Motivated by my curiosity, I decided to take a closer look at CERN’s budget from 2008 to 2025, not as an official analyst but just an observer. Here, I am writing about what I found and a quick discussion about the trends in the budget and the effect of inflation.

[!NOTE] Disclaimer: This analysis is not comprehensive, nor official CERN commentary, but a dive into public data mixed with straightforward inflation economics.

I worked with two views of the same numbers. The first is nominal CHF. The second is inflation adjusted series in constant 2008 CHF using a Swiss CPI index built from annual rates and rebased to 2008 = 100, via Real = Nominal * (100 / CPI). I also keep Eurozone inflation in mind to understand the wider price environment, though I do not convert costs between CHF and EUR here. The plots show the LHC periods on the same axis, Run 1, LS1 (Long Shutdown 1), Run 2, LS2 (Long Shutdown 2), and Run 3. That context matters because upgrade work and operations do not pull on the budget in the same way.

Figure 1: CERN Budget 2008–2025: Nominal vs Inflation-adjusted (CHF) with LHC operational periods

Starting with the big picture, Figure 1 shows the absolute budget amounts in millions of CHF over time, comparing nominal values (actual money allocated each year) with inflation-adjusted values (purchasing power in constant 2008 CHF). The level view is calm. Nominal funding rises over the period and reaches its high in 2025 at about 1429 MCHF (Million Swiss Francs) , while the real series peaks earlier in 2020 near 1439 MCHF and eases slightly after. Dips around 2013 to 2014 and steadying after 2015 lining up with LS1 and the ramp into Run 2. The climb toward 2019 to 2021 coincides with LS2 preparation and work. The pattern is what you would expect in a long program, stable operation during runs, heavier activity during shutdowns, and no sharp breaks.

Figure 2: Year-over-Year Change: Nominal vs Real (Swiss CPI) with LHC operational periods

Looking at volatility patterns, Figure 2 displays the annual percentage changes in budget from one year to the next, showing both nominal and real growth rates. These year-over-year changes show small swings in most years with clear inflection at shutdown boundaries. The largest positive step occurs at the exit from LS1 as Run 2 starts, with 2015 growing by roughly +11.1% nominal and +12.3% real. The largest negative step is the LS1 entry in 2013, about -7.9% nominal and -8.4% real. Later movements are modest single-digit changes, which fits an organization planning in multi-year blocks rather than in jumps and reflects that volatility is concentrated around shutdown transitions rather than within mature run periods.

Figure 3: Cumulative Growth since 2008: Nominal vs Real (Swiss CPI) with LHC operational periods

To understand the long-term trajectory, Figure 3 presents the total percentage growth accumulated since 2008 for both nominal and real budget values, showing how much the budget has grown overall from the baseline year. This cumulative growth perspective is the easy read. Nominal ends near +23% versus 2008. Real ends near +9% The difference between the two series is the cumulative effect of prices over the period. Both curves share the same turning points, reinforcing the link with program phases, only the vertical offset differs.

Figure 4: Indexed series (2008 = 100): Nominal and Real with LHC operational periods

For a cleaner comparison of growth patterns, Figure 4 shows both budget series as index values where 2008 equals 100, allowing direct comparison of relative growth trajectories without being influenced by the absolute amounts. Indexing both lines to 2008 = 100 makes slopes comparable without units. By 2025 the nominal index is about 123 and the real index about 109. The shape coherence is clear, the same peaks and troughs appear in both series, while the real line sits consistently lower through the middle years before narrowing as inflation remains mild in Switzerland in the late period.

Figure 5: Purchasing Power Index (Real/Nominal) with LHC operational periods

Shifting focus to purchasing power erosion, Figure 5 plots the ratio of real to nominal budget values, effectively measuring how much purchasing power each nominal CHF retains after adjusting for inflation. This purchasing power index, defined as real divided by nominal, starts around 1.13 in 2008 and trends toward 1.00 by 2023 to 2025. A shallow mid-decade hump around 2015 to 2016 indicates a phase where more of the nominal increase carried through in real terms. Values at or near parity after 2022 reflect the CPI treatment in these inputs, with different CPI updates the last points could sit slightly above or below one. But the interpretation is the same nominal and real converge when price growth is modest.

Figure 6: Absolute gap between adjusted and nominal (MCHF) with LHC operational periods

To quantify the inflation impact in concrete terms, Figure 6 shows the absolute difference in millions of CHF between the inflation-adjusted and nominal budget values, quantifying exactly how much additional funding is needed due to inflation effects. This absolute gap in MCHF quantifies how much of the headline flow is due to prices rather than extra capacity. It is larger in the early years, roughly 151 MCHF in 2008, about 124 MCHF in 2009, and about 121 MCHF in 2010. Then it declines through the decade to around 83 MCHF by 2020, about 44 MCHF in 2021, around 16 MCHF in 2022, and essentially zero in 2023 to 2025 given the CPI application used here. This is not a performance metric, it is only a measure of the price layer over nominal funding.

What should we take from this analysis? As demonstrated across Figures 1-6, nominal support is steady and grows over time. Real purchasing power also grows, but more gently, ending about 9% above 2008 in these inputs. The LHC phases line up with the timing of larger movements, especially at shutdown transitions. None of the figures argue for a sudden expansion or contraction, they show a program paced by long-lead upgrade work and predictable operations.

There are limits here and they matter. Swiss CPI is a proxy, not CERN’s exact cost basket, energy, cryogenics, and specialist labor can move differently from consumer prices. Euro-area exposure exists, but I do not apply CHF/EUR exchange rates to the series. The inputs are annual, so within-year timing is ignored. The focus is the central CERN budget only. The LHC experiments have their own budgets, and many projects are funded directly by institutions or through in-kind contributions. Because of this, the plots describe broad trends, not a full accounting of all resources behind the LHC program.