About Us - Who Runs Lumpsum Calculator & How It Works
Lumpsum Calculator is an independent site with free compound-return tools. Learn who runs it, how the formulas work, and how we keep results accurate.
Why We Built This
Most investment calculators are run by financial companies trying to sell you something. We wanted to build a tool that's 100% focused on helping you - no product recommendations, no email harvesting, just accurate calculations you can trust.
Who Runs This Site
Lumpsum Calculator is an independent website built and maintained by a solo developer with a long-standing interest in personal finance. It is not owned by a bank, a fund house, or any company that sells investment products.
That independence is the point. We have nothing to sell you, so the only job of this site is to give you accurate numbers, clearly explained.
The site is free to use. To keep it running, we may show advertising. Advertisers never influence the formulas, the results, or anything we write.
How Our Numbers Are Calculated
Every calculator on this site uses standard, textbook financial formulas - the same compound interest and annuity math used across the industry. Nothing is hidden: each formula, with its assumptions and limits, is documented on our Methodology page, and the official references we rely on are listed on our Sources page.
What Makes Us Different
- Inflation-adjusted returns (see your REAL purchasing power)
- Side-by-side Lumpsum vs SIP comparison
- No registration required - use immediately
- No product recommendations or sales pitches
- Mobile-friendly design for calculations on the go
- Educational guides in plain English
Accuracy, Updates & Limits
- Results are estimates based on the numbers you enter. They are educational, not a prediction or a guarantee, and nothing on this site is financial advice - our Disclaimer explains the limits.
- We review the calculators and guides regularly, and every meaningful change is logged on our Updates page.
- Spotted an error? Email us. Confirmed issues are fixed and noted in the changelog.
Get in Touch
Found a bug? Have a suggestion? Want to say hi? We'd love to hear from you.