About LanternTools
We built LanternTools because financial calculators should be clear, honest, and helpful — not confusing, upselling, or full of jargon. Everyone deserves tools that help them make smarter money decisions.
What we do
LanternTools is a free collection of financial calculators covering compound interest, savings goals, investment growth, regular contributions, retirement planning, inflation-adjusted returns, and the debt-vs-investing decision. Every calculator is built around one goal: give you a clear, honest picture of how your money could grow.
We also publish in-depth educational guides that explain the financial concepts behind each calculator in plain English — to make sure you understand what the numbers actually mean, not just what they say.
Our principles
- Clarity first. Every label, result, and explanation is written in plain English. If you need a finance degree to understand a result, it has failed its purpose.
- Your data stays with you. All calculations run in your browser. We never see, store, or transmit your financial inputs. Your numbers are entirely private.
- No financial advice. We are an educational resource, not a financial adviser. Results are illustrative projections, not guarantees or recommendations.
- Free, always. Every calculator is free to use — no account, no paywall, no credit card required. We are supported by advertising, which is clearly labelled.
- Genuinely educational. We write our own content. Every guide is written to be genuinely useful, not to game search rankings.
Who is LanternTools for?
Our calculators are designed for anyone who wants to make better decisions about money without needing a financial background — people beginning to save seriously, long-term investors, future retirees, people with debt wondering whether to invest or pay it off, and curious learners who want to understand the maths behind concepts like compound interest.
Our calculators
- Compound Interest Calculator — see how a balance grows with compounding and contributions.
- Savings Goal Calculator — find out when you will reach a specific target.
- Investment Growth Calculator — project your portfolio over time.
- Regular Contribution Calculator — understand the impact of consistent saving.
- Retirement Growth Calculator — model your retirement savings at any retirement age.
- Inflation-Adjusted Returns Calculator — see real returns after inflation.
- Debt Payoff vs Investing Calculator — compare paying off debt early vs investing the surplus.
Contact
Have a suggestion or spotted an error? Use our contact form.