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 →Scenario Calculators
Preset versions of the calculators above, each answering one specific question.
Compound interest scenarios
- $1,000 Invested for 10 Years: The Power of Starting Small
- $1,000/Month for 20 Years: How Compound Interest Adds $280,000 to Your Contributions
- $10,000 Invested for 10 Years: Doubling Your Money Through Compound Interest
- $100,000 Invested for 20 Years: From Six Figures to $400,000
- $100,000 Invested for 30 Years: The Third Decade Delivers the Most
- $20,000 Invested for 20 Years: Turning a Savings Milestone into $80,000
- $200,000 Invested for 30 Years: Crossing $1.6 Million Through Compound Interest
- $5,000 Invested for 20 Years: How a Modest Sum Quadruples
- $50,000 Invested for 20 Years: Crossing $200,000 Through Compound Interest
- $500,000 Invested for 30 Years: How Compounding Creates $4 Million
Monthly investing scenarios
- $1,000 a Month for 30 Years: How to Build $1.2 Million
- $1,500 a Month for 20 Years: Building $781,000 in Two Decades
- $200 a Month for 10 Years: Building Your First Investment Foundation
- $200 a Month for 20 Years: How Patience Doubles Your Money
- $2,000 a Month for 20 Years: How to Become a Millionaire in 20 Years
- $300 a Month for 20 Years: Building $156,000 on a Modest Budget
- $3,000 a Month for 30 Years: How to Build $3.6 Million
- $500 a Month for 30 Years: How to Build $610,000 on $500/Month
- $5,000 a Month for 20 Years: Building $2.6 Million in Two Decades
- $750 a Month for 20 Years: Building $390,000 in Two Decades
Savings timelines
- How Long Does It Take to Save $100,000?
- How Long Does It Take to Save $20,000?
- How Long Does It Take to Save $250,000?
- How Long Does It Take to Save $50,000?
- Saving $1,000 a Month — Timelines to $50K, $100K, and Beyond
- Saving $1,500 a Month — Fast-Track to Six Figures and Beyond
- What Does Saving $200 a Month Actually Add Up To?
- Saving $300 a Month — What You'll Have and When
- Saving $500 a Month — Timeline, Growth, and Strategy
- Saving $800 a Month — How Fast You'll Hit Major Milestones
Retirement scenarios
- How Much Do You Need to Invest to Retire?
- Retirement Calculator: Starting at Age 25
- Retirement Calculator: Starting at Age 35
- Retirement Calculator: Starting at Age 45
- Retirement Calculator: Starting at Age 55
- Retiring with $1.5 Million Saved
- Retiring with $2 Million Saved
- Retiring with $300,000 Saved
- Retiring with $500,000 at Age 60
- Retiring with $750,000 Saved
Mortgage scenarios
- How Much Is the Monthly Payment on a $350,000 Mortgage?
- How Much Is the Monthly Payment on a $450,000 Mortgage?
- Mortgage Calculator: $150,000 Home Loan
- Mortgage Calculator: $250,000 Home Loan
- Mortgage Calculator: $350,000 Home Loan
- Mortgage Calculator: $450,000 Home Loan
- Mortgage Calculator: $600,000 Home Loan
- What Does a Mortgage Cost at 3% Interest?
- What Does a Mortgage Cost at 4% Interest?
- What Does a Mortgage Cost at 8% Interest?
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.