How do you calculate cost of goods sold (COGS)?

COGS = Beginning Inventory + Purchases (plus any direct costs such as freight-in and direct labor) − Ending Inventory. It captures the cost of the inventory you actually sold during the period. For a retailer with $80,000 beginning inventory, $530,000 of purchases and direct costs, and $90,000 ending inventory, COGS is $520,000.

How is gross margin calculated from COGS?

Gross profit = Revenue − COGS. Gross margin = Gross profit / Revenue, expressed as a percentage. If revenue is $900,000 and COGS is $520,000, gross profit is $380,000 and gross margin is 42.2%. Margin shows how much of each sales dollar remains after covering the direct cost of goods.

What is the difference between periodic and perpetual inventory?

The periodic method calculates COGS once per period using beginning inventory, purchases, and a physical ending-inventory count — exactly the formula this calculator uses. The perpetual method updates inventory and COGS continuously after every sale using a point-of-sale or ERP system. Both arrive at the same annual COGS when inventory is counted accurately.

COGS Calculator — Cost of Goods Sold, Gross Profit & Margin

Q: What is the difference between COGS and operating expenses?

COGS includes only the direct costs of producing or buying the goods you sold — materials, direct labor, and freight-in. Operating expenses (SG&A) are the indirect costs of running the business — rent, marketing, salaries of non-production staff, and office overhead. Gross profit subtracts only COGS from revenue; operating income subtracts both COGS and operating expenses.

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Walk-through

How to Use This Calculator

4 steps

1

Enter beginning inventory

Type the dollar value of inventory on hand at the start of the period — this is the ending inventory from your previous period. Pull it from your opening balance sheet. Use cost, not retail value.

2

Add purchases and direct costs

Enter everything you bought or produced during the period. In the separate Additional Direct Costs field, add freight-in (inbound shipping) and direct labor if you manufacture goods. Leave that field blank if you are a simple reseller.

3

Enter ending inventory

Input the value of unsold inventory remaining at the end of the period, ideally from a physical count. The calculator subtracts this from goods available for sale to isolate the cost of what actually sold.

4

Add revenue and read the result

Switch to the Gross Profit & Margin tab and enter revenue to see gross profit and margin. The Inventory Turnover tab then shows how many times you cycled through stock. Use Copy, Share, or CSV to export your figures.

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Reference

Formula & Methodology

4 formulas

Cost of Goods Sold

COGS = Beginning Inventory + Purchases + Direct Costs − Ending Inventory

Goods available for sale = beginning inventory + purchases + direct costs. Whatever is not still on the shelf at period end must have been sold (or lost), so subtracting ending inventory isolates the cost of goods sold. Direct costs include freight-in and direct labor; they are part of the cost of getting inventory ready to sell.

Gross Profit

Gross Profit = Revenue − COGS

Gross profit is what remains after the direct cost of goods is covered, but before operating expenses such as rent, marketing, and administrative salaries. It is the first profitability line on the income statement.

Gross Margin

Gross Margin = Gross Profit / Revenue

Expressed as a percentage, gross margin shows how many cents of each sales dollar are left after paying for the goods. A 42% margin means 42 cents of every dollar of revenue is available to cover overhead and profit. It is the cleanest cross-company comparison of pricing power and cost efficiency.

Inventory Turnover

Turnover = COGS / Average Inventory, where Average Inventory = (Beginning + Ending) / 2

Turnover ties COGS back to the inventory that produced it. Days Sales of Inventory (DSI = 365 / Turnover) converts the ratio into how many days, on average, stock sits before selling. COGS — not revenue — is used because inventory is carried at cost.

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Glossary

Key Terms Explained

5 terms

Cost of Goods Sold (COGS) The direct cost of the inventory a business sold during a period — materials, freight-in, and direct labor for manufacturers. It appears on the income statement directly below revenue and excludes operating expenses like rent, marketing, and office salaries. COGS is the basis for gross profit and inventory turnover.

