Fuel Card Discount Calculator Guide
Gas rewards credit cards can meaningfully cut your fuel expenses, but the actual savings depend on your monthly gas spend, the discount rate, and any monthly caps or minimum spend requirements. This calculator lets you input your monthly fuel volume, local gas price, card discount rate, and any per-month discount cap to see your real monthly and annual savings. If your card has an annual fee, enter it to instantly see your net benefit after the fee. Use this to compare multiple cards side by side and choose the one that saves you the most.
Formula
Monthly savings = min(monthly gas spend × discount rate, monthly cap) | Annual savings = monthly savings × 12
Frequently Asked Questions
Most gas rewards cards offer 2–5% cash back at gas stations. Some premium travel cards offer higher rates but may have higher annual fees.
Divide the cents-per-gallon discount by the current gas price. For example, $0.05/gal at $3.50/gal = 1.4% discount.
Some cards require a minimum monthly spend to activate the higher reward tier. If you don't meet it in a given month, use the lower tier rate for that month's estimate.