Act on the result
Test the smallest operating-hours change that can prove incremental demand before committing permanently.
Educational only: Business decision support, not accounting, tax or legal advice.
Privacy: No account is required. Tool inputs and results stay in this browser. Anonymous categorical usage analytics send only governed page, tool, cluster and action identifiers; tool inputs and results are never sent. Error monitoring is disabled. Optional saved state stays only on this device.
Update policy: Reviewed when formulas or official dependencies change.
Scope: Market-neutral small-business planning using your own assumptions.
What this planner helps you decide
Best for
Operators testing a proposed extension or reduction in opening hours.
Outputs
Incremental revenue, incremental cost, contribution and break-even demand.
Start here
Enter only sales and costs caused by the changed hours, including staffing and operating overhead.
Use a different tool when: Do not use this to find the occupied-capacity threshold required to cover period fixed cost; use Occupancy Break-even Planner for that decision. Use this tool to test whether additional opening hours cover their incremental operating cost.
Profit & break-even
Opening Hours Profitability: incremental revenue
Incremental revenue, incremental cost, contribution and break-even demand.
Amounts use the same currency as your inputs. No currency conversion is performed.
Opening Hours Profitability
Test whether additional opening hours earn enough unit contribution to cover labour, utilities, security and fixed opening cost.
Your numbers stay in this browser
Enter added hours for the decision period.
Enter a units-per-hour scenario; this is not a forecast.
Enter revenue less avoidable cost for each additional unit. Use one consistent ex-tax currency basis.
Enter incremental loaded labour cost for each added hour. Use one consistent ex-tax currency basis.
Enter incremental premises and security cost per added hour. Use one consistent ex-tax currency basis.
Enter any cost incurred once for the added opening period. Use one consistent ex-tax currency basis.
Decision result
Review the operating threshold and incremental comparison on the same entered capacity, cost and demand basis.
- Additional units
- 50 units
- Incremental contribution
- 200.00
- Contribution per additional hour
- 20.00
- Break-even units per hour
- 3 units
Scenario comparison
Each row names the assumption axis changed from the baseline.
ScenarioResultDifference
Entered scenario200.00Baseline
Lower Expected units per hour100.00-100.00
Higher Expected units per hour300.00100.00
Save these results, change an input, then compare the updated figures with this baseline.
The baseline is temporary in this tab and is not added to shared scenario links or generated reports.
Calculation details
View calculation detailsView the formulas and inputs used for these results.
Additional units
Additional units
additional hours × expected units per hour50 unitsResult50 units
Uses the exact shared engine result and only the entered market-neutral operating assumptions. The engine retains raw precision; display formatting does not feed calculation.
Opening Hours Profitability Planner formulas →Inputs used by these formula steps
- Additional unitsAdditional Hours
- 10
- Additional unitsExpected Units Per Hour
- 5
- Additional unitsContribution Per Unit
- 10
- Additional unitsLabour Cost Per Hour
- 20
- Additional unitsUtilities And Security Per Hour
- 5
- Additional unitsFixed Opening Cost
- 50
Incremental contribution
Incremental contribution
additional units × contribution per unit − additional hours × (labour cost per hour + utilities and security per hour) − fixed opening cost200.00Result200.00
Uses the exact shared engine result and only the entered market-neutral operating assumptions. The engine retains raw precision; display formatting does not feed calculation.
Opening Hours Profitability Planner formulas →Inputs used by these formula steps
- Incremental contributionAdditional Hours
- 10
- Incremental contributionExpected Units Per Hour
- 5
- Incremental contributionContribution Per Unit
- 10
- Incremental contributionLabour Cost Per Hour
- 20
- Incremental contributionUtilities And Security Per Hour
- 5
- Incremental contributionFixed Opening Cost
- 50
Contribution per additional hour
Contribution per additional hour
incremental contribution / additional hours20/hour, ex taxResult20.00
Uses the exact shared engine result and only the entered market-neutral operating assumptions. The engine retains raw precision; display formatting does not feed calculation.
