Everyday
Ice Melt Calculator
Enter your driveway, walkway and steps, pick a deicer product and the pavement temperature, and the page works out how much you need per storm, how many bags that is, and what a whole season costs.
How it works
Behind the numbers
The rate table is the heart of the page. Rock salt works down to about 15F, calcium chloride to about minus 25F, magnesium chloride to about 5F, and CMA to about 20F, and each product gets heavier rates as the pavement gets colder and the ice gets worse. A moderate ice storm above 25F needs about 8 pounds of rock salt per 1,000 square feet; the same storm at 15 to 25F needs about 14. Published rates disagree by wide margins, so the page calls these planning figures and tells you to spread thin and add more only where ice remains.
Areas add up before any rate applies. Driveway and walkway square footage come straight from your inputs, and each step counts as 3 square feet, which covers a typical tread plus the landing edge. The per-storm pounds divide by your bag weight and round up, because you cannot buy part of a bag, and the season total multiplies the per-storm pounds by your storms per season before rounding up again.
Two checks run alongside the math. If your product cannot work at your pavement temperature, the page says so and names calcium chloride as the usual cold-weather switch, instead of quietly returning a number for a product that will sit there. The safety note changes with the product too: rock salt is hard on paws, new concrete and plants, while CMA is the gentlest option and sand melts nothing at all.
FAQ
Questions, answered
How much ice melt do I need for a driveway?
A 600 square foot driveway plus a 150 square foot walkway and 6 steps is 768 square feet. At a moderate rate of 8 pounds of rock salt per 1,000 square feet above 25F, one storm takes about 6 pounds, so one 50 pound bag covers roughly 8 storms. Colder pavement and heavier ice raise the rate fast: the same area at 15 to 25F needs about 11 pounds per storm.
What temperature does rock salt stop working?
Rock salt stops melting ice near 15F pavement temperature, and it slows down well before that. Below 15F, calcium chloride is the usual switch because it keeps working down to about minus 25F. Pavement runs colder than air on clear nights, so check the surface temperature, not the forecast high.
Is ice melt safe for pets and concrete?
Rock salt is the harshest common option: it irritates paws, damages concrete less than a year old, and harms nearby plants. Magnesium chloride and CMA are gentler, and sand is safest because it melts nothing. Whatever you spread, rinse paws after walks and keep deicer off lawns and planting beds.
Should I apply ice melt before or after it snows?
Before, when you can. Deicer works best on a thin layer it can melt through, and pre-treatment keeps ice from bonding to the pavement. Shovel first when snow is deep: no deicer replaces a shovel, and spreading product on top of inches of snow wastes most of it.
How many bags of ice melt will I use in a season?
Multiply one storm by your storms per season. The default example, 768 square feet of rock salt at a moderate rate above 25F, takes about 6 pounds per storm, so 12 storms use about 74 pounds, or 2 fifty-pound bags. Colder winters, heavier ice and bigger areas push that up quickly, which is why storms per season and bag price are editable.