Which products really pay the bills?
Revenue tells you what came in; margin tells you what stayed. List what you sell, the price, and what each costs to deliver. Your busiest line is not always the one paying the bills.
Gross margin is price minus direct cost, divided by price. Blended margin is total gross profit divided by total revenue. Ranking lines by margin rarely matches ranking them by sales.
The math
How this works
How do you calculate gross margin by product?
Take the price you charge for one unit and subtract the direct cost of delivering that unit. Divide the result by the price and you have the gross margin as a percent. A 150 dollar service that costs 60 dollars in materials and crew time carries 90 dollars of gross profit, which is a 60 percent margin. Multiply the per-unit gross profit by how many you sell in a month to see what that line contributes. Doing this for every line shows where the money is really made.
Which products are the most profitable to sell?
The most profitable line is the one that contributes the most gross profit in total, which depends on margin and volume together. A high-margin item sold twice a month can matter less than a thinner one sold two hundred times. The reverse is also common: a busy, low-margin line can take up most of your capacity while contributing little. Looking at margin percent and monthly gross profit side by side tells you which to push, which to reprice, and which is mainly keeping you busy. It also shows which line your blended margin is really resting on.
What counts as a direct cost?
Direct costs are what you would not spend if you did not sell that unit: materials, parts, subcontractors, shipping, payment processing on that sale, and the crew hours on that job. Rent, insurance, office pay, software, and marketing stay out, because they run whether or not that sale happens. Those overhead costs come out of gross profit later, which is why gross margin is a measure of the work itself rather than of the whole business. Keeping the line in the same place for every product is what makes the comparison fair.
Questions people ask
What is the difference between markup and margin?
Markup is measured against your cost, margin against your price. A 100 dollar cost sold at 150 dollars is a 50 percent markup and a 33 percent margin. This calculator reports margin, so a figure that looks lower than you expected may be the same pricing described the other way.
Should I count my own time as a cost?
If you perform the work, include the hours at a rate you would pay someone else to do it. Leaving your labor out makes margins look better than they are and hides which jobs you cannot afford to hand off. Time you spend on quoting, admin, and running the business is overhead, so keep that out of the direct cost.
Should I drop my lowest-margin line?
Not automatically. A thin line can still be worth keeping if it brings in customers who buy more later, fills slow weeks, or covers fixed costs you would pay anyway. The margin figure tells you what the line earns, not what it does for the rest of the business. Repricing, cutting the direct cost, or bundling it is often a better first move than dropping it.
What does the blended margin mean?
It is total gross profit divided by total revenue across every line you entered, so it is a weighted average rather than the average of the percentages. Shifting sales toward your higher-margin lines raises it without any price change. It is the figure to track month over month as your mix moves.
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This is an estimate to help you think, not financial, tax or legal advice. Finli is not a bank and does not lend. Your own numbers, and your banker, beat any calculator.