Fixed Costs vs Variable Costs (With Examples)

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Published September 23, 2026 · Updated September 29, 2026

Learn fixed costs vs variable costs examples with clear formulas, realistic scenarios, and steps to calculate contribution margin and break-even sales.

Break-Even Concepts · Financial Planning · Small Business

Fixed costs stay the same in total over a relevant level of activity, while variable costs rise or fall with the number of products or services you sell. For pricing and break-even planning, you need to separate the two because fixed costs are spread across sales, but variable costs are attached to each sale.

Quick answer: Fixed costs do not change in total when sales volume changes, such as rent or a software subscription. Variable costs change with each unit sold, such as ingredients, packaging, or sales commissions. Add fixed costs to find your operating base; subtract variable cost per sale from price to see what each sale contributes toward profit.

The direct answer

A fixed cost remains constant in total for a period, provided you stay within a normal operating range. If your shop sells 100 or 200 items this month, its monthly rent may still be $2,000. Other examples can include a basic insurance premium, a salaried office manager, accounting software, and a business license fee.

A variable cost changes in total as activity changes. If you make twice as many products, you generally buy more materials. If you serve more customers, you may use more ingredients, disposable supplies, shipping materials, or transaction-based labor. A cost that is $4 per unit creates $400 of total cost at 100 units and $800 at 200 units.

Use this basic structure:

• Total fixed costs: costs that do not change in total with short-term volume.
• Variable cost per unit: the cost directly associated with one unit, order, job, or customer.
• Contribution margin per unit: selling price minus variable cost per unit.
• Operating profit: total sales minus total variable costs minus total fixed costs.

For example, if you charge $30 for a service and spend $12 on supplies and payment-related costs, your contribution margin is $18 per service. If monthly fixed costs are $1,800, you need 100 services to cover that fixed-cost base because $1,800 ÷ $18 = 100. Sales above that point can contribute to operating profit, assuming the cost assumptions remain accurate.

What changes the answer

The time period matters. Rent is usually fixed month to month. Over several years, a lease may renew at a higher amount. State the time frame for your analysis.

The activity range matters. A small bakery may use its existing oven for 500 items a week. If demand reaches 1,000 items, it may need another oven or an extra shift. The original equipment cost behaves like a fixed cost within the first range, then the business takes a step up to a higher fixed-cost level.

Some costs are mixed. A phone plan can include a fixed monthly charge plus usage fees. A delivery arrangement can include a base fee plus a per-mile charge. Separate the base and usage portions when you can. If you cannot separate them precisely, make a reasonable estimate and label it as an assumption.

The unit must be clear. For a house cleaner, the unit might be one cleaning job. For a restaurant, it might be one meal, one order, or one cover. For a subscription business, a monthly subscriber may be the useful unit. Choose a unit that matches how you price and serve customers.

Timing is not the same as behavior. An annual insurance bill can create a large cash payment in one month, but the underlying expense may cover twelve months. Pricing policies can change variable cost. A discount may lower your revenue per unit without lowering ingredients, labor, or fulfillment costs. Free shipping may turn a cost you normally pass to the customer into a variable cost you absorb. Review the actual offer, not only the standard price.

2-3 realistic worked scenarios

Scenario 1: House cleaning service

You charge $160 for a standard cleaning. Supplies cost $10 per job, payment processing averages $5 per job, and you pay a cleaner $85 per completed job. The variable cost per job is therefore $100:

`$10 + $5 + $85 = $100`

The contribution margin is $60 per job:

`$160 - $100 = $60`

Your monthly fixed costs are $2,400. They include insurance, scheduling software, phone service, storage, and a regular administrative wage. The break-even volume is:

`$2,400 ÷ $60 = 40 jobs`

At 40 jobs, revenue is $6,400 and variable costs are $4,000. The remaining $2,400 covers fixed costs, so operating profit is $0. At 45 jobs, revenue is $7,200 and variable costs are $4,500. After fixed costs, operating profit is $300:

`$7,200 - $4,500 - $2,400 = $300`

That calculation also shows why a price increase should be tested against demand. An extra $10 per job would increase contribution margin if job volume and variable cost stayed the same, but the result changes if the higher price reduces bookings. For related pricing decisions, see margin and markup.

Scenario 2: Small restaurant menu item

A restaurant sells a bowl for $14. Ingredients cost $4.20, the disposable container costs $0.60 for takeout orders, and a per-order fee averages $0.40. For a takeout bowl, variable cost is $5.20:

`$4.20 + $0.60 + $0.40 = $5.20`

The contribution margin is $8.80:

`$14.00 - $5.20 = $8.80`

Suppose monthly fixed costs allocated to the restaurant operation are $17,600. This includes rent, core salaried labor, insurance, and recurring systems. The number of bowls needed to cover that amount, if the bowl were the only item analyzed, is 2,000:

`$17,600 ÷ $8.80 = 2,000 bowls`

At 2,300 bowls, sales are $32,200. Variable costs are $11,960, calculated as `2,300 × $5.20`. Operating profit after the stated fixed costs is $2,640:

`$32,200 - $11,960 - $17,600 = $2,640`

ways to lower your break-even point for a related pricing framework.

