Our free mortgage calculator shows your monthly payment including principal, interest, taxes, and insurance (PITI). Use it alongside our home affordability calculator and rent vs buy calculator to make confident real estate decisions in 2026.

🏛️ Retirement Calculators -- 401k, Roth IRA, FIRE

Plan your retirement with our free 401k calculator (includes employer match), Roth IRA calculator, and retirement savings calculator. All updated for 2026 IRS contribution limits.

💰 Investment & Compound Interest

See the power of compounding with our compound interest calculator. Supports monthly contributions, annual compounding, and shows you an interactive growth chart. Also try our FIRE calculator for financial independence planning.

❤️ Health Calculators

Track your health goals with our free BMI calculator (CDC standards), calorie calculator, and TDEE calculator. Also includes macro calculator for protein, carbs & fat -- all based on NIH and USDA guidelines.

📊 Why Americans Trust Our Calculators

All 400+ calculators are completely free, require no signup, and run entirely in your browser. No data is ever stored or shared. Formulas follow IRS guidelines, CDC standards, and peer-reviewed financial research. Works seamlessly on mobile, tablet, and desktop.

🔄 Popular Comparisons

Roth IRA vs Traditional IRA . Rent vs Buy . Pay Off Mortgage vs Invest . HSA vs FSA . CD vs HYSA

🆓

100% Free Forever

No signup, no credit card

🔒

Private & Secure

No data stored, ever

⚡

Instant Results

Real-time calculations

📱

Works Everywhere

Mobile, tablet & desktop

Frequently Asked Questions

What is the best free mortgage calculator?

Our free mortgage calculator is one of the most comprehensive available. It calculates your monthly payment including principal, interest, property taxes, and homeowner's insurance (PMI) -- no signup required, instant results.

How do I use a 401k calculator?

Enter your current age, retirement age, current balance, monthly contribution, and employer match percentage. Our free 401k calculator uses 2026 IRS contribution limits and shows your projected balance at retirement.

What is compound interest and how is it calculated?

Compound interest is interest earned on both your principal and previously accumulated interest. The formula is: A = P(1 + r/n)^(nt). Our compound interest calculator handles this automatically and shows monthly contribution growth.

How accurate is the BMI calculator?

Our BMI calculator uses the standard CDC formula: BMI = (weight in lbs x 703) / (height in inches)2. It follows CDC and NIH adult BMI categories (Underweight, Normal, Overweight, Obese) and is accurate for adults 20+.

Are these calculators free to use?

Yes, all 400+ calculators on FinanceCalculator.com are 100% free with no signup, no registration, and no credit card required. We never store your data and there are no hidden fees.

What is the difference between Roth IRA and Traditional IRA?

Roth IRA contributions are made with after-tax dollars; withdrawals in retirement are tax-free. Traditional IRA contributions may be tax-deductible; withdrawals are taxed as ordinary income. Use our Roth vs Traditional IRA calculator to compare based on your tax situation.