Financial Calculators
About These Financial Calculators
These free financial calculators help you make smarter decisions with your money — whether you're planning for retirement, figuring out how much a restaurant tip should be, or watching a savings account grow through compound interest.
All calculators run entirely in your browser. Nothing you enter is sent to a server or stored anywhere.
Tools in This Category
- Compound Interest Calculator — See how a lump sum and regular contributions grow over time, with a year-by-year balance table
- Retirement Savings Calculator — Project your nest egg at retirement, see the inflation-adjusted value, and estimate monthly income using the 4% rule
- Tip Calculator — Calculate tip amount and split the bill between any number of people
Why Financial Planning Matters
Small decisions compounded over time have an outsized impact on long-term financial health. A $200/month contribution started at age 25 grows to roughly twice what the same contribution started at 35 would produce — purely from the extra decade of compounding. These tools are designed to make those numbers concrete and actionable.
How to Use These Calculators
Each calculator is designed to answer one specific question. For best results:
- Use conservative return rate assumptions for long-term projections (7% nominal for a diversified stock index is a common benchmark)
- Account for inflation — the calculators that include an inflation input will show results in today's purchasing power
- Remember that taxes and fees are not included in most projections; adjust your effective return rate downward to compensate in taxable accounts