Quick answer
Cash back = spending × rate ÷ 100. Spending $2,000 a month at 1.5% earns $30 a month, or $360 a year.
Enter monthly spending and the cash back rate. The calculator returns monthly and yearly cash back.
Related tools: Cash Back or Low Interest Calculator: Compare a cash rebate with a lower financing rate on a purchase. Discounted Cash Flow Calculator: Value of projected cash flows plus a terminal value. Cash on Cash Return Calculator: Annual pre-tax cash flow relative to the cash you invested.
How to use the Cash Back Calculator
- Enter spending per month ($) (0 or more).
- Enter cash back rate (%) (between 0 and 100).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Spending per month | A number, in $ | ≥ 0 |
| Cash back rate | A number, in % | ≥ 0, ≤ 100 |
Formula and method
Formula
cash back = spending × rate ÷ 100
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Monthly and annual rewards at a single flat rate.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Spending per month = 2000; Cash back rate = 1.5.
| Result | Value |
|---|---|
| Cash back per month | $30.00 |
| Per year | $360.00 |
Example 2
Inputs: Spending per month = 850; Cash back rate = 2.
| Result | Value |
|---|---|
| Cash back per month | $17.00 |
| Per year | $204.00 |
The first line is the headline result (cash back per month). Below it the cash Back Calculator lists per year, which describe the same case from other angles. IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice.
Compare cards fairly
A 2% flat card on $24,000 a year earns $480. A 1.5% card earns $360, so the 0.5% difference is worth $120 a year. An annual fee of $95 would erase most of the extra.
Tiered categories
Cards with tiered rates, such as 3% on groceries and 1% elsewhere, need separate calculations for each category. Rewards are only valuable if you pay the balance in full, since interest at 20% or more outweighs a 1.5% reward.
How the result changes with spending per month
Holding every other input at the first worked example, this table changes only spending per month. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Spending per month | Cash back per month | Per year |
|---|---|---|
| 1000 | $15.00 | $180.00 |
| 2000 | $30.00 | $360.00 |
| 4000 | $60.00 | $720.00 |
| 8000 | $120.00 | $1,440.00 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Spending per month: entering "-5" shows "Spending per month must be at least 0." beside that field and no result.
- Cash back rate: entering "101" shows "Cash back rate must be at most 100." beside that field and no result.
Choosing between the Cash Back Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Cash Back or Low Interest Calculator](/finance/cash-back-or-low-interest-calculator/) | price, down payment and cash rebate | Better choice |
| [Discounted Cash Flow Calculator](/finance/discounted-cash-flow-calculator/) | projected cash flows, discount rate and terminal growth rate | Enterprise value |
| [Cash on Cash Return Calculator](/real-estate/cash-on-cash-return-calculator/) | annual pre-tax cash flow and total cash invested | Cash-on-cash return |
| [Cash Conversion Cycle Calculator](/business/cash-conversion-cycle-calculator/) | days inventory outstanding, days sales outstanding and days payable outstanding | Cash conversion cycle |
| [Auto Loan Calculator](/finance/auto-loan-calculator/) | vehicle price, down payment and interest rate | Monthly payment |
Background: personal finance estimates
Financial calculators project from the numbers you give them. Long-range tools depend on guesses about returns and tax rates that are unlikely to hold exactly, payoff tools assume a fixed payment and rate, and tax or salary results depend on the tax year, filing status and country. Official calculators say their output is for reference only.
For decisions that matter, use conservative inputs and check the figures against your lender, plan documents or a qualified adviser.
Assumptions and limitations
- Tiered rates need to be calculated separately
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser.
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for spending per month and cash back rate to confirm this.
Frequently asked questions
Is cash back taxable?
Usually treated as a rebate, not income, but rules vary.
What if the rate changes?
Run the calculator for each rate.
Should I spend to earn rewards?
No, extra spending costs more than the reward.
What does the Cash Back Calculator calculate?
Cash back earned on card spending. It returns Cash back per month and Per year.
What formula does the Cash Back Calculator use?
cash back = spending × rate ÷ 100. Monthly and annual rewards at a single flat rate.
What do I need to enter in the cash Back Calculator?
You enter Spending per month ($) and Cash back rate (%).
How is the result rounded or limited?
IEEE-754 double precision; money shown to cents, rates to 4 decimals. Results are estimates, not financial advice. Tiered rates need to be calculated separately.
What is an example of a cash Back result?
With spending per month 2000 and cash back rate 1.5, the cash back per month is $30.00.
Can I rely on this calculator for a decision?
Results are estimates for planning, not financial advice. Lender terms, fees, taxes and rounding rules can change real figures, so confirm important numbers with your lender or a licensed adviser. For this calculator in particular: Tiered rates need to be calculated separately.
Related calculators
- Cash Back or Low Interest Calculator — Compare a cash rebate with a lower financing rate on a purchase.
- Discounted Cash Flow Calculator — Value of projected cash flows plus a terminal value.
- Cash on Cash Return Calculator — Annual pre-tax cash flow relative to the cash you invested.
- Cash Conversion Cycle Calculator — Days to turn inventory into cash.
- Auto Loan Calculator — Monthly car payment after down payment and trade-in.
- Amortization Calculator — Full amortization schedule with optional extra monthly payments.
Sources
- Standard time-value-of-money relations (e.g. Brealey, Myers & Allen, Principles of Corporate Finance)
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.