Template talk:Inflation

Template:Inflation is permanently protected from editing as it is a heavily used or highly visible template. Substantial changes should first be proposed and discussed here on this page. If the proposal is uncontroversial or has been discussed and is supported by consensus, editors may use {{edit template-protected}} to notify an administrator or template editor to make the requested edit. Usually, any contributor may edit the template's documentation to add usage notes or categories. Any contributor may edit the template's sandbox. Functionality of the template can be checked using test cases.

This is the talk page for discussing improvements to the Inflation template.

Put new text under old text. Click here to start a new topic. New to Wikipedia? Welcome! Learn to edit; get help. Assume good faith Be polite and avoid personal attacks Be welcoming to newcomers Seek dispute resolution if needed

Archives: 1, 2, 3, 4Auto-archiving period: 6 months

This template does not require a rating on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Economics This template is within the scope of WikiProject Economics, a collaborative effort to improve the coverage of Economics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.EconomicsWikipedia:WikiProject EconomicsTemplate:WikiProject EconomicsEconomics Finance & Investment This template is within the scope of WikiProject Finance & Investment, a collaborative effort to improve the coverage of articles related to Finance and Investment on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.Finance & InvestmentWikipedia:WikiProject Finance & InvestmentTemplate:WikiProject Finance & InvestmentFinance & Investment

Archives

Archive 1 Archive 2 Archive 3 Archive 4

This page has archives. Sections older than 180 days may be auto-archived by Lowercase sigmabot III if there are more than 4.

Some weird stuff's happening on Template:ShipCost/doc and Template:AircraftCost/doc due to this template.
{{ShipCost|FRA|3600000|year=1795}} Works fine.
{{ShipCost|FRA|3600000|year=1796}} hell breaks loose. Claiming NaN and reports a misnested strong error.
{{AircraftCost|FRA|3600000|year=1795}} Works fine.
{{AircraftCost|FRA|3600000|year=1796}} Broken, claiming NaN and reports a misnested strong error.
If someone knows what's going on here and can correct the issue, would you? Thanks! Zinnober9 (talk) 23:09, 1 March 2025 (UTC)[reply]

@Zinnober9, I think I fixed it. The problem is at {{ItemCost}}, the FR dataset here does not have data for 1796 and 1797, but the minimum year for {{ItemCost}} was set to 1795, that’s the reason for the broken templates above for year 1796 and 1797. Tvpuppy (talk) 01:18, 7 July 2025 (UTC)[reply]

I've just noticed that {{Inflation}} Will ignore any commas. Why? Isn't it possible to have the input/output figures consistent with each other?

My example:

{{Inflation|UK|12000|1385|cursign=£|fmt=eq|orig=yes}}

results in:

£12000 (equivalent to £12,378,344 in 2023) (i.e., £12000, no comma, £12 million, commas.)

Cheers, —Fortuna, imperatrix 10:22, 13 June 2025 (UTC)[reply]

The above example is confusing because it has no comma in the input but we worked it out at Wikipedia:Help desk#Template:Inflation (comma (in)consistency). Commas are only ignored when the value is used in calculations, not when the original value is displayed with |orig=yes, so "Will ignore any commas" in the documentation seems a little misleading. It turned out the poster had an unrelated issue: An empty |r= causes an error. {{Inflation|KRW|100|2000|r=}} produces:

Error when using {{Inflation}}: NaN/calculation error please notify Template talk:Inflation.

Templates are usually coded to produce the same with an empty and an omitted parameter. It's done with the simple {{{r|}}} if there is no default but it gets messier with a default. If the call has an empty |r= then {{{r|0}}} will produce the empty string and not 0. I suggest this workaround to replace the two {{{r|0}}}: {{#if:{{{r|}}}|{{{r}}}|0}}. It says: If r is both set and non-empty then use r, otherwise use 0. PrimeHunter (talk) 13:51, 13 June 2025 (UTC)[reply]

Thanks PrimeHunter, apologies for posting twice. I realised after posting here that it didn't seem to get much footfall so went to yon desk instead. I meant to delete this one. —Fortuna, imperatrix 09:23, 14 June 2025 (UTC)[reply]

Just an FYI: see Wikipedia:AutoWikiBrowser/Tasks § Articles using Template:Inflation with CURRENTYEAR. Graham87 (talk) 07:27, 15 June 2025 (UTC)[reply]

I got no response there, so I'll go through and fix them myself. Graham87 (talk) 07:34, 19 July 2025 (UTC)[reply]

All done ... including those that use the template {{CURRENTISOYEAR}}. Graham87 (talk) 11:20, 29 July 2025 (UTC)[reply]

This edit request to Template:Inflation/year and Template:Inflation/fn has been answered. Set the |answered= parameter to no to reactivate your request.

please update the CL year in {{Inflation/year}} and the citation year in {{Inflation/fn}} from 2020 to 2024, see update to Template:Inflation/CL/dataset.

