True net savings
$4.00
Store B wins after travel and time.
Basket savings
$13.00
Fuel cost
$1.50
Time cost
$7.50
Quick answer: Subtract round-trip fuel cost, a dollar value for extra travel time, parking, and any membership fees from the basket savings available at the second store. If the result is positive, the trip may be worth it; if it is close to zero, gas prices or a good sale could tip it either way.
Practical guide
How to decide whether another store is worth the trip
- 1
Enter the basket savings available at the second store.
- 2
Add round-trip miles, vehicle efficiency, gas price, parking, membership, and other direct costs.
- 3
Assign a value to extra travel time and subtract every trip cost from basket savings.
Worked example
Example: Saving $18 but spending $4 on fuel and valuing 30 extra minutes at $8 leaves a net trip benefit of $6.
How to read the result
A positive net benefit means the trip may save money under your assumptions. A small result may not justify uncertainty or inconvenience.
Important limits: This is a planning estimate. Traffic, fuel use, stockouts, taxes, impulse purchases, and changing prices can alter the result.
Evergreen method
Compare usable cost, not package price
The durable comparison is price per common unit adjusted for the share you will actually use.
Formula
usable unit cost = price ÷ (quantity × usable share)Reproducible steps
- 1.Convert every option to the same unit.
- 2.Estimate the share your household will use before spoilage.
- 3.Choose the lower usable unit cost only if storage and cash flow also work.
Data note — Evergreen model: The formula works with your own inputs and does not depend on a specific price or year.
FAQ
Questions, answered
How much must I save to justify another grocery store?
More than the added fuel, time, fees, parking, and expected impulse costs. Use net savings rather than basket savings alone.
How should I value travel time?
Use a personal hourly amount that reflects what the extra time is worth to you; it is a decision input, not a wage claim.
Does this tool use live gas prices or maps?
No. Enter your own current gas price and mileage, so the calculation stays private and requires no external API.
Is it worth driving to a cheaper grocery store?
Only if your basket savings exceed the cost of fuel, extra time, and any other trip expenses. At $3.50 per gallon, a 10-mile round trip in an average car costs about $1.75 in fuel alone — enter your own numbers above to see whether the trip pays off for your household.
How do I compare grocery prices between two stores without visiting both?
Build a price book for 10 to 20 items you buy every week at your current store, then check circular ads or a quick online price check for the same items at the second store. Enter both the basket difference and your trip costs into the Multi-Store Grocery Trip Calculator above to get a net savings estimate.
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