Act on the result
Adopt the rounded price only after comparing the contribution effect with customer and operational benefits.
Educational only: Business decision support, not accounting, tax or legal advice.
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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
Owners deciding whether a rounded price point materially changes contribution.
Outputs
Price change, contribution per unit and period contribution difference.
Start here
Compare the current and rounded ex-tax prices at one explicit expected volume.
Use a different tool when: Do not use this to set a profitable order floor; use Minimum Order Value Planner for that decision. Use this tool to choose a rounded price point.
Price & margin
Price Point Rounding Impact: price change
Price change, contribution per unit and period contribution difference.
Amounts use the same currency as your inputs. No currency conversion is performed.
Price Point Rounding Impact
Measure the contribution effect of a rounded price.
Your numbers stay in this browser
Current ex-tax price.
Price point to test.
Cost per unit.
Units at the tested price.
Decision result
Every result is derived by the registered pricing engine.
PDF and CSV exports stay on this device. Clean page links contain no inputs.
- Contribution change
- 500.00
- Price Change Ex Tax
- 0.50
- Price Change Rate
- 0.5%
- Rounded Contribution Ex Tax
- 45,000.00
Scenario comparison
Each row names the assumption axis changed from the baseline.
ScenarioResultDifference
Current scenario500.00Baseline
Lower Rounded price-4,500.00-5,000.00
Higher Rounded price5,500.005,000.00
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.
Contribution change
Contribution Delta Ex Tax
rounded contribution − current contribution500 , ex taxResult500.00
Uses the entered assumptions on one consistent ex-tax commercial basis. The engine retains full precision; presentation is bounded for readability.
Price Point Rounding Impact Planner formulas →Inputs used by these formula steps
- Contribution Delta Ex TaxCurrent Price Ex Tax
- 99.5
- Contribution Delta Ex TaxRounded Price Ex Tax
- 100
- Contribution Delta Ex TaxUnit Variable Cost Ex Tax
- 55
- Contribution Delta Ex TaxExpected Units
- 1,000
Price Change Ex Tax
Price Change Ex Tax
rounded price − current price0.50 , ex taxResult0.50
Uses the entered assumptions on one consistent ex-tax commercial basis. The engine retains full precision; presentation is bounded for readability.
Price Point Rounding Impact Planner formulas →Inputs used by these formula steps
- Price Change Ex TaxCurrent Price Ex Tax
- 99.5
- Price Change Ex TaxRounded Price Ex Tax
- 100
- Price Change Ex TaxUnit Variable Cost Ex Tax
- 55
- Price Change Ex TaxExpected Units
- 1,000
Price Change Rate
Price Change Rate
rounded price ÷ current price − 10.5%Result0.5%
Uses the entered assumptions on one consistent ex-tax commercial basis. The engine retains full precision; presentation is bounded for readability.
Price Point Rounding Impact Planner formulas →Inputs used by these formula steps
- Price Change RateCurrent Price Ex Tax
- 99.5
- Price Change RateRounded Price Ex Tax
- 100
- Price Change RateUnit Variable Cost Ex Tax
- 55
- Price Change RateExpected Units
- 1,000
Rounded Contribution Ex Tax
Rounded Contribution Ex Tax
(rounded price − unit variable cost) × expected units45,000 , ex taxResult45,000.00
Uses the entered assumptions on one consistent ex-tax commercial basis. The engine retains full precision; presentation is bounded for readability.
Price Point Rounding Impact Planner formulas →Inputs used by these formula steps
- Rounded Contribution Ex TaxCurrent Price Ex Tax
- 99.5
- Rounded Contribution Ex TaxRounded Price Ex Tax
- 100
- Rounded Contribution Ex TaxUnit Variable Cost Ex Tax
- 55
- Rounded Contribution Ex TaxExpected Units
- 1,000
Inputs used
- Current price
- 99.5
- Rounded price
- 100
- Variable cost
- 55
- Expected units
- 1,000
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 |
|---|---|---|---|---|---|
| currentPriceExTax | Current ex-tax price. | currency units/product unit, ex tax | 0 to 10000000 | Required | 99.5 |
| expectedUnits | Units at the tested price. | whole product units/comparison period | 0 to 10000000 | Required | 1000 |
| roundedPriceExTax | Price point to test. | currency units/product unit, ex tax | 0 to 10000000 | Required | 100 |
| unitVariableCostExTax | Cost per unit. | currency units/product unit, ex tax | 0 to 10000000 | Required | 55 |
Price Point Rounding Impact: price change
The period contribution change measures the exact commercial effect of moving to the rounded price point.
Formula summary
- Primary formula
- contribution change = (rounded price − current price) × units
Data used here
- The estimate uses your inputs and the general business formula documented in the methodology.
Decision checks
Stress-test the decision
Test the rounded price at lower expected volume if demand response is uncertain.
When this estimate can be misleading
- Results depend on the accuracy and consistent basis of your inputs.
- The planner does not predict demand, competitor behaviour or supplier terms.
- Use the result as educational business decision support, not accounting, tax or legal advice.
- The period contribution change measures the exact commercial effect of moving to the rounded price point.
Educational estimate, not advice. See all assumptions & limitations →
Related reading
Guides to interpret the decision and its assumptions.
- Small-Business Pricing: A Decision Framework
Build a price from costs and contribution, then test margin, volume, capacity and customer-value assumptions in a clear decision sequence.
Read guide
Frequently asked questions
How do I choose a rounded price point?
Adopt the rounded price only after comparing the contribution effect with customer and operational benefits.
Which planning assumptions should I stress-test?
Compare a plausible alternative scenario and verify the decision-critical assumption that changes the plan most.