Shopping Savings Calculator
Total your savings on a shopping trip from sale prices, quantities, basket coupons and cashback.
Your inputs
Results
Total saved
$16.31
- Saved vs regular prices
- 29.2%
- Regular total
- $55.85
- Paid at checkout
- $40.35
- Net cost after cashback
- $39.54
✓Exact calculation — rounded only for display
| Item | Regular | Paid | Saved |
|---|---|---|---|
| Coffee | $25.98 | $19.98 | $6.00 |
| Detergent | $15.50 | $11.00 | $4.50 |
| Cereal | $14.37 | $14.37 | $0.00 |
What this calculator does
List items with regular and paid prices to see the real saving after coupons and cashback.
Formula and method
Saved = Σ regular × qty − (Σ paid × qty − coupon) × (1 − cashback %)
Worked example
Calculated by this tool with its default inputs:
Inputs
- Items — one per line: name, regular price, price paid, quantity: Coffee, 12.99, 9.99, 2 Detergent, 15.50, 11.00, 1 Cereal, 4.79, 4.79, 3
- Basket coupon / voucher: 5 (any currency)
- Cashback / rewards rate: 2 %
Results
- Total saved: 16.31
- Saved vs regular prices: 29.2%
- Regular total: 55.85
- Paid at checkout: 40.35
- Net cost after cashback: 39.54
How to read the results
Savings only count if you would have bought the items anyway.
Assumptions and limitations
- Cashback is applied to the amount paid after coupons.
Questions
Should I include items not on sale?
Yes — enter the same regular and paid price so the totals are complete.
Methodology and verification
- Result type
- Exact mathematical calculation (rounded only for display)
- Formula version
- 1.0
- Automated verification
- 2 reference and validation test cases, checked against independently computed values. The site cannot be built if any of them fail.
- Editorial review
- Awaiting human editorial review. The explanation was drafted with AI assistance; the formula and examples are verified by the automated tests above.
Privacy
Everything you enter is calculated in this browser and is not sent to Numerith or anyone else. Inputs are added to a share link only if you choose to include them. Privacy policy