All Financial Calculators
Browse every calculator on Finance Tools. Each one is free, runs in your browser, and includes the formula and a worked example so you can understand the math behind your results.
Investing
Compound Interest Calculator
Project how your investments grow over time with monthly contributions and compound interest.
Open calculator →Monthly Investing Calculators
See how investing a fixed amount each month builds long-term wealth across different time horizons.
Open calculator →Dividend Yield Calculator
Calculate dividend yield, annual income, and monthly income from any dividend-paying stock.
Open calculator →Investment Return Calculator
Measure total return, annualized return, and profit from any investment over any time period.
Open calculator →Percentage Increase Calculator
Quickly find the percentage increase or decrease between any two values.
Open calculator →Personal Finance
Savings Goal Calculator
Find out how long it takes to reach your savings target with monthly contributions and interest.
Open calculator →Retirement Calculator
Project how much you could have saved by retirement based on your age, savings, and expected returns.
Open calculator →Inflation Calculator
See how inflation erodes purchasing power and what your money will be worth in the future.
Open calculator →Loans & Mortgages
Mortgage Payment Calculator
Estimate your monthly mortgage payment, total cost, and interest paid over the life of your loan.
Open calculator →Loan Payment Calculator
Calculate your monthly payment, total interest, and total cost for any fixed-rate loan.
Open calculator →Salary & Tax
Salary After Tax — Spain
Estimate your net salary in Spain based on gross pay, tax brackets, and social security contributions.
Open calculator →Financial Guides
How Compound Interest Works
The complete guide to how compounding builds wealth, with formulas and practical examples.
Read guide →How Retirement Savings Work
Learn how contributions, returns, and time combine to build your retirement nest egg.
Read guide →How Mortgage Payments Work
Understand amortization, principal vs. interest, and strategies to save on your loan.
Read guide →How Inflation Affects Your Money
See why holding cash loses value and what strategies protect your purchasing power.
Read guide →Savings Guides
Step-by-step plans for saving $10K, $50K, and $100K — with monthly breakdowns and timelines.
Read guides →About These Calculators
Every calculator on Finance Tools is built to give you fast, accurate results without any friction. There are no accounts to create, no data collected, and no advertisements. All calculations happen in your browser using standard, well-documented financial formulas.
Each tool includes the formula it uses, a worked example with real numbers, and a frequently asked questions section. Whether you are a beginner learning financial concepts or an experienced investor running quick scenarios, these calculators are designed to be useful, transparent, and easy to understand.
Frequently Asked Questions
Are these calculators really free?
Yes. Every calculator on this site is completely free to use with no limits. There are no premium tiers, no sign-up gates, and no hidden costs.
Is my data safe?
All calculations run entirely in your browser using JavaScript. No data is sent to any server, stored in any database, or shared with any third party. Your financial information stays on your device.
Can I use these calculators on my phone?
Yes. Every calculator is fully responsive and works on phones, tablets, and desktop computers. The layout adapts to your screen size automatically.