ISTAT monetary revaluation calculator
What an amount from a past month is worth today, using the FOI index excluding tobacco that Italy uses for rents, maintenance payments and claims. With the coefficient and every step of the calculation.
Latest index available: August 2026. Data updated on 10/10/2026.
The result is for guidance only and does not replace a professional's calculation. The calculation runs in your browser: amounts and dates are not sent anywhere.
Source: ISTAT, consumer price index for blue- and white-collar households (FOI) excluding tobacco, CC BY 4.0 licence. Method from ISTAT's note on linking coefficients, January 2026.
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Linking coefficients between bases
ISTAT periodically changes the index base year. To compare months expressed in different bases, you multiply by the linking coefficient of each change. The calculator applies all of them for you.
| Base | Used from | Link from previous base |
|---|---|---|
| 1961=100 | January 1947 | – |
| 1966=100 | January 1967 | 1.274 |
| 1970=100 | January 1971 | 1.116 |
| 1976=100 | January 1977 | 1.996 |
| 1980=100 | January 1981 | 1.862 |
| 1985=100 | January 1986 | 1.907 |
| 1989=100 | January 1990 | 1.242 |
| 1992=100 | January 1993 | 1.189 |
| 1995=100 | January 1996 | 1.141 |
| 2010=100 | January 2011 | 1.373 |
| 2015=100 | January 2016 | 1.071 |
| 2025=100 | January 2026 | 1.214 |
From February 1992 the index excludes tobacco. Periods spanning that month are also multiplied by 1.0009.
Frequently asked questions
Which index does the calculator use?
ISTAT's consumer price index for blue- and white-collar households (FOI) excluding tobacco, the one published in Italy's Official Journal for adjusting monetary values (art. 81 of Law 392/1978). It excludes tobacco from February 1992; for earlier months ISTAT uses the index including tobacco and a linking coefficient of 1.0009.
What changes with the new 2025 base?
From January 2026 the index has base 2025=100. To compare a 2026 month with an earlier one you multiply by the linking coefficient 1.214 (from base 2015). The calculator does it for you, as with the older links, and the steps show which ones it used.
How is the result rounded?
As ISTAT specifies: the coefficient is computed in a single step and rounded to 3 decimals, the percentage change to 1 decimal. The revalued amount is amount times coefficient, rounded to the cent: the calculator follows the same method as ISTAT's official Rivaluta calculator. Applying the rounded percentage change instead can differ by a few cents.
How is a rent adjusted?
For non-residential leases the increase cannot exceed 75% of the change in the FOI index (art. 32 of Law 392/1978), and many residential leases use the same measure. Which months to compare, and whether to apply 75% or 100%, is set by the lease: choose the months and the mode accordingly.
Does it work for maintenance payments?
Yes, if the court order or the agreement links the payment to ISTAT indices: choose full revaluation, the month the payment started or was last adjusted, and the month you want to reach. Amount and timing are set by the order.
Up to which month do the indices go?
ISTAT publishes each month's index around the middle of the following month. The latest month in the calculator is August 2026, with data updated on 10 October 2026: it is also shown above the result.
Do you store the amounts I enter?
No. The calculation runs in your browser on a copy of the ISTAT indices: amounts and dates never reach us or anyone else.