Road Salt / Deicer Calculator

Road salt quantity is calculated from the area to treat and the recommended application rate.

Pounds Needed = Area (sq ft) × Application Rate (lbs per sq ft)

Bags Needed = Pounds Needed / Bag Size

Unit conversions:

• Imperial: Area in sq ft, salt in pounds
• Metric: Area in m², salt in kilograms
• 1 lb/1000 sq ft ≈ 4.88 g/m²

Application rates:

Effectiveness by temperature:

How the calculator’s three rates line up with that table. The dropdown asks about conditions, not product, so its rates deliberately straddle the rock-salt band above. Light is 2 lbs per 1,000 sq ft (10 g/m²), which is below the 3 to 5 typical band because thin ice above 25°F melts with very little help. Medium is 4 (20 g/m²), squarely inside it. Heavy is 6 (30 g/m²), above it, because below 15°F rock salt is working near the edge of its useful range and needs the extra. If you are spreading calcium or magnesium chloride instead, drop one step: their medium is the calculator’s light.

Tips:

• More is not better. Excess salt damages concrete, lawns, and waterways
• Apply before the storm when possible (anti-icing), which uses about 75% less product
• Shovel/plow first, then apply deicer to what remains
• One coffee mug of salt (~12 oz) is enough for a 20-foot driveway section
• Sand provides traction but does not melt ice