Financial Calculator Online
Calculate simple and compound interest on a lump sum. Ideal for quick savings and loan interest estimates.
Initial savings or loan amount.
Simple vs compound interest
Simple interest is calculated only on the original principal. Compound interest is calculated on the principal plus any interest already earned, so it grows faster over time.
This calculator assumes annual compounding for the compound interest figure. Real savings accounts and loans may compound monthly or daily, which will give slightly different results.
Example
If you invest £10,000 at 5% per year for 5 years:
- simple interest = £10,000 × 0.05 × 5 = £2,500
- compound interest ≈ £2,762.82
- final amount ≈ £12,762.82
Related calculators
Cite This Calculator
Reference this calculator on your website or in your work using the citation below:
HTML Citation Code:
<p>Calculator: <a href="https://onlinecalculator.co.uk/finance/financial-calculator-online" target="_blank">Financial Calculator Online</a> - OnlineCalculator.co.uk</p>APA Style Citation:
OnlineCalculator.co.uk. (2025). Financial Calculator Online. Retrieved from https://onlinecalculator.co.uk/finance/financial-calculator-onlineNote: This calculator is free to use and reference. No permission required for educational or commercial citation.