Simple & Compound Interest Calculator

New

Invoice Late Fee Calculator – Flat Fee & Monthly Interest

Calculate fair late fees on overdue invoices. Set a flat fee, monthly interest rate, or both, and see how much extra your client owes for paying after the due date.

Business calculator interest invoice late fee overdue

New

Auto Loan Interest Comparison – 0% vs Rebate Calculator

Compare taking a 0% financing deal versus a cash rebate with a low-interest loan. See the total cost and monthly payment for each option to make a smarter decision.

Auto calculator car loan comparison interest rebate

New

CD Ladder Calculator – Build a Certificate of Deposit Strategy

Model a CD ladder strategy by mixing CDs with different maturity lengths. See projected returns and liquidity flow to safely grow your savings while maintaining access to funds.

Calculator calculator CD interest investment ladder savings

New

APY to APR Converter – Calculate Effective Annual Rate Online

Quickly convert between Annual Percentage Yield (APY) and Annual Percentage Rate (APR) with compounding frequency. Understand the true cost of loans or real return on savings in a simple online tool.

Converter APR APY converter interest loan savings

Loan Prepayment Analyzer - Online Interest Savings Calculator

See how making extra payments reduces tenure and saves interest. Visual graph comparing original vs prepaid amortization. Purely local financial tool.

Calculator calculator interest loan prepayment

Credit Card Payoff Calculator - Online Debt Repayment Plan

Calculate how long it will take to pay off credit card debt with fixed monthly payments or a payoff goal. Understand interest costs fully.

Calculator credit card debt interest payoff