Free Compound Interest Calculator
Free compound interest calculator. See exactly how your savings or investments grow with compound returns. Instant, no sign-up.
UK Finance Calculator
Compound Interest Calculator.
See Your Money Grow. Instantly.
Calculate exactly how savings or investments grow with compound interest over any time period. Free, no sign-up.
No sign-up100% freeInstant resultsWorks on iPhone
Compound Interest Calculator
Final value
£0
Interest earned
£0
Total growth
0%
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More from Kaeltripton — UK Finance Guides
Free Compound Interest Calculator 2025
Compound interest is what makes long-term saving so powerful — you earn interest on your interest, not just your original deposit. This calculator shows exactly how an investment grows over time at any rate and compounding frequency.
Compound interest formula
A = P(1 + r/n)^(nt) where P = principal, r = annual rate, n = compounding periods per year, t = years.
Best UK savings rates 2025
See our best savings accounts UK and best ISA accounts guides for current top rates.
Frequently asked questions
What is compound interest?+
Compound interest is interest calculated on both your initial deposit and the interest already earned. Over time this creates exponential rather than linear growth.
How often should interest compound?+
The more frequently interest compounds, the faster growth. Daily compounding yields slightly more than monthly, which yields more than annual.
Is this updated for 2025?+
Yes — the formula is universal. Enter any current interest rate to calculate growth.
Does it include tax?+
No — this is a pre-tax calculation. UK savings interest may be subject to income tax above the Personal Savings Allowance.
