Inputs
Example data table
| Project | Area (ft²) | Coats | Coverage | Gallons | Estimated total |
|---|---|---|---|---|---|
| Small path | 350 | 1 | 130 | 2.90 | $320 |
| Driveway | 1,200 | 2 | 120 | 21.60 | $1,280 |
| Large paved area | 8,500 | 2 | 110 | 166.55 | $9,950 |
Formula used
The calculator estimates sealant quantity from area, coats, and coverage, then builds a full cost breakdown with optional services and business markups.
- Area conversion: ft² = m² × 10.7639 (when using square meters).
- Gallons needed: gallons = (area_ft² × coats ÷ coverage_ft²_per_gal) × (1 + waste% ÷ 100).
- Material cost: gallons × price_per_gallon.
- Labor cost: area_ft² × labor_rate_per_ft².
- Prep cost: area_ft² × prep_rate_per_ft².
- Add-ons: crack_cost = crack_ft × crack_rate; striping_cost = striping_ft × striping_rate; plus fixed fees.
- Overhead: direct_subtotal × overhead%.
- Profit: (direct_subtotal + overhead) × profit%.
- Tax: (direct_subtotal + overhead + profit) × tax%.
- Total: direct_subtotal + overhead + profit + tax.
How to use this calculator
- Measure the paved surface area you want to seal.
- Select the unit and enter the number of coats planned.
- Use the product’s coverage value, then set a waste factor.
- Enter your material price and per-area labor and prep rates.
- Add crack filling, striping, and any fixed fees if needed.
- Set overhead, profit, and tax percentages to match your pricing.
- Click Calculate to see totals, gallons, and breakdown.
- Use Download CSV or Download PDF to share.
Project sizing and surface measurement
Accurate area drives every estimate. Measure length and width for rectangles, then sum sections for odd shapes. For circles, use pi × radius². Converting square meters to square feet keeps pricing consistent across suppliers. Typical residential driveways sit near 800–2,500 ft², while large garden parking pads can exceed 6,000 ft².
Material quantity and coverage planning
Gallons are computed from area, coats, and product coverage. Coverage often ranges from 90–160 ft² per gallon per coat, depending on texture, dilution, and broom or spray method. Two thin coats usually outperform one heavy coat for appearance. A 5–12% waste factor helps cover overlaps, porous patches, and start‑stop losses.
Labor, prep, and add-on services
Per‑area labor and prep rates convert directly into predictable costs. Prep includes sweeping, edging, weed removal along joints, and masking borders to protect plants. Higher prep rates fit oxidized surfaces or heavy debris. Crack filling is priced by linear feet and reflects routing, cleaning, and filling time. Striping uses linear feet, so layouts remain measurable.
Overhead, profit, and tax transparency
After direct costs, overhead covers vehicles, insurance, tools, scheduling, and administration. Many small crews model 8–15% overhead, while larger operations may allocate more for equipment depreciation. Profit is applied after overhead to reflect risk, seasonality, and warranty expectations. Tax is calculated last, letting you compare taxable and non‑taxable scenarios with the same base inputs.
Interpreting results and improving accuracy
The output shows total cost, cost per unit area, and a shareable breakdown. Compare estimated gallons to container sizes to reduce leftover. If cost per ft² seems high, review coverage, waste, and labor rates before reducing margins. Save a few past jobs as benchmarks, and adjust defaults to match your local pricing. For scheduling, consider curing time and temperature limits, since slow drying can increase labor. Use the fixed fees for minimum charge jobs. If you price in square meters, the calculator converts internal totals, so your displayed cost per m² remains consistent. Across different sites.
FAQs
1) What coverage value should I enter?
Use the coverage printed on your sealer label for the selected mix. If unsure, start with 120 ft² per gallon per coat, then adjust after a small test area dries.
2) How many coats are usually needed?
One coat can refresh appearance, but two coats often improve durability and uniform color. Rough or porous surfaces may need higher material or an additional coat to reach a consistent finish.
3) Why include a waste factor?
Waste accounts for overlaps, absorption, spillage, and equipment losses. A modest 5–12% range helps prevent under-ordering, especially on textured pavement or jobs with many edges.
4) Should overhead and profit be separate?
Yes. Overhead reflects running the business; profit reflects return and risk. Separating them makes pricing clearer and lets you tune competitiveness without hiding essential operating costs.
5) How do crack fill and striping affect totals?
They add measurable line-item costs using linear feet. This keeps the base sealcoat estimate clean while allowing you to include repairs and markings only when the project needs them.
6) Can I export without recalculating?
Yes. After you calculate once, the latest result is stored for this session. Use the CSV or PDF buttons to download the same breakdown until you run a new calculation.