United Kingdom version
How it works
Calculate a single-product contribution break-even with whole-unit rounding and a clearly defined accounting period.
This is the United Kingdom planning view, with monetary inputs and outputs in GBP. A currency label does not establish that a tax rate, construction price, coverage rule or legal limit has been verified locally. The inputs and limitations below describe the actual scope.
Input query strings and outputs
Use an input name in this page’s URL as ?name=value, and join additional inputs with &. Portable shared links may instead use the compact ?ac= state parameter.
Input query strings
4-
?fixedCost=Fixed costs in one consistent periodMoney · Required · Default: 10,000
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?unitPrice=Net selling price per unitMoney · Required · Default: 50
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?variableCost=Variable cost per sold unitMoney · Required · Default: 30
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?targetProfit=Target profit in the same periodMoney · Required · Default: 0
Outputs
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contributionContribution per unitCurrency · Currency: GBP
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breakEvenUnitsWhole units required to break evenNumber
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targetUnitsWhole units required for target profitNumber
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targetRevenueRevenue at rounded target unitsCurrency · Primary output · Currency: GBP
Formula
whole target units = ceiling((fixed costs + target profit) ÷ (unit price − variable cost)).
Calculations retain numeric precision internally. Displayed values are rounded for readability. Quantities that must be purchased as whole units are rounded up only where the formula explicitly requires it.
Read the inputs before calculating
- Fixed costs in one consistent period: Enter the quantity described by the label.
- Net selling price per unit: Enter the quantity described by the label.
- Variable cost per sold unit: Enter the quantity described by the label.
- Target profit in the same period: Enter the quantity described by the label.
Reproducible worked example
The following is a fictional arithmetic example, not a local quote, a verified claimant or a market forecast. Its values are included so the formula can be checked. The form does not automatically confirm any verification checkbox.
| Input | Example value |
|---|---|
| Fixed costs in one consistent period | 10,000 |
| Net selling price per unit | 50 |
| Variable cost per sold unit | 30 |
| Target profit in the same period | 0 |
| Output | Calculated result |
|---|---|
| Contribution per unit | GBP 20 |
| Whole units required to break even | 500 |
| Whole units required for target profit | 500 |
| Revenue at rounded target units | GBP 25,000 |
Interpreting a changed assumption
Start with one complete scenario and change only one input when diagnosing a difference. Recheck units, the period of every rate, whether an amount is recurring or one-off, and whether a cost is already included elsewhere. A larger calculated benefit is not evidence that an assumption is more likely to occur.
Limitations
- Inputs are explicit management assumptions. This is not a valuation opinion, tax filing, employment-law assessment or investment recommendation.
- Prices and costs must use the same sales-tax treatment. Capacity constraints, product mix, stepped fixed costs and demand are not inferred.
Frequently asked questions
What does this Business Break-Even result represent?
Calculate a single-product contribution break-even with whole-unit rounding and a clearly defined accounting period. It applies the displayed formula to your inputs; it does not infer omitted facts.
Are the starting amounts verified United Kingdom prices or legal rules?
No. Numeric defaults are illustrative unless an input or dated reference explicitly identifies a researched component. Currency is GBP; local quotes, eligibility and unsupported rules must be entered and verified separately.
What must I check before relying on the result?
Inputs are explicit management assumptions. This is not a valuation opinion, tax filing, employment-law assessment or investment recommendation.
Can I compare or share different assumptions?
Change one assumption at a time and use the browser-local project or share controls. A shared URL contains the encoded input values; do not include information you do not wish to disclose.
Sources and reference scope
- SBA break-even formula — retrieved 2026-09-25. Single-product contribution-margin arithmetic, not a statutory accounting opinion.
- SBA break-even input worksheet — retrieved 2026-09-25. Fixed versus variable cost inputs. Our formula uses the entered period; quarterly costs divided into months require division by three, not the inconsistent by-four wording on the reference page.
These references support only their stated scope. They are not evidence that every local rule or price needed by the master expansion has been loaded.