Finance Calculator

Using any of the calculators on this page is straightforward. Each section is dedicated to a specific type of financial calculation, so start by identifying what you want to figure out. Are you comparing loan options? Projecting investment growth? Planning for retirement? Go to that section directly.

Once you're there, you'll see labeled input fields. Fill in the values you know, and the calculator does the rest. A few tips to keep things smooth:

• Enter interest rates as percentages (for example, type 5 for 5%, not 0.05)
• Use whole numbers for years and months where asked
• Double-check that your starting values are accurate before reading results
• If a field has a default value, you can leave it or override it with your own

Results update automatically or after you hit a calculate button, depending on the tool. If a number looks off, revisit your inputs first. Small differences in rate or term can shift results significantly, which is actually useful for comparison shopping.

This calculator helps you find your monthly payment on any fixed-rate loan, whether it's a mortgage, car loan, personal loan, or student loan. You input three things: the loan amount (principal), the annual interest rate, and the loan term in months or years. The calculator gives you the monthly payment, total amount paid over the life of the loan, and total interest paid.

That total interest figure is the one most people overlook. On a long-term loan, you can easily pay back far more than you originally borrowed. Seeing that number upfront helps you decide whether a shorter term or a larger down payment makes sense.

The formula behind it is the standard amortization equation, which spreads both principal and interest evenly across every payment. Early payments are weighted more toward interest, and later payments chip away more at the principal. This is why paying a little extra each month early on can reduce your total interest substantially.

This tool projects how much your money will grow over time based on an initial deposit, regular contributions, an expected rate of return, and a time horizon. It's useful for everything from a basic savings account to a brokerage portfolio.

You can model two scenarios side by side: saving a lump sum with no additional contributions, or making consistent monthly or annual deposits on top of a starting balance. Most people fall somewhere in between, and tweaking those contribution amounts shows you exactly how much more (or less) you'll end up with.

A few things worth keeping in mind when using this calculator:

• Rate of return: Use a realistic figure. Historical stock market averages hover around 7–10% annually before inflation, but past performance never guarantees future results.
• Contribution frequency: Monthly contributions compound more often than annual ones, which slightly boosts the final number.
• Inflation: The calculator shows nominal growth. Real purchasing power will be lower depending on inflation over your time horizon.

Even modest, consistent contributions add up over time in ways that are genuinely surprising when you run the numbers.

Compound interest is interest calculated on both your original principal and the interest you've already earned. That compounding effect is what separates long-term wealth building from simply stashing cash under a mattress.

This calculator lets you set your principal, annual interest rate, compounding frequency (daily, monthly, quarterly, or annually), and time period. The result shows your ending balance and how much of it came from interest alone.

Compounding frequency matters more than most people realize. Here's a quick comparison using $10,000 at 6% for 10 years:

The differences might look small over 10 years, but they scale up considerably with larger balances and longer time periods. When you're choosing between savings accounts or investment accounts, compounding frequency is worth checking.

These two calculations are essentially two sides of the same coin. Future value (FV) tells you what a sum of money today will be worth at some point down the road, given a rate of return. Present value (PV) works backward: it tells you what a future sum is worth in today's dollars, after accounting for the time value of money.

Future value is useful when you're saving or investing and want to project an end goal. Present value is useful when you're evaluating a future payment or benefit and want to understand what it's actually worth right now.

For example, if someone offers you $15,000 five years from now, and you could otherwise invest that money at 6% annually, the present value of that future payment is roughly $11,209. That's the equivalent amount today. Comparing PV to what you'd have to give up helps you make smarter decisions about lump-sum offers, annuities, or deferred payments.

Both calculations use your discount rate (or expected rate of return) as the key variable. Changing that rate even slightly shifts the result, so it's worth running a few scenarios rather than relying on a single estimate.

Retirement planning comes down to one central question: will you have enough? This calculator helps you estimate how much you need to save by the time you retire, how long your savings will last, or what monthly contribution gets you to your target.

You'll enter details like your current age, expected retirement age, current savings balance, monthly contribution, expected rate of return during the savings phase, and estimated annual spending in retirement. The calculator projects your balance at retirement and estimates how many years it will sustain your withdrawals.

A few inputs that have an outsized effect on results:

• Retirement age: Working a few extra years both adds to your savings and shortens the withdrawal period, which has a compounding benefit on sustainability.
• Withdrawal rate: The commonly cited 4% rule suggests withdrawing 4% of your balance per year in retirement. This calculator lets you test different rates.
• Rate of return: Pre-retirement returns and post-retirement returns often differ. Many planners use a more conservative return assumption once withdrawals begin.

No calculator can predict the future, and factors like Social Security income, healthcare costs, and market volatility all play a role. But running these numbers gives you a concrete baseline to work from and a clear sense of where adjustments would have the most impact.

Every calculator on this page uses established financial formulas. Here's a reference for the core ones, in case you want to understand the math or run calculations manually.

Monthly Loan Payment (Amortization Formula):
M = P × [r(1+r)^n] / [(1+r)^n - 1]
Where P = principal, r = monthly interest rate (annual rate ÷ 12), n = total number of payments.

Future Value (FV):
FV = PV × (1 + r)^n
Where PV = present value, r = rate per period, n = number of periods.

Present Value (PV):
PV = FV / (1 + r)^n

Compound Interest:
A = P × (1 + r/n)^(nt)
Where P = principal, r = annual rate, n = compounding periods per year, t = years.

Future Value of an Annuity (regular contributions):
FV = PMT × [((1 + r)^n - 1) / r]
Where PMT = payment per period, r = rate per period, n = number of periods.

These formulas assume a fixed rate, which is a simplification of real-world conditions. But they're the standard starting point used in financial planning, banking, and investment analysis worldwide.

Seeing the formulas in action makes them a lot easier to work with. Here are a few practical examples that mirror common real-life situations.

Example 1: Car Loan Payment
You borrow $25,000 for a car at 5.5% annual interest over 60 months. The monthly rate is 5.5% ÷ 12 = 0.4583%. Plugging into the amortization formula gives a monthly payment of about $478.32. Over 60 months, you'll pay roughly $28,699 total, meaning about $3,699 in interest.

Example 2: Savings Growth
You put $5,000 in a savings account earning 4% annually, compounded monthly, and add $200 per month for 10 years. At the end of 10 years, your balance would be approximately $37,100. You contributed $29,000 out of pocket; the rest is interest.

Example 3: Retirement Target
You're 35, want to retire at 65, and estimate you'll need $50,000 per year in retirement. Assuming a 4% withdrawal rate, you'd need a nest egg of $1,250,000 (50,000 ÷ 0.04). Working backward with a 7% annual return, you'd need to save roughly $1,200 per month from age 35 to hit that target, assuming no existing savings.

These examples are simplified, but they show how small changes in rate, time, or contributions can significantly move the final number. That's exactly why running your own numbers, with your actual situation, is worth doing before making any major financial decision.