Beginning & Ending Inventory Beginning inventory is the cost value of stock on hand at the start of the period (equal to the prior period's ending inventory). Ending inventory is what remains unsold at period end, ideally verified by a physical count. The difference between them, combined with purchases, drives COGS.

Goods Available for Sale Beginning inventory plus purchases plus direct costs — the total cost of all inventory that could have been sold during the period. Subtracting ending inventory from this figure yields COGS.

Gross Profit & Gross Margin Gross profit is revenue minus COGS — the money left to cover overhead and generate net profit. Gross margin is gross profit divided by revenue, stated as a percentage. Margin lets you compare businesses of different sizes and is a core indicator of pricing power and cost control.

Markup vs. Margin Markup is gross profit divided by COST (gross profit / COGS), while margin is gross profit divided by REVENUE (gross profit / revenue). A 100% markup equals a 50% margin. Confusing the two is a common pricing error — this calculator shows both so you can price deliberately.

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Scenarios

Real-World Examples

3 worked examples

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Online Apparel Retailer

Reseller with simple inventory

Beginning Inventory $80,000 Purchases $520,000 Additional Direct Costs $10,000 Ending Inventory $90,000 Revenue $900,000

Goods available for sale are $610,000; subtracting $90,000 ending inventory gives COGS of $520,000. On $900,000 revenue that is a $380,000 gross profit and a 42.2% gross margin — healthy for apparel. Average inventory is $85,000, so the business turns stock about 6.1 times a year (a 60-day DSI). The freight-in captured in direct costs is small but correctly belongs in COGS, not operating expenses.

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Independent Restaurant

Tracking food cost percentage

Beginning Inventory $12,000 Purchases $180,000 Additional Direct Costs $0 Ending Inventory $14,000 Revenue $520,000

COGS is $12,000 + $180,000 − $14,000 = $178,000. Against $520,000 in sales that is a food cost of about 34% (COGS as a share of revenue) and a 65.8% gross margin — right in the healthy 28–35% food-cost target most restaurants aim for. Because perishables turn fast, average inventory is tiny ($13,000) and turnover is very high. For a restaurant the key number is the COGS-to-revenue percentage shown on the COGS tab.

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Small Manufacturer

Direct labor in COGS

Beginning Inventory $150,000 Purchases (materials) $600,000 Additional Direct Costs (labor) $200,000 Ending Inventory $180,000 Revenue $1,200,000

Here direct labor matters: materials of $600,000 plus $200,000 of direct labor lift goods available to $950,000, and ending inventory of $180,000 leaves COGS of $770,000. Gross profit is $430,000, a 35.8% margin — typical for light manufacturing. Forgetting to include direct labor would understate COGS by $200,000 and badly overstate margin, so manufacturers must capture it in the direct-costs field.

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Deep Dive

Cost of Goods Sold: The Number Behind Gross Profit

3 chapters · 5 min read

Cost of goods sold (COGS) is the single most important cost line for any business that sells physical products. It determines gross profit, drives gross margin, and feeds inventory turnover. This calculator computes COGS from the periodic-inventory formula, then chains it into margin and turnover so you can see the full picture from one set of inputs.

How COGS is calculated

The periodic formula is simple: Beginning Inventory + Purchases + Direct Costs − Ending Inventory. The logic is that everything available to sell, minus what is still on the shelf, equals what was sold. Beginning and ending inventory come from your balance sheet; purchases and direct costs come from the period's activity.

Direct costs are the part most people miss. Freight-in — the cost of getting inventory to you — is part of COGS, not a separate shipping expense. For manufacturers, direct labor and manufacturing overhead also belong in COGS. Anything required to make the product ready to sell is a direct cost; everything else (marketing, rent, admin) is an operating expense.

From COGS to gross profit and margin

Once you have COGS, gross profit is just revenue minus COGS, and gross margin is gross profit divided by revenue. Margin is the more useful figure because it normalizes for size: a corner store and a national chain can be compared on margin even though their dollar profits differ by orders of magnitude.

