How much ice melt do I need per square foot?

Wisconsin Salt Wise's de-icing chart (Dane County LWRD) gives rock salt at 2.3 lb per 1,000 sq ft at 28–32 °F, 2.3–4.5 lb at 23–28 °F and 2.3–6.8 lb at 15–23 °F. That is far less than most people spread.

What is the best ice melt for very cold temperatures?

Below 15 °F the chart does not recommend dry rock salt — it melts slowly and leads to over-application. Calcium or magnesium chloride is rated at 2.3–6.8 lb per 1,000 sq ft from 0 to 15 °F and 6.8 lb from −5 to 0 °F. Below −5 °F the guidance is to plow only and use sand for traction.

How much rock salt for a driveway?

Measure the paved area: a 20 × 50 ft driveway is 1,000 sq ft, so 2.3–4.5 lb of rock salt per application at 23–28 °F. Ten storms at that rate use 23–45 lb — a single 50 lb bag.

Should I shovel before salting?

Yes. Remove as much snow and ice as possible first; de-icer is meant to break the bond between ice and pavement, not melt all the snow. For later passes in the same storm, use half to the full initial rate.

Is ice melt safe for concrete, pets and plants?

Over-application is the main harm: salt that is never used washes into lawns, soil and streams. Sweep up leftover granules, keep new concrete (under a year old) free of de-icers where the manufacturer advises, and rinse pets' paws after walks.

Driveway

Ice Melt Calculator

Most people spread far more salt than ice needs. This calculator uses the Wisconsin Salt Wise application chart (Dane County LWRD): rock salt at 2.3 lb per 1,000 sq ft near freezing and up to 6.8 lb at 15–23 °F; calcium or magnesium chloride from 0 °F down to −5 °F. Enter the paved area, product and pavement temperature for pounds per storm, per season and bags to buy.

Next calculatorSnow Removal Cost CalculatorCompare per-visit plowing with a seasonal contract.

Ice melt application rates by pavement temperature

Pavement	Rock salt (sodium chloride)	Bagged blend, mostly sodium chloride	Calcium or magnesium chloride
28 to 32 °F	2.3 lb	2.3 lb	—
23 to 28 °F	2.3–4.5 lb	2.3–4.5 lb	—
15 to 23 °F	2.3–6.8 lb	2.3–6.8 lb	—
0 to 15 °F	—	—	2.3–6.8 lb
−5 to 0 °F	—	—	6.8 lb
Below −5 °F	plow only	plow only	plow only

Pounds per 1,000 sq ft for the first application; later passes in the same storm use half to the full first rate. A dash means the chart does not recommend that product at that temperature.

Worked example: a 20 × 50 ft driveway

1,000 sq ft of rock salt at 23–28 °F takes 2.3–4.5 lb per application. Ten storms use 23–45 lb — one 50 lb bag for the whole winter, if you shovel first and spread the granules apart.

Hiring the plowing out? Compare per-visit and seasonal prices with the snow removal cost calculator.

Sources

Dane County LWRD / UW–Green Bay, De-icing Application Rate Guidelines (Wisconsin Salt Wise)

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Frequently asked questions

How much ice melt do I need per square foot?: Wisconsin Salt Wise's de-icing chart (Dane County LWRD) gives rock salt at 2.3 lb per 1,000 sq ft at 28–32 °F, 2.3–4.5 lb at 23–28 °F and 2.3–6.8 lb at 15–23 °F. That is far less than most people spread.
What is the best ice melt for very cold temperatures?: Below 15 °F the chart does not recommend dry rock salt — it melts slowly and leads to over-application. Calcium or magnesium chloride is rated at 2.3–6.8 lb per 1,000 sq ft from 0 to 15 °F and 6.8 lb from −5 to 0 °F. Below −5 °F the guidance is to plow only and use sand for traction.
How much rock salt for a driveway?: Measure the paved area: a 20 × 50 ft driveway is 1,000 sq ft, so 2.3–4.5 lb of rock salt per application at 23–28 °F. Ten storms at that rate use 23–45 lb — a single 50 lb bag.
Should I shovel before salting?: Yes. Remove as much snow and ice as possible first; de-icer is meant to break the bond between ice and pavement, not melt all the snow. For later passes in the same storm, use half to the full initial rate.
Is ice melt safe for concrete, pets and plants?: Over-application is the main harm: salt that is never used washes into lawns, soil and streams. Sweep up leftover granules, keep new concrete (under a year old) free of de-icers where the manufacturer advises, and rinse pets' paws after walks.