Diff:

−

2020

+

2024

B1mbo (talk) 20:14, 22 July 2025 (UTC)[reply]

 Completed. P.I. Ellsworth , ed. – welcome! – 20:23, 23 July 2025 (UTC)[reply]

This edit request to Template:Inflation/year and Template:Inflation/fn has been answered. Set the |answered= parameter to no to reactivate your request.

In Template:Inflation/year: | NL = 2024

In Template:Inflation/fn, add second source:

{{#tag:ref|'''1900–present:''' {{cite web |title=Prijzen toen en nu |url=https://www.cbs.nl/nl-nl/visualisaties/prijzen-toen-en-nu |language=nl |website=cbs.nl |publisher=[[Centraal Bureau voor de Statistiek]]}} '''1450–1900:''' {{cite web |date=2021-06-14 |title=Value of the Guilder versus Euro |url=https://hdl.handle.net/10622/VY7UY3 |website=iisg.amsterdam |publisher=[[International Institute of Social History]] |url-status=dead |archive-url=https://web.archive.org/web/20240524174557/https://iisg.amsterdam/en/research/projects/hpw/calculate.php |archive-date=2024-05-24 |access-date=2025-07-29}}|name=inflation-NL|group={{{group|}}} }}

1900–present: "Prijzen toen en nu". cbs.nl (in Dutch). Centraal Bureau voor de Statistiek. 1450–1900: "Value of the Guilder versus Euro". iisg.amsterdam. International Institute of Social History. 2021-06-14. Archived from the original on 2024-05-24. Retrieved 2025-07-29.}}

— TheThomanski | t | c | 18:26, 29 July 2025 (UTC)[reply]

 Done * Pppery * _{it has begun...} 04:33, 2 August 2025 (UTC)[reply]

Thanks for all the great work on this template. Regarding the footnotes for source of inflation data, for UK, it is

 {{Inflation/fn|UK}} 

producing a footnote that specifically names the year "2017" as the date of the a source (I'm trying to copy & paste the text of the footnote, but the paste is failing) The source is website: https://measuringworth.com/datasets/ukearncpi/ which appears to be up-to-date thru 2024. So, the "2017" date displayed in the footnote should be updated from "2017" to "2023" or "2024". Noleander (talk) 15:06, 31 July 2025 (UTC)[reply]

I am looking at Kandovan Tunnel to insert: {{inflation|IR|24,853,400|1938}} which generates:

• Error when using {{Inflation}}: |start_year=1938 (parameter 3) is greater than the latest available year (1398) in index "IR".

Indeed this template's documentation says the limit is 1398, with the source link dead. Is this an error or some sort of historical currency limitation?

Personal side note: the source used in the article - I will need to figure out a conversion to US dollars at some point. Commander Keane (talk) 11:55, 7 August 2025 (UTC)[reply]

This appears to be due to Iran using the Solar Hijri calendar, which has a 621 year offset. It isn't very intuitive for the template to use it, and it could be good to have an alternate way to input Common Era years when computing Iranian currency. Chaotic Enby (talk · contribs) 00:27, 19 October 2025 (UTC)[reply]

This edit request to Template:Inflation/fn has been answered. Set the |answered= parameter to no to reactivate your request.

''[http://www.jstor.org/stable/43295548 Consumer Prices and Real Wages in Taiwan and Korea Under Japanese Rule]''. Hitotsubashi Journal of Economics should be "[http://www.jstor.org/stable/43295548 Consumer Prices and Real Wages in Taiwan and Korea Under Japanese Rule]". ''Hitotsubashi Journal of Economics''

per MOS:MINORWORK and MOS:MAJORWORK. —DocWatson42 (talk) 08:20, 25 August 2025 (UTC) DocWatson42 (talk) 08:20, 25 August 2025 (UTC)[reply]

 Completed. P.I. Ellsworth , ed. – welcome! – 15:30, 25 August 2025 (UTC)[reply]

Thank you. ^_^ —DocWatson42 (talk) 20:10, 25 August 2025 (UTC)[reply]

Happy to help! Paine  21:36, 25 August 2025 (UTC)[reply]

This edit request to Template:Inflation/year has been answered. Set the |answered= parameter to no to reactivate your request.