Scenario 3: Handmade product sold online

You sell a candle for $28. Wax and fragrance cost $6.50, the jar and label cost $3.50, packaging costs $2, and average payment and marketplace fees are $2.80. Total variable cost is $14.80:

`$6.50 + $3.50 + $2.00 + $2.80 = $14.80`

Contribution margin is $13.20 per candle:

`$28.00 - $14.80 = $13.20`

Monthly fixed costs are $1,584 for design software, insurance, a small studio, and baseline marketing subscriptions. Break-even volume is 120 candles:

`$1,584 ÷ $13.20 = 120 candles`

If you sell 150 candles, revenue is $4,200 and variable cost is $2,220. Operating profit is $396 after fixed costs:

`$4,200 - $2,220 - $1,584 = $396`

How to run your own numbers

Start with one period, such as one month, and one unit of activity. A job, order, meal, or product is usually easier to analyze than a vague “customer.” Write down the price you actually collect, after routine discounts, rather than the list price.

Use the MyBreakeven calculator to test your assumptions.

Next, list every cost that increases when you deliver one more unit. Include materials, packaging, per-order fees, shipping you pay, commissions, and labor that is paid per job or hour of production. Divide the total by expected units to estimate variable cost per unit. Keep a note beside each estimate so you can replace it with actual results later.

Then total the costs that remain for the period even if you sell nothing. Include recurring rent, baseline payroll, insurance, subscriptions, licenses, and planned overhead. Do not count the same cost in both lists.

Use these formulas:

`Contribution margin per unit = selling price per unit - variable cost per unit`

`Break-even units = total fixed costs ÷ contribution margin per unit`

`Operating profit = (units sold × contribution margin per unit) - total fixed costs`

How to calculate variable cost per unit from your own jobs

For a service business, begin with completed jobs from one consistent period. Imagine a cleaning team delivered 80 standard visits last month. Supplies consumed on those visits cost an illustrative $640, payment fees were $240, and labor paid specifically to complete the visits was $5,600. These costs total $6,480. Divide by the 80 completed visits: $6,480 ÷ 80 = $81 variable cost per visit. At a collected price of $145 per visit, each job contributes $145 − $81 = $64 before monthly fixed costs.

Suppose the business also has $3,200 monthly fixed costs, including planned administration and owner pay not already counted as per-job labor. Break-even is $3,200 ÷ $64 = 50 completed standard visits. At 40 visits, contribution is $2,560 and the model is $640 short. At 60, contribution is $3,840 and the model leaves $640 after fixed costs. That holds only while the job mix, collected price, per-job cost and available staff remain close to the assumptions. These are fictional example numbers, not typical US cleaning prices.

If a phone plan has a $95 base charge plus $0.30 for each booking, put the $95 in the period's fixed costs and $0.30 in cost per booking. A full $119 bill for 80 bookings is not $119 of variable cost; allocating the fixed base to every booking and also entering $95 as fixed would count it twice. If you run out of crew capacity at 50 visits and must pay a new guaranteed shift, calculate a second range with that added fixed or step cost instead of projecting the original $64 contribution indefinitely. Our contribution margin guide shows how this per-job amount flows into sales goals.

Common mistakes

Calling every recurring cost fixed. A monthly bill may contain a usage component. Separate the base charge from the amount that grows with activity.

Ignoring labor that follows sales. If you pay someone per job, per item, or per hour worked, that labor belongs in the variable-cost calculation for the relevant decision. Otherwise, your contribution margin will look too high.

Using revenue instead of contribution margin. Revenue does not show what remains after fulfilling an order. Break-even volume based only on price will understate the sales needed.

Mixing cash timing with cost behavior. An annual renewal is not automatically a variable cost because cash leaves the bank once a year. Spread the expense for operating analysis while separately planning the cash payment.

Forgetting discounts, refunds, and waste. Your real selling price may be lower than the advertised price. Your real material usage may be higher than the recipe or bill of materials. Use observed averages when possible.

Rounding too early. Keep cents through the contribution-margin calculation. Round the final break-even unit target up because partial units do not cover a real sales target.

FAQs

What is the variable cost per unit formula?

Add the costs that increase when you deliver the units in a comparable period, then divide by the number of completed units. Check that each expense is included once and the units share a comparable scope.

Is an hourly wage always a variable cost?

Job-paid production time often changes with completed work, but a guaranteed shift may remain payable even if bookings fall. Model the actual pay arrangement and staffing range rather than assuming all labor behaves the same way.

Can an annual payment be a fixed cost?

Yes. Fixed and variable describe cost behavior as activity changes, not the date cash leaves the account. Plan the annual cash payment separately from the operating analysis.

What if one job takes twice as long as another?

Use job types or a weighted mix rather than one average across unlike services. A deep clean and a standard maintenance visit may need separate per-job labor and price assumptions.

Are payment-processing fees fixed or variable?

A fee charged per transaction or as a percentage of each payment varies with sales. A monthly account minimum or subscription component is fixed within its relevant range; split a mixed fee where records allow it.

For another angle, see worked break-even analysis example. Browse the small business guide library for more planning examples.