Watch the difference between margin and markup. Markup divides gross profit by cost; margin divides it by revenue. A product bought for $50 and sold for $100 has a 100% markup but a 50% margin. Pricing from markup while reporting on margin is a frequent source of confusion — the calculator displays both so you can keep them straight.

What counts as a 'good' margin depends on the industry. Grocery and distribution run thin (15–25%), general retail and manufacturing sit in the middle (30–45%), and software and premium services can exceed 70%. The verdict badge on the margin tab puts your number in that context.

Periodic vs. perpetual inventory, and what COGS leaves out

This calculator uses the periodic method: COGS is computed once per period from beginning inventory, purchases, and a physical ending count. The perpetual method updates inventory and COGS continuously after each sale through a point-of-sale or ERP system. Both produce the same annual COGS when counts are accurate; periodic is simpler for reporting, while perpetual gives real-time visibility.

Remember what COGS does not include: it covers only the direct cost of goods sold, never operating expenses. Gross profit minus operating expenses gives operating income — a separate line. If your ending inventory ever exceeds goods available for sale, the formula returns a negative COGS, which is impossible; the calculator flags this so you can recheck your figures. The cost-flow assumption you use for inventory (FIFO, LIFO, or weighted average) affects the dollar values you enter, but the formula itself is identical.

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Questions

Frequently Asked Questions

6 questions

What exactly counts as a direct cost in COGS?+

Direct costs are anything required to acquire or produce the goods you sold. For a reseller that means the purchase price of inventory plus freight-in (inbound shipping). For a manufacturer it also includes direct labor and manufacturing overhead — the wages of people who build the product and the factory costs tied to production. It does NOT include outbound shipping to customers, marketing, rent for your office, or administrative salaries; those are operating expenses that fall below gross profit on the income statement.

What is the difference between COGS and operating expenses?+

COGS is the direct cost of the goods you sold. Operating expenses (often called SG&A — selling, general, and administrative) are the indirect costs of running the business: rent, utilities, marketing, software, and the salaries of staff not directly making the product. Gross profit subtracts only COGS from revenue. Operating income subtracts both COGS and operating expenses. Keeping the two separate is essential — misclassifying operating costs as COGS distorts your gross margin and makes benchmarking meaningless.

How do I find beginning and ending inventory?+

Beginning inventory is the value of stock on hand at the start of the period — it equals the ending inventory from your previous period, so it carries over automatically year to year. Ending inventory is what remains unsold at period end, best determined by a physical count valued at cost. Both appear on the balance sheet. If you use accounting software with perpetual inventory, these figures are tracked for you; otherwise you count and value the stock at period end.

Why is my COGS showing as negative?+

A negative COGS means your ending inventory is larger than beginning inventory plus purchases plus direct costs — in other words, you appear to have more stock at the end than was ever available to sell. That is not physically possible, so it signals a data error: usually an overstated ending count, an understated purchases figure, or a missing direct-cost entry. The calculator displays a warning when this happens. Re-check each input, especially the ending inventory value.

How do gross margin and markup differ?+

Both measure profit on a sale, but against different bases. Gross margin = gross profit / revenue. Markup = gross profit / cost (COGS). They are not interchangeable: a 50% margin corresponds to a 100% markup. If you buy an item for $50 and sell it for $100, your markup is 100% ($50 profit on $50 cost) but your margin is 50% ($50 profit on $100 revenue). Pricing decisions usually start from markup, while financial reporting uses margin — this calculator shows both so you can move between them without error.

Does the inventory costing method (FIFO, LIFO, weighted average) change the result?+

The COGS formula is the same regardless of costing method, but the dollar values you plug in for inventory will differ. FIFO (first-in, first-out) assumes the oldest stock sells first, LIFO (last-in, first-out) assumes the newest sells first, and weighted average blends costs. In a period of rising prices, FIFO produces a lower COGS and higher profit, while LIFO produces a higher COGS and lower taxable profit. Enter whichever inventory values your accounting method produces; the calculator handles the arithmetic identically either way.

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COGS Calculator