Request: change | TR = 2021 to | TR = 2024 on Template:Inflation/year. Zoozaz1 (talk) 20:45, 26 August 2025 (UTC)[reply]

 Done Chaotic Enby (talk · contribs) 12:04, 19 October 2025 (UTC)[reply]

This edit request to Template:Inflation/year has been answered. Set the |answered= parameter to no to reactivate your request.

Request to change | BD = 2023 to | BD = 2024 for Template:Inflation/year. Mehedi Abedin 09:50, 14 September 2025 (UTC)[reply]

 Done Chaotic Enby (talk · contribs) 12:03, 19 October 2025 (UTC)[reply]

A number of countries sub-templates, for example, Egypt's. have been nominated for deletion here All the best: Rich Farmbrough 15:17, 17 September 2025 (UTC).[reply]

A while ago I asked about the r parameter. Coming back to that problem, I'm forced to wonder why we have to do this at all. Not only is it finicky and complicated to understand, it's the kind of thing computers are very good at doing. I almost universally see people misuse the template and trying to correct them is usually an exercise in futility. My training is in engineering, where the concept of significant digits was pounded into our heads; if we gave either too many or too few significant digits on an exam problem, it would be marked wrong. I don't expect most wikipedia authors to understand with that level of technical rigor how that works so it seems absurd to assume they will be able to figure out the correct r value to use.

Why can't this be totally automatic? I don't know Lua, but it looks like a perfectly reasonable programming language with good support for the usual range of math and string operations. Writing a Lua module to do this completely automatically seems like it would be a straight-forward exercise for somebody who knows the language. RoySmith (talk) 15:23, 1 October 2025 (UTC)[reply]

The more I dig into this, the more confused I get. I decided to work a few examples by hand to make sure I could replicate the template results (User:RoySmith/sandbox).

• ${{Inflation|US-GDP|1000|1800|fmt=c}} in {{Inflation/year|US-GDP}}{{Inflation/fn|US-GDP}} (US-GDP)
• ${{Inflation|US|1000|1800|fmt=c}} in {{Inflation/year|US}}{{Inflation/fn|US}} (US)

gives me

• $23,367 in 2024^[1] (US-GDP)
• $18,527 in 2024^[2] (US)

i.e.:

$22,769 in 2023[1] (US-GDP)
$18,527 in 2024[2] (US)

Clicking through to the first cited source and retrieving the data for US GDP Deflator for 1800 to 2023 gets me 5.37 and 122.39 for the endpoints. Calculating 1000 * (122.39 / 5.37) gives me $22,791. But the template said it was $22,769. That's pretty close, but I would expect a computer could do math better than pretty close. So what's going on there?

Clicking through to the second source, I get 51 and 942.7 for the endpoints. 1000 * (942.7 / 51) = 18,484. Again, not matching the template value of $18,527. Again, what's going on?

Why is IN the only currency (per the documentation) for which {{inflation/fn}} uses CS2? I think it would be much cleaner if all of the templates used CS1 templates, e.g., {{cite journal}}.

It might also be clearer which sources point to which years by using a template. I would advocate for using {{multiref}} or {{multiref2}}. Snowman304|talk 01:36, 11 October 2025 (UTC)[reply]

This edit request to Template:Inflation/year has been answered. Set the |answered= parameter to no to reactivate your request.

Change: US-CAP = 2023

To: US-CAP = 2024 Titan877 (talk) 02:41, 16 October 2025 (UTC)[reply]

 Done Chaotic Enby (talk · contribs) 12:03, 19 October 2025 (UTC)[reply]

{{Inflation|index=US|value=0.50|start_year=1908|r=2|fmt=eq}}

produces "equivalent to $17.5 in 2024". How do I convince it to include the trailing zero for the cents, i.e. "equivalent to $17.50 in 2024"? RoySmith (talk) 11:58, 29 October 2025 (UTC)[reply]