Act on the result
Use the result to define a change request or tighter scope boundary.
Educational only: Business decision support, not accounting, tax or legal advice.
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Scope: Market-neutral small-business planning using your own assumptions.
What this planner helps you decide
Best for
Project owners measuring the commercial effect of work beyond scope.
Outputs
Extra hours, extra cost, recovered revenue and contribution erosion.
Start here
Compare contracted hours with actual or expected delivery hours.
Use a different tool when: Do not use this to set a minimum project fee; use Minimum Project Fee Planner for that decision. Use this tool to measure unrecovered scope change.
Quote & capacity
Scope Creep Impact: extra hours
Extra hours, extra cost, recovered revenue and contribution erosion.
Amounts use the same currency as your inputs. No currency conversion is performed.
Scope Creep Impact
Measure contribution erosion from extra project hours.
Your numbers stay in this browser
Original project fee.
Hours included in scope.
Expected or recorded hours.
Internal hourly cost.
Revenue recovered per extra hour.
Decision result
Every result is derived by the registered service and project engine.
PDF and CSV exports stay on this device. Clean page links contain no inputs.
- Extra Hours
- 15 hours/project
- Extra Delivery Cost
- 1,200.00/project
- Recoverable Revenue
- 750.00/project
- Quoted Contribution
- 6,000.00/project
- Actual Contribution
- 5,550.00/project
- Contribution erosion
- 450.00/project
- Actual Effective Rate
- 165.38/hour
Scenario comparison
Each row names the assumption axis changed from the baseline.
ScenarioResultDifference
Current scenario450.00/projectBaseline
Lower Actual hours352.50/project−97.50/project (−21.7%)
Higher Actual hours547.50/project+97.50/project (+21.7%)
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.
Contribution erosion
Contribution Erosion
quoted contribution − actual contribution450/projectResult450.00/project
Reports/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Contribution ErosionContracted Revenue
- 10,000
- Contribution ErosionQuoted Hours
- 50
- Contribution ErosionActual Hours
- 65
- Contribution ErosionDelivery Cost Per Hour
- 80
- Contribution ErosionRecoverable Extra Rate
- 50
Extra Hours
Extra Hours
actual hours − quoted hours15 hours/projectResult15 hours/project
Reports hours/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Extra HoursContracted Revenue
- 10,000
- Extra HoursQuoted Hours
- 50
- Extra HoursActual Hours
- 65
- Extra HoursDelivery Cost Per Hour
- 80
- Extra HoursRecoverable Extra Rate
- 50
Extra Delivery Cost
Extra Delivery Cost
extra hours × delivery cost per hour1,200/projectResult1,200.00/project
Reports/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Extra Delivery CostContracted Revenue
- 10,000
- Extra Delivery CostQuoted Hours
- 50
- Extra Delivery CostActual Hours
- 65
- Extra Delivery CostDelivery Cost Per Hour
- 80
- Extra Delivery CostRecoverable Extra Rate
- 50
Recoverable Revenue
Recoverable Revenue
extra hours × recoverable extra rate750/projectResult750.00/project
Reports/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Recoverable RevenueContracted Revenue
- 10,000
- Recoverable RevenueQuoted Hours
- 50
- Recoverable RevenueActual Hours
- 65
- Recoverable RevenueDelivery Cost Per Hour
- 80
- Recoverable RevenueRecoverable Extra Rate
- 50
Quoted Contribution
Quoted Contribution
contracted revenue − quoted delivery cost6,000/projectResult6,000.00/project
Reports/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Quoted ContributionContracted Revenue
- 10,000
- Quoted ContributionQuoted Hours
- 50
- Quoted ContributionActual Hours
- 65
- Quoted ContributionDelivery Cost Per Hour
- 80
- Quoted ContributionRecoverable Extra Rate
- 50
Actual Contribution
Actual Contribution
contracted revenue + recovered revenue − actual delivery cost5,550/projectResult5,550.00/project
Reports/project from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Actual ContributionContracted Revenue
- 10,000
- Actual ContributionQuoted Hours
- 50
- Actual ContributionActual Hours
- 65
- Actual ContributionDelivery Cost Per Hour
- 80
- Actual ContributionRecoverable Extra Rate
- 50
Actual Effective Rate
Actual Effective Rate
total recovered revenue ÷ actual hours165.38/hourResult165.38/hour
Reports/hour from the entered project, capacity and ex-tax commercial assumptions. The engine retains full precision; presentation is bounded for readability.
Scope Creep Impact Planner formulas →Inputs used by these formula steps
- Actual Effective RateContracted Revenue
- 10,000
- Actual Effective RateQuoted Hours
- 50
- Actual Effective RateActual Hours
- 65
- Actual Effective RateDelivery Cost Per Hour
- 80
- Actual Effective RateRecoverable Extra Rate
- 50
Inputs used
- Contracted revenue
- 10,000
- Quoted hours
- 50
- Actual hours
- 65
- Delivery cost per hour
- 80
- Recoverable extra-hour rate
- 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 |
|---|---|---|---|---|---|
| actualHours | Expected or recorded hours. | hours/project | 0 to 10000000 | Required | 65 |
| contractedRevenue | Original project fee. | currency units/project | 0 to 10000000 | Required | 10000 |
| deliveryCostPerHour | Internal hourly cost. | currency units/hour | 0 to 10000000 | Required | 80 |
| quotedHours | Hours included in scope. | hours/project | 0 to 10000000 | Required | 50 |
| recoverableExtraRate | Revenue recovered per extra hour. | currency units/hour | 0 to 10000000 | Required | 50 |
Scope Creep Impact: extra hours
The scope creep impact result uses only the entered commercial assumptions.
Formula summary
- Primary formula
- contribution erosion = quoted contribution − actual contribution
Data used here
- The estimate uses your inputs and the general business formula documented in the methodology.
Decision checks
Stress-test the decision
Retest with no extra-hour recovery and a higher delivery cost.
When this estimate can be misleading
- Results depend on the accuracy and consistent basis of user-entered assumptions.
- The planner does not forecast demand, delivery performance or contract outcomes.
- Use the result as educational business decision support, not accounting, tax or legal advice.
- The scope creep impact result uses only the entered commercial assumptions.
Educational estimate, not advice. See all assumptions & limitations →
Related reading
Guides to interpret the decision and its assumptions.
- Scope Change Quote Checklist
Record and cost added work, compare absorb, partial-charge and full re-quote paths, then stop for approval.
Read guide
Frequently asked questions
How do I measure unrecovered scope change?
Use the result to define a change request or tighter scope boundary.
Which planning assumptions should I stress-test?
Compare a plausible alternative scenario and verify the decision-critical assumption that changes the plan most.