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What if it goes up by X%?

How a value changes with a percentage increase or decrease, repeated several times, and what it takes to get back.

Enter your data: no value is filled in for you.

A price, a salary, a bill…

%

Negative if it falls.

For example, years with the same increase.

Result

Waiting for your data. Fill in all the fields.

Calculation version: personal@1.0.0. The calculation runs in your browser: we don't send or store the amounts you enter. We only count, without identifying you, that the tool has been used.

How to use it

  1. 1Enter the starting value: a price, a salary, a bill…
  2. 2Enter the change as a percentage (negative if it falls) and how many times in a row it repeats.

How it calculates

  • After one change: value × (1 + p).
  • After n changes in a row: value × (1 + p)ⁿ.
  • To get back to the starting value you need a change of 1 / (1 + p) − 1.
  • Purchasing power of a fixed amount: value / (1 + p)ⁿ.

See the full methodology →

Verifiable example

1,000 with a 3% increase becomes 1,030; with ten 3% increases in a row, 1,343.92 (34.39% more). After a 25% increase, a 20% decrease is needed to get back.

Limitations

  • It assumes the same percentage every time.

What the paid levels will add

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    Every World Bank series and more indicators on the charts.

    Coming in the Pro level · Coming soon

    Cloud projects, more capacity and reports without watermark.

    Designed for: People starting a business and less specialised companies

    Only the Basic level exists today, and it is free. The other levels can't be bought yet and have no published price; this is the current plan and may change.

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    Price and signal alerts

    Notification when a commodity crosses a threshold or changes trend.

    Coming in the Advanced level · Coming soon

    Each module's professional engines, alerts, scheduled updates and reports with methodology.

    Designed for: Startups and growing companies

    Only the Basic level exists today, and it is free. The other levels can't be bought yet and have no published price; this is the current plan and may change.

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  • Advanced· soon

    Forecasting & Risk Lab

    Forecasts with intervals, adverse scenarios and stress tests with back-testing when enough history exists.

    Coming in the Advanced level · Coming soon

    Each module's professional engines, alerts, scheduled updates and reports with methodology.

    Designed for: Startups and growing companies

    Only the Basic level exists today, and it is free. The other levels can't be bought yet and have no published price; this is the current plan and may change.

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  • Master· soon

    Stocks, indices and licensed market data

    Real-time quotes from licensed providers and API.

    Coming in the Master level · Coming soon

    Everything without practical limits: optimisation, Monte Carlo simulation, AI with your projects' context, API and licensed data.

    Designed for: Large companies, specialist consultancies and universities

    Only the Basic level exists today, and it is free. The other levels can't be bought yet and have no published price; this is the current plan and may change.

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Indicative result

It doesn't constitute financial, tax or investment advice. Check important decisions with a professional.