Opening Hours Profitability Planner formulas →Inputs used by these formula steps
- Contribution per additional hourAdditional Hours
- 10
- Contribution per additional hourExpected Units Per Hour
- 5
- Contribution per additional hourContribution Per Unit
- 10
- Contribution per additional hourLabour Cost Per Hour
- 20
- Contribution per additional hourUtilities And Security Per Hour
- 5
- Contribution per additional hourFixed Opening Cost
- 50
Break-even units per hour
Break-even units per hour
(additional hours × hourly operating costs + fixed opening cost) / (additional hours × contribution per unit)3 units/hourResult3 units
Uses the exact shared engine result and only the entered market-neutral operating assumptions. The engine retains raw precision; display formatting does not feed calculation.
Opening Hours Profitability Planner formulas →Inputs used by these formula steps
- Break-even units per hourAdditional Hours
- 10
- Break-even units per hourExpected Units Per Hour
- 5
- Break-even units per hourContribution Per Unit
- 10
- Break-even units per hourLabour Cost Per Hour
- 20
- Break-even units per hourUtilities And Security Per Hour
- 5
- Break-even units per hourFixed Opening Cost
- 50
Inputs used
- Additional opening hours
- 10
- Expected units per hour
- 5
- Contribution per unit
- 10
- Labour cost per hour
- 20
- Utilities and security per hour
- 5
- Fixed opening cost
- 50
Open this calculator with preset values
This calculator supports documented, shareable scenario URLs. Compatible assistants and applications can construct links using the parameters below.
Scenario links contain only allowlisted numeric and closed-choice inputs shown in the URL; Margin101 excludes free text and identifying fields. Anyone you share the URL with can read those numbers, so do not include private or identifying data.
| Parameter | Meaning | Unit | Allowed values | Presence | Default |
|---|---|---|---|---|---|
| additionalHours | Enter added hours for the decision period. | hours/period | 0 to 100000000 | Required | 10 |
| contributionPerUnit | Enter revenue less avoidable cost for each additional unit. Use one consistent ex-tax currency basis. | currency units/unit, ex tax | 0 to 10000000 | Required | 10 |
| expectedUnitsPerHour | Enter a units-per-hour scenario; this is not a forecast. | units/hour | 0 to 100000000 | Required | 5 |
| fixedOpeningCost | Enter any cost incurred once for the added opening period. Use one consistent ex-tax currency basis. | currency units/added opening period, ex tax | 0 to 10000000 | Required | 50 |
| labourCostPerHour | Enter incremental loaded labour cost for each added hour. Use one consistent ex-tax currency basis. | currency units/hour, ex tax | 0 to 10000000 | Required | 20 |
| utilitiesAndSecurityPerHour | Enter incremental premises and security cost per added hour. Use one consistent ex-tax currency basis. | currency units/hour, ex tax | 0 to 10000000 | Required | 5 |
Opening Hours Profitability: incremental revenue
Only revenue and cost caused by the changed hours belong in the decision.
Formula summary
- Primary formula
- additional units × contribution per unit − additional hours × (labour cost per hour + utilities and security per hour) − fixed opening cost.
Data used here
- The estimate uses your inputs and the general business formula documented in the methodology.
Decision checks
Stress-test the decision
Retest lower transactions, higher staffing cost and weaker contribution per sale.
When this estimate can be misleading
- Volumes, rates, capacity, time, costs and contribution are your records or scenarios; no benchmark or demand forecast is embedded.
- Keep all money and operating records on one consistent ex-tax basis and decision period.
- Incremental comparisons exclude disclosed sunk cost and do not guarantee demand, delivery capacity or a commercial outcome.
- This is educational business decision support, not accounting, tax, legal or financial advice.
- Only revenue and cost caused by the changed hours belong in the decision.
Educational estimate, not advice. See all assumptions & limitations →
Related reading
Guides to interpret the decision and its assumptions.
- Restaurant Economics: From Menu Price to Operating Profit
Trace menu price through contribution, operating capacity and period costs without confusing a dish margin with operating profit.
Read guide
Frequently asked questions
How do I test whether additional opening hours cover their incremental operating cost?
Test the smallest operating-hours change that can prove incremental demand before committing permanently.
Which planning assumptions should I stress-test?
Compare a plausible alternative scenario and verify the decision-critical assumption that changes the plan most.