Coupon Savings Calculator
Estimate savings after extra spending and time are considered.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
A coupon only saves money when it discounts something you planned to buy. This estimate also subtracts extra spending and the value of time spent organizing coupons.
Worked example
calculated with the default values below
Items with coupons per trip 8 · Average saving per coupon 1.25 $ · Shopping trips per month 4 · Extra unplanned spending per trip 6 $ · Minutes spent organising coupons 20 min · Value of your time 20 $/h Coupon saving per trip 10.00 $ · Net saving per trip after extra spend 4.00 $ · Net saving per month 16.00 $ · Net saving per year 192.00 $ · Value of time spent 320 $ · True saving after valuing your time -128 $
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
A = 12 × t × (n × s − x) − 12 × t × (m ÷ 60) × v
- t
- Trips per month
- n
- Items per trip
- s
- Average saving per item
- x
- Extra spend per trip
- m
- Minutes per trip
- v
- Value of your time per hour
Annual net savings = (items × saving per coupon − extra spend per trip) × trips per month × 12 − (minutes per trip ÷ 60 × hourly time value × trips per month × 12).
Frequently asked questions
How is the time cost applied?
The model subtracts unplanned spending from coupon discounts for each shopping trip, annualizes by trips per month, then subtracts the yearly value of the time spent organizing coupons. It is an estimate: enter only discounts you actually redeem and extra spending caused by coupon use.