Free sealcoating calculator
Enter your surface area to see how much sealer you need. Free, no login.
Enter your surface area to see how much sealer you need.
Change coats, sealer, mix or price
Two is the usual minimum.
Coverage varies by product, so use the number on your sealer's data sheet. The concentrate line, not the mixed one.
A third coat is optional at entrances, exits and drive lanes.
Usually 15 to 25 gallons
Usually 200 to 500 lb
Usually 0.5 to 2 gallons
Your own number. 10 percent is a starting point.
From your supplier, for a material cost.
Sealing this lot? Quote it from the same numbers.
A free MakeHay account measures the lot from satellite, fills a per square foot line on the quote, and sends it for one-tap approval. The forecast shows on the calendar for the day you scheduled.
Free forever. No credit card. Set up in minutes.
How it works
How the sealcoating calculator works
- 1
Concentrate: area times coats, divided by coverage
A gallon of concentrate usually covers 100 to 120 sq ft per coat. The calculator starts at two coats and 100 sq ft per gallon, the safe end for older pavement. Smooth, recently sealed pavement can go to 120.
- 2
Water, sand and additive
These scale with your gallons of concentrate. Asphalt emulsion usually takes 15 to 25 gallons of water per 100 gallons of concentrate, and coal tar 30 to 40. Both take 200 to 500 lb of sand.
- 3
Waste, then whole containers
It adds 10 percent for waste, rounds up to a whole gallon, and gives the fewest 55-gallon drums and 275-gallon totes that hold the order.
FAQ
Questions, answered straight.
How many gallons of sealer per square foot do I need?
At 100 to 120 sq ft per gallon of concentrate per coat, one coat takes 0.0083 to 0.01 gallon per sq ft and two coats 0.0167 to 0.02. A 10,000 sq ft lot needs 167 to 200 gallons of concentrate for two coats before waste.
How many square feet does a 55-gallon drum cover?
At 100 to 120 sq ft per gallon of concentrate, a 55-gallon drum covers 5,500 to 6,600 sq ft per coat, or 2,750 to 3,300 sq ft with two coats.
Do these numbers work for every sealer?
Coverage varies by product, so check your sealer's data sheet and change the coverage if it differs. If your sealer is sold ready to use, ask your supplier before adding water.
How many coats of sealer do I need?
Two. A third coat is optional at entrances, exits and drive lanes. Measure those as their own area and enter it as the extra coat.
Can I add more water to stretch the sealer?
No. Watered down sealer doesn't last as long. The calculator warns you if the mix is outside the usual range.
Is sand required in the mix?
Yes. Sand gives vehicles and people walking traction on the sealed surface.