Finance Calculator
Comprehensive finance calculator for loans, investments, and savings goals.
Finance Calculator
Comprehensive finance calculator for loans, investments, and savings goals.
Loan Payment Formula
ℹ️ Total interest paid = (M × n) – P
Disclaimer
Results provided by this calculator are for informational and educational purposes only. They are based on the values you enter and standard formulas, and should not be considered financial, medical, legal, or professional advice. Always consult a qualified professional before making important decisions based on these results. Roughtools makes no warranties regarding the accuracy or completeness of these calculations for your specific situation.
Frequently Asked Questions
Pro Tips
Even a 0.5% lower interest rate saves thousands over the life of a loan. Shop at least 3 lenders and get pre-approval before committing — lenders compete on rate when they know you have options.
Making one extra payment per year directly toward principal can shorten a 30-year mortgage by 4–6 years and save over $30,000 in interest on a typical home loan.
Your Annual Percentage Rate (APR) includes fees the interest rate does not — always compare APR, not just rate, when evaluating lender offers.
Bi-weekly payments (half the monthly amount every 2 weeks) result in 26 half-payments per year — equivalent to 13 full monthly payments instead of 12, accelerating payoff.
When to Use This Calculator
Compare dealer financing vs. bank pre-approval to find the lowest monthly payment and total cost before you sign.
Estimate monthly payments before taking out student loans to ensure they fit within your future income budget.
Calculate the cost of a business loan before applying — know your break-even point before borrowing.
Enter identical principal and term with different rates to instantly compare the true cost of competing offers.
See if consolidating multiple debts into a single lower-rate loan reduces your total monthly payment and interest.
About the Finance Calculator
This finance calculator solves for any unknown in the five-variable time value of money (TVM) equation — present value, future value, interest rate, number of periods, and payment amount. Enter four known values and solve for the fifth, making this the most versatile financial calculator for analyzing any cash flow problem. Built for finance students, business analysts, and investment professionals.
How to Use the Finance Calculator
- 1
Select the variable you want to solve for (PV, FV, Rate, Periods, or Payment).
- 2
Enter the four known values in the corresponding fields.
- 3
Choose payment timing: beginning of period (annuity due) or end of period (ordinary annuity).
- 4
See the solved value and the complete TVM equation with your inputs.
- 5
Use for loans, savings projections, investment analysis, or any financial planning scenario.
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