See how compound interest grows your money over time. Compare banks, neobanks, and DeFi.
Simulation
$
$
%
Currency
Inflation adjusted
Assumes a fixed 2% annual inflation rate. Real returns are reduced accordingly — what you see reflects actual purchasing power, not just nominal value.
¹ Revolut Standard plan. Up to 2.25% on Ultra.
² ING rate after 6-month promotional period.
³ EU average for traditional savings accounts (ECB, Oct 2025).
How This Calculator Works
This savings interest calculator lets you compare how your money grows across different providers — from traditional banks to neobanks and DeFi lending protocols. Enter your initial deposit, set up recurring contributions, choose a time horizon, and adjust the interest rate to see results instantly.
The compound interest formula used is: FV = P × (1 + r)t + C × [((1 + r)t − 1) / r], where P is your principal, r is the annual rate, t is the number of years, and C is your annual contribution. Each year, interest is earned on your full balance including previously earned interest — that's the power of compounding.
All results update in real-time as you change any input. You can also toggle between USD and EUR, or enable inflation adjustment to see your returns in today's purchasing power.
Savings Interest Rates Compared
European savings interest rates as of February 2026
Provider
Type
Interest Rate (AER)
Deposit Protection
Access
unflat
DeFi
4–7%
Not government insured
Instant
Revolut
Neobank
2.00%
€100K EU DGS
Instant
ING
Bank
1.25%
€100K EU DGS
Instant
Traditional Banks
Bank
0.50%
€100K EU DGS
Instant
Understanding Compound Interest
A compound interest calculator helps you see what most people underestimate: the exponential nature of long-term savings growth. When interest is compounded, you earn returns not only on your original deposit but also on every bit of interest accumulated before it. Over 10 or 20 years, this effect becomes dramatic.
How much interest will I earn? The answer depends on three things: the bank interest rate offered, how much you deposit, and — most importantly — time. A modest savings account interest rate of 2% looks small in year one, but over 30 years with monthly contributions, it produces a balance far larger than the sum of your deposits.
The difference between rates matters more than most people think. At 0.50%, savings growth over time is barely above what you put in. At 4–7%, compound interest transforms your deposits into a meaningfully larger sum. That gap widens every year, which is why comparing rates early makes such a big impact.
Use the calculator above to model your own scenario. Try different rates, switch between time horizons, and toggle inflation adjustment to see what your savings are really worth in today's money.
Frequently Asked Questions
How much interest will I earn on my savings?
It depends on your interest rate, deposit amount, and time horizon. At a traditional bank rate of 0.50%, $10,000 earns about $253 over 5 years. At 6.50% (DeFi lending), the same amount grows to $13,700. Use our calculator above to see your exact numbers.
What is a good savings account interest rate in 2026?
In Europe, traditional banks offer 0.3%–0.6%. Neobanks like Revolut and Trade Republic offer around 2.00%. High-yield options like DeFi lending protocols offer 4%–7%, though with different risk profiles. The ECB deposit facility rate is currently 2.00%.
How does compound interest work?
Compound interest means you earn interest on your interest. Your balance grows by the interest rate each year, and the next year's interest is calculated on the new, higher balance. The formula is: Future Value = Principal × (1 + rate)years. Over long periods, this creates exponential growth.
Is it safe to earn higher interest through DeFi?
DeFi lending protocols like those used by platforms such as unflat offer higher yields because borrowers must deposit more collateral than they borrow (overcollateralized). However, unlike bank deposits, these are not government-insured. Smart contract risk and stablecoin risk exist. Never deposit money you cannot afford to lose.
Why do banks pay so little interest on savings?
Traditional banks use your deposits for their own lending and investments, keeping most of the profit. They also have high overhead costs (branches, staff, compliance). Digital-first platforms and DeFi protocols have lower costs and can pass more yield to depositors.
