How to Calculate Snow Blower Impeller Cost in 5 Steps

Step 1: Count the impellers the blowers actually need

Start with the blowers being repaired, not the impellers on sale. A blower being fixed needs one replacement impeller, and a second blower kept for a long driveway needs its own impeller too \u2014 so the default count here is 1 impeller, the replacement for the blower in the shed, not a spare and not impellers for a second blower that belongs in a different budget. Check the impeller diameter and blade count before you settle the count, because impellers are made for specific housings and an impeller for the wrong housing is not a saving even at a sale price. Write the count down before you look at any price: once a sale price is in front of you, it is easy to buy the impellers on offer rather than the impeller the housing needs.

Step 2: Find the price per impeller

Use the shelf price for the impeller your blower actually takes \u2014 $49.99 an impeller on the defaults. Impellers differ by diameter, blade count and hub, and an impeller that does not match the housing will not throw snow far enough, while one that needs shimming adds a second purchase on top of the first. Do not use one average price for every blower, and do not use an impeller whose diameter you have not checked against the old impeller coming off the blower. If the shop lists an impeller with a hub kit, work out whether that kit is already included in the price before you apply a discount in step 4.

Step 3: Multiply count by price for the subtotal

The subtotal is the count times the price each: 1 × $49.99 = $49.99. This is the figure before anything is taken off and before any tax is added, and it is the figure most people mistake for the total. It is not the total \u2014 it is only the starting point. If your subtotal looks wrong, the count or the price is wrong, because this step is pure multiplication; fix the input, not the arithmetic.

Step 4: Take the discount off the subtotal

Multiply the subtotal by one minus the discount rate: $49.99 × 90% = $44.99 at 10% off. The discount comes off the subtotal, not off the taxed total, and that order matters \u2014 it is also why a bigger discount shrinks the tax in the next step. If a voucher applies only to certain impellers, apply it only to those impellers\u2019 share of the subtotal, not to the whole basket.

Step 5: Add the tax, then check the per-impeller figure

Tax is charged on the discounted price: $44.99 × 6% = $2.70, so the total is $44.99 + $2.70 = $47.69. Then divide by the count to check the per-impeller figure: $47.69 ÷ 1 = $47.69 an impeller. That per-impeller figure is the one to compare against other shops and other impellers \u2014 if it is far above the shelf price you started with, something went wrong, because a discount should pull the per-impeller figure close to the shelf price, not far above it.

Worked example

1 impeller, $49.99 an impeller, 10% off, 6% tax. Subtotal: 1 × $49.99 = $49.99. Discounted: $49.99 × 90% = $44.99. Tax: $44.99 × 6% = $2.70. Total: $44.99 + $2.70 = $47.69, which is $47.69 an impeller. At 4 impellers the same arithmetic gives $199.96 subtotal, $179.96 discounted, $10.80 of tax, $190.76 in all. At no discount the same 1 impeller costs $49.99 plus $3.00 of tax, $52.99 in all. The Winter Snow Blower Impeller Cost Calculator reproduces every one of these figures from the same inputs.

Three mistakes that break the total

First, taxing the pre-discount price: tax on $49.99 instead of $44.99 adds $0.30 of phantom tax and lands on $47.99 instead of $47.69. Second, counting impellers on offer instead of impellers the blowers need: buying 4 impellers when one blower needs 1 ties up $143.07 that could have stayed in the household budget. Third, using the wrong impeller\u2019s diameter: an impeller that does not match the housing is not a saving if it has to be returned and the right one bought anyway \u2014 price the impeller the housing takes, then look for that impeller on sale.

Frequently asked questions