Price vs volume analysis for distributors

A supply house that grew 8% this year might have sold more product. Or it might have sold the same product, or less, at higher prices. The sales report looks the same either way.

Separating price from volume tells you which one happened. This guide explains why the split matters right now, how large distributors report it, and how to run a simple version from your own data.

Why the split matters right now

Product prices have moved a lot. Border States' October supply chain update put copper 31% above a year earlier and hot-rolled steel 57% above (tED). When the product costs more, the same customers spend more for the same work.

That makes sales growth a weak signal by itself. A contractor whose spend is up 5% while prices on what they buy rose 10% is buying less from you. On a sales-by-customer report, that account looks like it's growing.

How the big distributors report it

Large distributors split their growth into price and volume because investors ask. Three examples from October 2026:

• Wesco: "Pricing contributed approximately 3% and volume approximately 14%" of its 16.6% third quarter growth, according to its CFO (transcript).
• Watsco: residential HVAC equipment sales grew 7%, from 5% unit growth and a 2% higher average selling price (Q3 release).
• Rexel: described its 11.4% like-for-like growth as "a well-balanced contribution between volume and price" (tED).

An independent doesn't report to investors, but the same question applies: is the business growing, or are prices?

The three parts of a sales change

Price

How much more or less you charged for the same items. If a box of wire nuts sold for $10 last year and $11 this year, that's a 10% price effect on that item.

Volume

How much more or less product you sold, measured in units, feet, pounds or lines.

Mix

Changes in what customers bought. If contractors shifted from a $300 unit to a $500 unit, sales go up even with the same number of units. Mix is often grouped with volume in simple versions.

How to separate price from volume

1. Export item-level sales for this year and the same period last year: item, quantity and sales dollars. Prophet 21, Eclipse and QuickBooks can all produce this.
2. Match items sold in both periods. Use only items with sales in both years for the price calculation.
3. Calculate the price effect. For each matched item, take this year's quantity times the change in average price. Add them up.
4. Calculate the volume effect. For each matched item, take the change in quantity times last year's average price. Add them up.
5. Account for the rest. New items, discontinued items and the small leftover from the math together make up mix and other effects.
6. Express each as a percent of last year's sales. You now have a split like Wesco's: price, volume and other.

A simpler shortcut, if item-level detail is hard to get: pick your top 20 items by sales, compare their unit counts year over year, and compare total sales growth to unit growth. It's rough, but it shows which way things are moving.

Run it by customer, too

The company-wide split tells you about the business. The same split by customer tells you about relationships.

For each of your top 50 accounts, compare:

• Sales growth: this year vs. last year.
• Volume growth: units or lines vs. last year.

Accounts where sales are up and volume is down are buying less from you at higher prices. They're often splitting work with another supplier, and they're the ones to call first. HARDI's 2025 research found 83% of HVAC contractors use three or more suppliers, so a share shift like this is easy for a customer to make and easy for a distributor to miss.

Common mistakes

• Celebrating sales growth in an inflationary year. Check volume before deciding the year was good.
• Using only dollars per order. Larger invoices may just mean higher prices.
• Doing it once a year. A quarterly split catches changes while there's still time to act.

Frequently asked questions

What is price volume analysis? Price volume analysis splits a change in sales into the part caused by charging different prices and the part caused by selling a different amount of product. Some versions also separate mix, the effect of customers buying different items.

How do distributors measure volume? Use the unit that fits the product: each, feet, pounds or cases. When products are too varied to add up, count order lines as a rough measure of volume.

Why do sales go up while volume goes down? Usually because prices rose faster than customers cut back. It can also mean customers shifted to more expensive items. Checking by customer shows which accounts are actually buying less.