothing on this site is professional construction, engineering, architectural, or financial advice. For structural, roofing, foundation, retaining wall, load-bearing, electrical, plumbing, or code questions, consult a licensed professional. Do not rely solely on calculator outputs for safety-critical decisions.

No guarantee of accuracy

We strive for accuracy with hand-verified formulas, manufacturer yields (e.g., 80-lb concrete = 0.60 ft³), and cited densities (pea 1.35, crushed 1.40, limestone 1.60 tons/yd³ vs scale-house averages; roof multiplier √(pitch²+144)/12). However, we do not guarantee results. Field factors like compaction (TxDOT 15–25%), moisture, spillage, and irregular shapes affect real needs.

Use at your own risk

Use of calculators is at your own risk. You are responsible for verifying measurements, adding appropriate waste (we suggest 10% rectangles, 15% curves/hips — adjust per job), and complying with local building codes and permits. We are not liable for over- or under-ordering, cost overruns, rework, delays, or structural failures. See Terms for liability limits.

External links & sources

We cite public sources like TxDOT compaction guides and CPSC playground safety for context. Those sources may change; we link for reference but do not control third-party content. Verify current codes with your local authority.

Ads & affiliates

We show Google AdSense ads (see Privacy). We do not participate in affiliate programs that affect calculator results. If we add affiliate links in the future, we will disclose them clearly.

Contact

Found an error? Email hello@calculatorst.com with the calculator URL, your inputs, expected vs actual, and source. We fix verified errors promptly.