Financial calculators

Decide with numbers, not intuition.

Nine open tools to simulate investing, saving, inflation, debt and goals. Move the sliders, check the result and, if you want, save your scenarios in Vunto to turn an idea into a plan.

FreeNo sign-upEach one with its Learn guide
Most used

Compound interest

Simulate initial capital, monthly contributions, return and time to see how your wealth grows. Try it here: the full version adds inflation, taxes and scenario comparison.

Open the full calculator →Read the guide
€300
20
7%
Estimated wealth€152,261
Currency converter

Convert currencies at mid-market rates

Check major currencies with refreshed data and local formatting. Useful for portfolios, travel and international purchases.

Loading exchange rate

1 BRL = 0.1706 EUR
Converts to
170.65

Estimated result: 170.65 EUR. Educational information, not a currency exchange service.

To start investing

Market entry

DCA vs Lump Sum

Compare investing all at once versus contributing periodically and decide with less anxiety.

Example: $12,000 at once vs $1,000/month for one year
Open →Read the guide
Purchasing power

Inflation

Measure how much real value your idle money loses over time.

Example: $20,000 today equals $13,460 in 20 years at 2%
Open →Read the guide
Net return

ROI

Calculate estimated net return including taxes, fees and holding period.

Example: +50% in 5 years equals 8.4% annualized
Open →Read the guide

To optimize your portfolio

Passive income

Dividends

Project dividends, yield, growth and reinvestment over the long term.

Example: $50,000 at 3.5% generates $1,750/year
Open →Read the guide
Ordered portfolio

Rebalancing

Decide where to put new contributions to move back toward your target.

Example: with a $20,000 portfolio, an 8% drift suggests contributing $1,600
Open →Read the guide

Debt and goals

Debt

Mortgage

Visualize how much interest you can save with an extra monthly repayment.

Example: +$100/month can save around $9,000 in interest
Open →Read the guide
Goals

FIRE

Calculate target capital and estimated time to cover your expenses with your portfolio.

Example: $2,000/month expenses imply a target of $600,000
Open →Read the guide
FAQ

Before using the calculators

Are the calculators free and registration-free?

Yes. Vunto public calculators are free and do not require an account. With a free account you can save scenarios and apply them to tracking your wealth.

How are results calculated?

Each calculator shows estimated results from the variables entered, and its Learn guide explains the concept with examples. They are educational estimates, not guaranteed projections.

Which one should I start with?

If you are starting out, begin with compound interest and inflation. Then move to DCA, ROI and portfolio tools such as dividends, risk/reward and rebalancing.

Can I save my simulations?

Public calculators work without registration. To save scenarios and bring them into the dashboard you need a free Vunto account.

Is this financial advice?

No. Vunto calculators and guides are educational information. Vunto is not registered with the CNMV and does not issue personalized investment recommendations.

From simulation to plan

A calculator gives you a snapshot. With Vunto you can save scenarios and turn them into tracking: goals, contributions, portfolio, alerts and AI questions when something does not add up.

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Updated in June 2026 · Educational directional results · Educational information, not financial advice. Past performance does not guarantee future results.