Cash Back Calculator
Monthly spending of $600 at 3%, $200 at 2%, and $1,200 at 1% produces an estimated $34 in gross cash back. This calculator applies the rate entered for each category, totals rewards, and finds the blended rate across spending. Monthly input is multiplied by 12 for an annualized pace, while annual input is divided by 12 for a monthly equivalent. The estimate assumes every entered dollar qualifies and does not automatically apply caps, exclusions, fees, interest, redemption rules, or changing categories.
Quick answer
Cash back for each category equals spending x cash-back rate.
Category 1
Category 2
Category 3
Enter spending for the period you selected above. This estimate does not include spending caps, rotating-category activation, annual fees, balance interest, or point redemptions at different values.
What this tells you
- •Cash back for each category equals spending x cash-back rate.
- •Total cash back equals the sum of all category rewards.
- •Your effective cash-back rate equals total cash back divided by total spend.
- •If you enter monthly spending, the calculator also annualizes the result by multiplying by 12.
- •Annual input stays annual and is divided by 12 for the monthly equivalent.
- •The top category is the row producing the most reward dollars, not necessarily the highest rate.
- •Rates may be zero, but every category must contain positive spending.
- •All monetary outputs and the effective rate are rounded to 2 decimal places.
How to Use
- 1Choose monthly or annual and keep every category amount on that same time basis.
- 2Enter positive eligible spending and the actual reward rate for each category.
- 3Split spending above a reward cap into another row at the fallback rate.
- 4Use a 0% row for transactions that count toward spend but earn no cash back.
- 5Calculate gross rewards, blended rate, annualized amount, monthly equivalent, and top reward category.
- 6Subtract annual fees and other costs separately before comparing net card value.
How It Works
Formula
Cash back by category = spending x (cash-back rate ÷ 100)
Total cash back = sum of category cash back
Effective cash-back rate = (total cash back ÷ total spend) x 100
Annualized cash back from monthly spending = monthly cash back x 12For each row, the calculator divides the percentage by 100 and multiplies by spend. It adds all spend and all rewards, then divides rewards by spend and multiplies by 100 for the effective rate. In the $600, $200, and $1,200 example, rewards are $18, $4, and $12. Total rewards are $34 on $2,000, so the blended rate is 1.70%. Because the period is monthly, annualized rewards are $34 x 12 = $408. This annualization assumes the same spend and rates repeat every month.
Calculation note: values are processed in the order shown above, using the current input units.
Worked Examples
Three-category monthly rewards mix
Groceries earn $18, gas earns $4, and everything else earns $12. That adds up to $34 on $2,000 of spend. Over 12 similar months, that pace would equal $408 in annual cash back.
Flat 2% card on annual spend
A flat-rate card is simple because every dollar earns the same rate. Multiply $24,000 by 0.02 to get $480 for the year, which works out to $40 per month on average.
Capped category split into two rates
The bonus portion earns $25 and the remaining spend earns $15. Splitting the rows manually represents a cap or fallback rate that the calculator does not apply on its own.
Annual categories with equal reward dollars
Each row earns $180, for $360 on $18,000. When categories tie for top reward dollars, the implementation keeps the first matching row as the top category.
Eligible and excluded monthly spend
Eligible spend earns $20 and excluded spend earns zero. Dividing $20 by all $1,300 entered gives an effective rate of 1.5385%, displayed as 1.54%.
What common cash-back rates earn on $1,000 of spend
Quick reward estimates for one spending category before any caps, fees, or point-value adjustments.
| Cash-back rate | Cash back on $1,000 | Cash back on $2,500 |
|---|---|---|
| 1% | $10 | $25 |
| 1.5% | $15 | $37.50 |
| 2% | $20 | $50 |
| 3% | $30 | $75 |
| 5% | $50 | $125 |
The dollar reward scales in a straight line as long as the full spend qualifies for that rate.
Gross rewards versus net card value
Gross cash back is the reward before annual fees, interest, late fees, redemption losses, and spending that fails to qualify. A card showing more gross rewards can still have lower net value after costs.
Caps require manual rows. If only the first $500 earns 5% and the next $1,500 earns 1%, enter those portions separately. Applying 5% to the full $2,000 would overstate rewards.
Annualizing a monthly result assumes the month repeats 12 times. Seasonal spending, rotating categories, promotions, and changing issuer terms can make actual annual rewards different.
Common mistakes
- Using one average reward rate when your card actually pays different percentages by category
- Counting the full category spend at 5% when the card has a quarterly or annual spending cap
- Comparing reward dollars without subtracting annual fees or checking whether interest charges wipe them out
- Entering annual spend in one row and monthly spend in another while using one shared period setting
- Treating a sign-up bonus as a permanent cash-back rate
- Assuming the highest percentage row always produces the most reward dollars
- Spending more than planned solely to earn rewards, which can cost far more than the cash back
Limitations
This calculator assumes every entered dollar earns its entered rate for the selected period. It does not verify merchant coding or model caps, activation requirements, rotating categories, issuer exclusions, returned purchases, statement credits, reward expiration, redemption minimums, point values, sign-up bonuses, taxes, annual fees, foreign-transaction fees, interest, late fees, or changes to program terms. Annualization assumes identical monthly spending for 12 months. It estimates gross rewards, not account profitability or affordability.
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