Road Salt / Deicer Calculator
Calculate how many bags of road salt or deicer you need for your driveway, walkway, or parking area based on area and application rate.
Salt/Deicer Needed
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 poundsMetric: Area in m², salt in kilograms1 lb/1000 sq ft ≈ 4.88 g/m²
Application rates:
| Product | lbs per 1,000 sq ft | g per m² |
|---|---|---|
| Rock salt (NaCl) | 3–5 | 15–24 |
| Calcium chloride | 2–4 | 10–20 |
| Magnesium chloride | 2–4 | 10–20 |
| Sand (traction only) | 10–15 | 49–73 |
Effectiveness by temperature:
| Product | Effective Down To |
|---|---|
| Rock salt | 15°F (-9°C) |
| Calcium chloride | -25°F (-32°C) |
| Magnesium chloride | -13°F (-25°C) |
| Potassium chloride | 12°F (-11°C) |
Tips:
- More is not better — excess salt damages concrete, lawns, and waterways
- Apply before the storm when possible (anti-icing) — uses 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
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
SuperGlobalCalculator is independently built and maintained. See how we build and verify our calculators.