What the future value calculator does
This future value calculator, sometimes shortened to an fv calculator, shows you what a sum of money will be worth down the road, once interest has had time to work. You enter what you have now, the rate you expect to earn, and how long you'll leave it alone. The tool above runs the math and hands you a number you can plan around. It's a simple way to picture how today's dollars turn into tomorrow's balance.
Enter your starting amount
Type in the money you're starting with, also called the present value. Starting from scratch? Leave it at $0 and let your deposits do the work.
Add a regular deposit (optional)
Planning to put money in each month or year? Enter that amount here. Skip it if you're investing a single lump sum.
Set your interest rate
Put in the annual rate you expect to earn, written as a percent like 6%. Use a number you'd realistically get, not a best case.
Choose how long
Enter the number of years you'll keep the money invested. Time is the biggest lever you have, so this one counts.
Pick the compounding frequency
Choose how often interest gets added back in: yearly, monthly, or daily. The more often it compounds, the slightly higher your result.
How the math works
Compound interest grows your money on top of money it already earned. The formula behind it is Future Value = Present Value × (1 + r) raised to n, where r is your rate per period and n is the number of periods.
Here's a real example. Say you put in $10,000 today at 6% a year, compounded yearly, and leave it for 20 years. Each year your balance earns 6%, then the next year earns 6% on the bigger number. After 20 years it grows to about $32,071, and $22,071 of that is pure interest you never deposited. That snowball is the whole point.
What moves your number the most
A handful of things decide how big your future value gets.
Time does the heavy lifting. Money left for 30 years can dwarf the same amount pulled out at 10, because the late years compound on the largest balance.
Your rate matters, but be honest about it. A savings account paying 4% and a stock fund averaging 8% lead to very different places, and the higher return usually comes with more ups and downs.
Regular deposits stack up fast. Adding even $100 a month, every month, often contributes more to your final balance than your starting amount did.
Inflation and taxes quietly shrink the result. Inflation lowers what your future dollars can buy, and taxes can take a cut of your gains. Rules vary by account and situation, so check with your bank or a tax pro on how they hit you.
Tips to get a number you can trust
Use a rate you'd actually expect, not the best year you've ever seen. It's better to be surprised on the upside.
Run it a few times with different rates, like 4%, 6%, and 8%, so you see a range instead of one guess.
Add your monthly deposit if you make one. Steady contributions usually matter more than chasing a higher rate.
Think in today's money. If you care about spending power, knock a couple percent off your rate to roughly account for inflation.
Recheck once a year. Your real balance, rate, and goals shift, and the calculator is only as good as what you feed it.
Frequently asked questions
What is future value?
Future value is what a sum of money will be worth at a later date after it earns interest. It takes your starting amount, adds the growth from your rate over time, and gives you one number. A future value of money calculator does this math for you in seconds.
What's the difference between future value and present value?
Present value is what your money is worth today. Future value is what it grows into later, once interest is added. The calculator turns one into the other so you can see the payoff of waiting and letting it compound.
How is future value calculated?
The core formula is Future Value = Present Value × (1 + r) raised to the number of periods, where r is the rate per period. When you add regular deposits, each one earns interest from the day it lands, so the tool folds those contributions in too.
What interest rate should I use?
Use a rate that fits where the money sits. A high-yield savings account might be around 4%, while a long-term stock index fund has historically averaged closer to 7% to 10% before inflation. Pick a realistic number and test a few to see the range.
Does the calculator account for inflation and taxes?
By default it shows your raw balance before inflation and taxes. To gauge real spending power, lower your rate by your inflation estimate. For taxes, remember accounts like a 401(k) or IRA are treated differently, so check the rules that apply to you.
Can I use it for monthly contributions?
Yes. Enter your regular deposit and how often you make it, and the calculator grows both your starting amount and every contribution. This is the best way to see how small, steady saving builds up over many years.