What information should you collect first?

Write down your calculation period and what counts as one sale. For a shop, that might be one product. For a freelancer, choose a clearly defined service package before entering any costs.

Separate fixed and variable costs

Fixed costs do not change with production or sales volume. Variable costs rise or fall with production. Rent and office payroll are examples of fixed costs; raw materials and production labour are examples of variable costs. Shopify defines both categories.

Use the payment arrangement to classify an expense. For a hypothetical design studio, inspect the terms for an office rental and an outside illustrator separately. Ask whether each payment stays the same or changes with the work delivered.

Keep uncertain entries visible. Add a note identifying the document or person needed to confirm each amount. Before calculating, check that you have not combined a quarterly fixed-cost total with a monthly sales target.

Give every amount a source

Put the invoice reference or contract name beside each input. Ask a colleague to trace the figures without your explanation. If they cannot identify where an amount came from, resolve that gap before using the result to approve spending.

How do you calculate units and sales revenue?

Calculate what each sale contributes toward fixed costs before dividing anything. This amount is called the contribution margin per unit: selling price minus variable cost per unit. It is the portion left to cover fixed costs, rather than an immediate measure of net profit. The contribution formula explains this distinction.

The break-even formula

Break-even units = total fixed costs ÷ (selling price per unit − variable cost per unit). Use costs and sales from the same calculation period. Shopify gives the unit-sales formula.

1. Subtract the variable cost from the selling price.
2. Divide the period's fixed costs by that difference.
3. Label the result with the unit and period.
4. Check each input against the records you collected.

The revenue version

The contribution margin ratio is the contribution per unit divided by its selling price. Divide fixed costs by this ratio to find break-even sales revenue. The revenue formula expresses the threshold in money instead of units.

If the selling price does not exceed variable cost per unit, the usual model cannot cover positive fixed costs through additional sales. Revisit the offer before setting a larger volume target. The break-even overview describes this condition.

What does a complete worked example look like?

Use the published ABC Shipfast example to check your method. Shopify explicitly presents it as a hypothetical business, with quarterly fixed costs of $5,000, a selling price of $200 per unit, and variable costs of $100 per unit. These are the source's illustrative figures.

• Contribution per unit: $200 − $100 = $100.
• Break-even volume: $5,000 ÷ $100 = 50 units per quarter.
• Contribution margin ratio: $100 ÷ $200 = 0.5.
• Break-even revenue: $5,000 ÷ 0.5 = $10,000 per quarter.

Both calculations describe the same threshold in that hypothetical example. One gives the number of products; the other gives the associated revenue. Shopify shows both results.

Transfer the method, not the amounts

Replace every input with your own records before using this for your business. Keep the original example in a separate worksheet if you want a reference calculation. Do not relabel the published dollar amounts as local market prices.

For a service business, define the package just as carefully as a shop defines a product. Write down what delivery includes and which outside costs belong to that package. Keep requests outside the package separate when checking the estimate.

How should the result change your next decision?

Compare the threshold with your sales plan, then choose one change to examine. Break-even analysis can inform pricing, sales targets, and cost management. Shopify identifies these business uses.

Review a proposed price change

Holding other inputs constant, a higher selling price lowers the required unit volume. In the published hypothetical example, raising the price from $200 to $225 reduces the threshold from 50 units to 40 units. Shopify provides this price scenario.

Write the proposed price beside the existing price, then calculate each scenario separately. Add a customer-reaction check to your plan before adopting the change. For that conversation, use the guide to raising prices without losing customers.

Choose a cost question worth investigating

Reducing fixed or variable costs can lower the break-even threshold. The overview discusses both options. Start your review with one contract or production expense, using this small-business cost guide to organise the next steps.

Give your marketing team a specific brief: the offer, its price, the calculation period, and the required sales volume. Ask them to explain how the proposed campaign connects to those sales. Recalculate if the campaign adds costs to the period.

Which assumptions need a second look?

Check the model before trusting the output. Simple break-even analysis assumes stable selling prices and unit variable costs within its scope. With several products, the sales mix matters too. The limitations section explains these assumptions.

Sales mix means the proportions of different products sold. For a hypothetical online shop offering several gift bundles, list each bundle separately before combining the figures. Record the assumed proportions and ask your accountant to review the combined calculation.

• Before a discount, replace the normal selling price with the proposed price.
• Before expanding, update the fixed-cost total for the planned arrangement.
• Before switching suppliers, update the relevant unit costs.
• Before combining products, document the expected sales mix.

Alongside the calculation, make a separate schedule of expected receipts and payments. Use the guide to managing small-business cash flow for that task. Keep payment timing visible when deciding what you can commit to next.

For a new venture, test the demand assumption as well as the arithmetic. SBA recommends examining demand, market size, alternatives, and pricing when researching a market. Its planning guide outlines those questions; connect them to your business idea validation plan.

What should you finish this week?

Aim to finish with a checked calculation and one written decision. Use a spreadsheet you already know or a simple paper worksheet. Put the date of your review beside the assumptions so you know which version you discussed.

1. Collect. Gather the expense records, price information, and sales figures for your chosen period.
2. Classify. Separate fixed and variable costs and mark unresolved entries.
3. Calculate. Work out the threshold in both units and sales revenue.
4. Challenge. Compare the required volume with your sales plan and delivery capacity.
5. Decide. Assign one action, an owner, and a review point.

Add the calculation and assumptions to your business plan financials. SBA describes a business plan as a guide for structuring, running, and growing a business. Its business-planning guidance provides that context.

If you are preparing a funding discussion, bring the underlying cost records as well as the result. Use the small-business investor guide to organise the wider conversation. Explain the assumptions before presenting the sales target.