Cash Back Calculator
Estimate cash-back rewards from spending and a reward rate, net of an annual fee, and see your effective return. Includes a worked example with and without a fee.
Results · USD
Gross rewards
Net after fee
- Effective cash-back
- 2%
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Educational estimates · not financial advice · free, no signup
How this was calculated
Rewards = spend × (rate%/100). Net = rewards − annual fee. Effective % = net ÷ spend × 100.
Want more detail? Full formula notes & FAQs ↓
Detailed guide
What it is, how to use it, how to read the numbers, common mistakes, a worked example, formulas, and FAQs.
What this calculator is
A card that pays 2% back sounds simple, but the real value depends on how much you spend, whether the rate applies to all purchases, and whether an annual fee eats into the rewards. This calculator multiplies your spending by the cash-back rate, subtracts the annual fee, and shows the effective percentage you keep. It is a quick way to compare a no-fee card against a premium card, or to find out how much you need to spend for a fee to pay off. Use a blended rate if your card pays different rates in different categories. Rewards also depend on caps, redemption methods and interest costs if you carry a balance, which are not modelled.
When to use / who it helps
- You are comparing two reward cards.
- You want to know if an annual fee is worth paying.
- You want to estimate yearly rewards from typical spending.
- You want a blended effective rate across categories.
- You are deciding how much to put on a card.
How to use
Steps
- Enter your annual spending that earns rewards.
- Enter the cash-back rate as a percentage; use a blended rate if categories differ.
- Enter the annual fee, or 0 for no-fee cards.
- Read gross rewards and net rewards.
- Check the effective cash-back percentage.
- Compare cards by repeating with each card's numbers.
How to interpret results
- Gross rewards ignore the fee, while net rewards subtract it.
- A fee has a larger effect on the effective rate when spending is lower.
- The effective rate is net rewards divided by spending.
- Interest charged on unpaid balances can erase rewards.
- Caps and category rules can lower the real rate.
Common mistakes & gotchas
- Using the headline rate when most spending earns a lower rate.
- Ignoring the annual fee.
- Carrying a balance, where interest exceeds the rewards.
- Overspending to earn rewards.
- Forgetting that points may be worth less than cash.
Worked example
Worked example — $12,000 a year at 2%
- Gross rewards: 12,000 × 0.02 = $240.
- With no fee, net rewards are $240 and the effective rate is 2.0%.
- With a $95 annual fee, net rewards are 240 − 95 = $145.
- Effective rate with the fee: 145 ÷ 12,000 = 1.21%.
Result: A no-fee card earns $240 (2.0%); the same rewards with a $95 fee leave $145, or 1.21%.
To load the form's own demo values, tap Try example above the Calculate button.
How to calculate / formula
Rewards = spend × (rate%/100). Net = rewards − annual fee. Effective % = net ÷ spend × 100.
Frequently asked questions
How is cash back calculated?
Multiply eligible spending by the cash-back rate.
Is an annual fee worth it?
Only if the extra net rewards exceed the cost compared with a no-fee alternative.
What if my card has category rates?
Estimate spending in each category and enter a blended rate.
Do rewards include interest costs?
No. Interest on unpaid balances usually exceeds typical rewards.
Are cash-back rewards taxable?
Rules vary. In some places they are treated as rebates and not income.
How much should I spend to cover a fee?
Divide the fee by the cash-back rate. A $95 fee at 2% needs $4,750 of spending to break even.