How Much Salt to Order for the Winter: A Worksheet for Snow Contractors

The formula

For each site: treated area ÷ 1,000 sq ft × rate per 1,000 sq ft × applications per season. Add the sites together, then add a margin for a bad winter.

In metric: treated area in m² × grams per m² × applications. One pound per 1,000 sq ft is about 4.9 g/m², so 10 lb per 1,000 sq ft is about 49 g/m².

Step 1: Measure the treated area of each site

• Only count the areas the contract says you de-ice.
• Keep lots and drive aisles separate from walks, steps and ramps. Walks are often treated more often, and sometimes with a different product: bagged salt, treated salt, or a blend that works at colder temperatures.
• Use the measurements from your estimate or site walk, not the whole parcel.

Step 2: Set your rate per application

Use the rate your own spreader actually puts down, measured at the start of the season. The salt application rates cheat sheet gives a starting band for straight rock salt (roughly 8–16 lb per 1,000 sq ft, about 40–80 g/m², depending on pavement temperature) and explains how to calibrate. Anti-icing before a storm uses far less.

Step 3: Estimate applications per season

• Your own records first. Count the de-icing applications per site in your logs or invoices from the last few winters.
• No history? Count the days in past winters with snow, freezing rain, or temperatures crossing freezing with moisture around, using Environment and Climate Change Canada’s historical climate data or NOAA’s Climate Data Online in the US. A snowfall often needs more than one application: after plowing, and again if it refreezes.
• New sites: use a similar site you already service nearby.

Step 4: Add a margin for a bad winter

Compare your worst recent winter with your average one and size the margin from that gap. Running out in February usually costs more than carrying a surplus, and salt stored dry keeps until next season.

A worked example

Three sites, a rate of 10 lb per 1,000 sq ft (about 49 g/m²), and an illustrative 30% margin. The walks are treated more often than the lots because they are done after every shovelling and on refreeze mornings.

Step 5: Check it fits your storage

Bulk rock salt is commonly cited at roughly 70–80 lb per cubic foot (about 1.1–1.3 tonnes per cubic metre), so the 7 tonnes above take about 5.4–6.4 m³ (roughly 190–220 cubic feet) before you allow for the slope of the pile and room to load. Ask your supplier for their product’s figure.

• Store it under a roof or a cover, on pavement or a concrete pad that water can’t soak through, so it stays dry and doesn’t wash away.
• Keep it away from drains, ditches, streams and wells; salty runoff harms water and soil.
• Load and unload on the pad, and sweep up spills.
• Keep bagged product on pallets, off the ground and covered.
• Check your municipality’s and your province’s or state’s rules on salt storage.

Step 6: Decide how to buy it

• Fill storage in the fall, then top up through the season.
• Read supply contracts for two numbers: any minimum share of the estimated quantity you commit to buy, and any maximum the price holds for.
• Ask how long deliveries take in a storm week.
• Bagged salt costs more per tonne than bulk, but it suits walks and small sites with no storage.
• Industry groups such as SIMA and, in Canada, the Smart About Salt Council run training on storing and applying salt.

Your salt usage is part of your price

If your prices include the salt, the usage per site from this worksheet is a cost each application’s price has to cover. A site that takes twice the salt of its neighbour shouldn’t carry the same price per application. The free pricing calculator shows the per-visit math, and when to pre-salt covers using less by treating before the bond forms.

Start next fall from what really went down

In Icey Software the crew logs the product and the amount put down at each site during the visit, alongside the visit’s time, GPS and photos. By spring that is a record of what each site actually took, which is a better starting point for next fall’s order than this year’s estimate. Salt amounts stay in your own records and never appear on the client’s site report. The Free plan covers up to 5 operator seats and up to 15 active sites, with no card.