Materials calculator
Coating Material Coverage Calculator
Size a liquid coating order from the run's total sprayed area and the supplier's coverage rate. Enter area, coverage, waste and price per gallon.
What this calculator does
- Gallons to buy for a run and their cost, with waste applied to the purchase instead of hidden in the coverage rate.
Formula used
- Material required = total sprayed area ÷ supplier coverage × (1 + waste)
- Material cost = material required × cost per gallon
- Usable coverage after waste = supplier coverage ÷ (1 + waste)
- Gallons per 1,000 ft² = 1,000 ÷ supplier coverage × (1 + waste)
Inputs explained
- Total Sprayed Area for the Run: Every square foot the guns cover across all parts and coats.
- Supplier Coverage Rate: Practical spreading rate from the data sheet at your film build.
- Spray, Mix and Purge Waste: Purchased material that never becomes film: overspray, purge, pot life.
- Coating Cost: Delivered price per mixed gallon, catalyst and reducer included.
How to use the result
- Best suited to ordering coating for a defined production run, quoting material per 1,000 square feet, pricing a waste-reduction project.
- The page buys material; it does not check film build against spec. One flat waste share cannot separate mixing loss from overspray. Container rounding is yours: 12.8 gallons is three pails, remainder unpriced.
Current U.S. benchmarks
- Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
- The producer price index for industrial chemicals stands at 336.006 (BLS, Aug 2026), up 13.3% from a year earlier. Quotes priced off last quarter's material cost miss this move.
- The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).
Common questions
- How many gallons of coating do I need? Divide total sprayed area by the supplier's practical coverage, then multiply by one plus waste. A 4,800 ft² run at 420 ft²/gal and 12% waste needs 12.8 gallons, about $870 at $68 a gallon.
- What does coverage rate mean on a data sheet? The area one gallon covers at a stated dry film thickness. Theoretical coverage at 1 mil and 100% solids is 1,604 ft²/gal; practical rates like 420 already reflect solids and build, but not your transfer efficiency.
- How do I count coats in the area figure? Per coat. A part with 3.2 ft² of surface getting two full coats contributes 6.4 ft². Skipping this is the classic way orders run half short: the arithmetic was right and the area was wrong.
- What waste percentage is normal for liquid coating? Batch and manual liquid work commonly loses 10 to 20% to mixing, purge, pot-life expiry and cleanup, on top of overspray already inside a practical coverage figure. Measure yours from purchase records rather than adopting a default.
Related guides
Last reviewed 2026-10-01.