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Procurement & VendorsGenerated accuracy model review: 2026-05-06
Volume Discount Calculator accuracy and testing
This page documents how Calwarden builds trust for this calculator: source notes, regression-style default tests, limitations, assumptions, unit handling, rounding, and visible change history.
Formula source
- Discounted unit price = standard unit price * (1 - discount percent / 100). Net savings = standard unit price * quantity - (discounted unit price * quantity + extra order cost).
Test cases
Default input regression check
Generated from the checked-in default inputs and calculate function.
Inputs
- Standard Unit Price: $42
- Planned Quantity: 1,200 units
- Volume Discount: 12%
- Extra Order Cost: $750
Expected outputs
- Net Volume Savings: $5,298.00
- Discounted Unit Price: $36.96
- Spend Before Discount: $50,400.00
- Discounted Spend: $45,102.00
Known limitations
- This page documents the checked-in calculator logic and does not certify results for every real-world edge case.
- Use the result as a planning estimate unless the calculator page states a stricter purpose.
Assumptions
- All prices, discounts, costs, volumes, terms, and rates are user-entered assumptions.
- Calculations are deterministic and run locally in the browser without uploading procurement data.
- Results are planning estimates and do not replace legal, accounting, tax, security, operational, or procurement review.
Unit handling
- Standard Unit Price accepts values in $.
- Planned Quantity accepts values in units.
- Volume Discount accepts values in %.
- Extra Order Cost accepts values in $.
- Net Volume Savings is displayed as currency.
- Discounted Unit Price is displayed as currency.
- Spend Before Discount is displayed as currency.
- Discounted Spend is displayed as currency.
Rounding rules
- Number displays use up to 2 decimal places in the calculator UI.
- Currency outputs are displayed with standard US dollar formatting.
- Input precision follows configured step values where provided.
Version history
1.0.0 - 2026-05-06
Generated accuracy and testing page from the current volume-discount-calculator calculator definition.
Change log
2026-05-06
Published default regression test documentation and metadata fallbacks for Volume Discount Calculator.
Calculator transparency
Accuracy pages are generated from checked-in calculator definitions and can be upgraded with curated review metadata over time.