Finance Calculator
A professional Time Value of Money (TVM) solver for loans and investments.
Finance Calculator
This multi-purpose finance calculator solves time value of money problems. Whether you need a loan payment, want to know what a lump sum will grow to, or need to find a rate — input four of the five TVM variables and it solves for the fifth.
The Five TVM Variables
- N — Number of periods (months or years)
- I/Y — Interest rate per period (annual rate ÷ periods per year)
- PV — Present Value (today's amount)
- PMT — Payment per period (regular cash flow)
- FV — Future Value (ending amount)
Enter any four and the calculator solves for the fifth.
How to Use This Calculator
- Identify which variable you want to solve for.
- Enter values for the other four variables.
- Use negative values for cash outflows (money you pay), positive for inflows (money you receive).
- Click Calculate to get your answer.
Common Use Cases
Monthly loan payment: Enter PV (loan amount), N (months), I/Y (monthly rate), FV = 0. Solve for PMT.
Investment growth: Enter PV (initial amount), PMT (monthly contribution), N (months), I/Y (monthly rate). Solve for FV.
Required rate of return: Enter PV, FV, N, PMT. Solve for I/Y.
Time to reach a goal: Enter PV, PMT, FV, I/Y. Solve for N.
Example: Loan Payment
Loan: $25,000 | Rate: 6% annual (0.5%/month) | Term: 48 months | FV = 0
- PMT = $587/month
- Total paid: $28,176 | Interest: $3,176
Common Mistakes to Avoid
- Mixing annual and monthly rates — If N is in months, I/Y must be the monthly rate (annual ÷ 12). Mismatching periods is the most common TVM error.
- Forgetting sign conventions — Cash you pay out is negative (PV of a loan = negative PMT). Inconsistent signs produce wrong answers.
- Ignoring compounding frequency — Adjust the rate to match the payment period.
Frequently Asked Questions
What is time value of money?
The principle that a dollar today is worth more than a dollar in the future, because today's dollar can be invested and grow. TVM is the foundation of all financial calculations.
What is present value?
The current value of a future amount, discounted by the expected rate of return. If you expect 7% returns, $1,000 received in 10 years is worth about $508 today.
What is future value?
The value of a current amount at a future date, given a rate of return. $1,000 invested at 7% for 10 years grows to $1,967. See our Future Value Calculator.
How does this differ from a mortgage calculator?
A mortgage calculator is pre-configured for home loans. This finance calculator is general-purpose — it can solve for any TVM variable in any financial scenario.
Conclusion
Once you understand TVM, you can analyze any financial decision — loans, investments, retirement savings, or comparing two offers. This calculator puts that power in your hands.
Related: Loan Calculator | Investment Calculator | Present Value Calculator | Future Value Calculator
Expert Advice
When solving for interest rates, the calculator uses an iterative process. If it fails to solve, ensure your signs (+/-) follow the cash flow convention correctly.
