Cash Back Calculator
How to Use This Calculator
- 1
Enter Purchase Amount ($) and Cash Back Percentage (%)
Use the transaction amount and the reward rate that applies to that purchase category.
- 2
Enter Estimated Annual Spend ($) and Annual Card Fee ($)
Use annual spending eligible for the entered reward rate. Enter 0 for a no-annual-fee card.
- 3
Review the purchase and annual results
The calculator estimates rewards before fees, net annual benefit after the card fee, and the spending needed to offset a fee.
Example Calculation
A cardholder earns 3% cash back on a $75 purchase, spends $9,000 per year at that rate, and pays no annual fee.
Purchase Amount ($)
75
Cash Back Percentage (%)
3
Estimated Annual Spend ($)
9,000
Annual Card Fee ($)
0
Results
Cash Back on Purchase
$2.25
Net Cost After Rewards
$72.75
Cash Back Rate
3%
Annual Cash Back
$270.00
Net Annual Benefit
$270.00
Monthly Equivalent
$22.50
Break-Even Spend
$0
Savings Rate
0.03% (the calculator's underlying fraction, 0.03, represents 3%)
Insights card shows the reward-rate tier, annual-fee result, break-even note, and spending-level label.
Tips
A $95 annual fee needs $3,166.67 of spending at 3% to break even
Change Annual Card Fee ($) from $0 to $95 while keeping the reward rate at 3%. Compare the break-even spend with the amount you actually expect to put on the card.
At 2% rewards, $9,000 of annual spending earns $180
Change Cash Back Percentage (%) from 3 to 2 to test a standard-rate card against the current scenario.
A $5,000 annual spend at 3% earns $150 before fees
Change Estimated Annual Spend ($) to $5,000 to see whether a lower-spend year still covers an annual card fee.
What this calculator estimates
Cash back is a card reward calculated as a percentage of eligible spending. This calculator estimates rewards on one purchase and over a year, then subtracts the annual card fee from projected annual rewards; it does not include interest, reward caps, or redemption restrictions.
How the cash-back calculation works
Cash back on purchase = Purchase amount × (cash-back percentage / 100)
Net cost after rewards = Purchase amount − cash back on purchase
Annual cash back = Estimated annual spend × (cash-back percentage / 100)
Net annual benefit = Annual cash back − annual card fee
Break-even spend = Annual card fee / (cash-back percentage / 100)
For the example, the purchase earns $75 × 0.03 = $2.25. Its net cost after rewards is $75 − $2.25 = $72.75. Annual rewards are $9,000 × 0.03 = $270, and with no annual fee the modeled net annual benefit is $270.
The calculator’s Savings Rate card passes the decimal reward rate to a percent-formatted result. For a 3% input, the underlying value is 0.03, which can display as 0.03% rather than 3%. Use the Cash Back Rate card or the entered percentage when interpreting the reward rate.
Compare annual rewards with the card fee
The fee is covered when annual rewards equal the annual fee. Spending above the break-even amount produces rewards beyond the fee, before accounting for interest or other costs.
| Reward rate | Annual fee | Break-even eligible spend | Net benefit at $9,000 spend |
|---|---|---|---|
| 2% | $0 | $0 | $180 |
| 2% | $95 | $4,750 | $85 |
| 3% | $95 | $3,166.67 | $175 |
A card with a higher reward rate is not automatically better if it has a larger annual fee or if your eligible spending is low. Compare the fee against the rewards you would earn on purchases you already planned to make; spending more just to earn rewards can cost more than the reward value.
What this estimate leaves out
The calculator treats all entered annual spending as eligible at one rate. If your card pays 5% on one category, 1% on another, or limits bonus rewards, calculate each category separately or use a weighted average rate. The estimate also assumes cash rewards redeem dollar-for-dollar and does not subtract interest paid on a carried balance.
For a cardholder who pays in full, the annual fee and reward structure are the main inputs in this comparison. For someone carrying debt, compare the interest cost as well; the CFPB’s credit-card resources explain common card costs and account terms.
When to use a different calculator
- Compare cash back with a lower-interest card → Cash Back vs. Low Interest Credit Card Calculator
- Convert a reward amount into a cash-back percentage → Cashback Percentage Calculator
- Compare cash-back and travel-mile rewards → Cashback vs. Miles Card Comparison Calculator
- Measure balances against available credit → Credit Utilization Ratio Calculator
Frequently Asked Questions
How do I calculate cash back on a purchase?
Multiply the purchase amount by the reward rate expressed as a decimal. For example, a 3% rate is 0.03, so a $75 purchase earns $75 × 0.03 = $2.25 before any reward limits or exclusions.
How much annual spending is needed to offset a card fee?
Divide the annual fee by the cash-back rate as a decimal. At a 3% reward rate, a $95 fee requires $95 ÷ 0.03 = $3,166.67 in eligible annual spending just to cover the fee; spending above that creates a positive reward amount before other card costs.
Does cash back make carrying a balance worthwhile?
Usually not; interest charges can exceed rewards quickly when you carry a balance. Compare the reward value with interest and fees, and use the CFPB’s credit-card resources to review how card costs work.
Are all purchases eligible for the same cash-back rate?
No; cards can use different rates by purchase category, spending cap, merchant, or promotional period. Enter the rate that applies to the purchase or spending amount being modeled, and check the card’s terms for exclusions.
Does this calculator account for rewards caps or redemption rules?
No; it assumes every dollar entered earns the stated rate and that rewards can be redeemed at face value. A spending cap, minimum redemption amount, expiration rule, or non-cash redemption value can reduce the benefit.