Financial & interest calculators
Understand your money, one calculation at a time.
Clear, accurate money calculators — from your first budget to early retirement.
Level 1
Basics
Start here. The core ideas behind every money decision.
- Budget & Emergency FundWhere should my paycheck go?Split your pay into needs, wants and savings — and plan a safety net.
- Simple InterestHow much interest will I pay or earn on a fixed amount?The easiest kind of interest: a set percentage of the original amount.
- InflationWhat will things cost in the future?See how rising prices shrink what your money can buy.
- Interest Rates ExplainedWhat does this interest rate really mean?APR vs. APY, plus how fast money doubles (the Rule of 72).
Level 2
Building Wealth
See how saving and investing grow your money over time.
- Compound InterestHow much will my money grow if I keep saving?See how saving a little every month can grow into a lot.
- Savings GoalHow much do I need to save to reach my goal?Turn a goal into a monthly savings amount — or a finish date.
- Investment ReturnHow well did my investment actually do each year?Turn a start and end value into a simple yearly growth rate.
Level 3
Debt & Borrowing
Find out what borrowing really costs — and how to get out of debt faster.
- Loan PaymentWhat will my loan cost each month — and in total?Your monthly payment, total interest and payoff date for any loan.
- MortgageHow much will a home really cost me each month?Your full monthly home payment — not just the loan.
- Debt Payoff PlanHow long until I'm debt-free?A step-by-step plan to pay off credit cards and other debts.
Level 4
Long Game
Plan for the day you can stop working.