GURPS 4E Core Ruleset

This unofficial GURPS Ruleset for Fantasy Grounds is developed with the permission of Steve Jackson Games.

Latest Release Downloads

GURPS 4E Core Ruleset - FG Unity (FG Unity only)
FG Forge shop (FG Unity users only): FG Forge Shop
(Updated: 10th May 2026)

GURPS 4E Core Ruleset - FG Classic (FG Classic only. The ruleset for FG Classic is no longer being updated)
Download latest release from here: https://bit.ly/GURPS4ECore
(Updated: 14th Mar 2022)

* Here is a video demonstrating some of the features of the GURPS ruleset (it will be updated some day): https://youtu.be/pSm-9Trzd5w

GURPS Core Theme for Unity (No longer being updated)
Download the latest release of the GURPS Core theme from here: https://bit.ly/GURPSCoreUTheme
(Updated: 18th Aug 2024)
(Courtesy of Gigermann)

GCA Exporter Files
Download the GCA exporter files from here: https://bit.ly/GCAtoFGExport
(Updated: 21st Aug 2018)
(Courtesy of Andraax)

GURPS No Dice Extension
Download an extension to remove non-GURPS dice from the Fantasy Grounds desktop: https://bit.ly/GURPSNoDiceExt
(Updated: 22nd Oct 2022)
(Courtesy of Ronnke)

* A video tutorial demonstrating the process of exporting and importing characters from GCA5: https://youtu.be/rlKlGlSvayw
* A video tutorial demonstrating the process of exporting and importing characters from GCA4: https://youtu.be/CHn7jkM0UFQ
* A video tutorial demonstrating the process of exporting and importing characters from GCS: https://youtu.be/atTstjdU2_A

Please report any bugs, errors.

You can export and import (player characters only) from the previous ruleset. You can also import PCs/NPCs using the currently available GCA export to FG created by Saithan.

One feature which is not obviously clear, you can drag and drop Skills onto the attributes at the top of the skills section. This will perform an attribute based skill role using the skill's relative levels. eg To do an IQ based, Guns roll, to un-jam a rifle, simply drag and drop the appropriate skill onto the IQ box.

Enjoy.

Suggest New Ideas and Features

Click the following link to have your input on future ruleset development/improvement: http://gurps4efg.idea.informer.com/proj/

Version Information

• GURPS 4e Ruleset v3.19.1 - 10th May 2026 (FG Unity Only)
  - Fixed: Breaking changes from FGU update.

• GURPS 4e Ruleset v3.19.0 - 15th Mar 2026 (FG Unity Only)
  - Added: Knockback to damage application helper.
  - Fixed: Issue with damage calculation.
  - Changed: Better parsing of damage syntax.
  - Changed: Sorted custom conditions in alphabetic order.

• GURPS 4e Ruleset v3.18.4 - 23rd Feb 2026 (FG Unity Only)
  - Fixed: Status color in the combat tracker was not updating correctly.

• GURPS 4e Ruleset v3.18.2 - 10th Feb 2026 (FG Unity Only)
  - Fixed: minor bugs.

• GURPS 4e Ruleset v3.18.1 - 9th Feb 2026 (FG Unity Only)
  - Fixed: Bug with dragging abilities to NPC sheet.
  - Changed: Damage application message.

• GURPS 4e Ruleset v3.18.0 - 8th Feb 2026 (FG Unity Only)
  - Changed: Redesigned character sheet.
  - Changed: Redesigned combat section of NPC sheet.
  - Added: Hardened option to Damage application helper.
  - Added: Half Damage button for range weapons.
  - Fixed: Bug with the Range Modifier toggle button in the map toolbar.
  - Other minor fixes and improvements.

• GURPS 4e Ruleset v3.17.0 - 30th Dec 2025 (FG Unity Only)
  - Added: Preset Conditions to Effects window.
  - Added: Conditions and Effects icons to N/PC map tokens.
  - Added: Injury Status Pip to N/PC map tokens.
  - Added: Death Markers feature.
  - Other minor fixes and improvements.

• GURPS 4e Ruleset v3.16.5 - 16th Aug 2025 (FG Unity Only)
  - Fixed: A bug with the damage helper. Default values for Hit Location and Injury Tolerance were not set.

• GURPS 4e Ruleset v3.16.4 - 31th May 2025 (FG Unity Only)
  - Added: Infinite armor divisor for damage application helper.
  - Added: Fatigue damage to the damage application helper.
  - Fixed: A bug with the 3D view token.

• GURPS 4e Ruleset v3.16.3 - 26th May 2025 (FG Unity Only)
  - Fixed: Bug with drag and drop of damage. Some damage results were not being applied.

• GURPS 4e Ruleset v3.16.2 - 26th May 2025 (FG Unity Only)
  - Fixed: Bug with drag and drop of damage. Armor divisor and damage types were not applied.
  - Reworked: Damage application helper to display important information.
  - Added: Minimum damage on damage rolls for damage types.

• GURPS 4e Ruleset v3.16.1 - 25th May 2025 (FG Unity Only)
  - Fixed: Bug with Reaction rolls. Modifiers were not being applied correctly.

• GURPS 4e Ruleset v3.16.0 - 25th May 2025 (FG Unity Only)
  - Fixed: Code compatibility with CoreRPG.
  - Added: Damage application helper in Combat Tracker. Roll damge with a target, or drag and drop damage to a target, to display the helper in the combat tracker.
  - Added: Complex dice expressions/formulas for damage rolls. eg ((2d+1)x3)-(1d/2)+6 cut.
  - Added: Apply Range Modifier option. Enable the option to automatically apply range modifiers on Ranged Attack rolls.
  - Many other minor changes and fixes.

• GURPS 4e Ruleset v3.15.1 - 11th Apr 2025 (FG Unity Only)
  - Fixed: Combat Tracker menu options.
  - Reworked: The House rule option to randomize turn/initiative order. Added more initiative types. Players can roll their own Initiative from a button next to Basic Speed on the Main tab of the character sheet. GM can roll Initiatives from the Combat Tracker menu.
  - Added: House rule option to automatically roll and/or group NPC initiatives when they are added to the combat tracker.

• GURPS 4e Ruleset v3.15.0 - 28th Feb 2025 (FG Unity Only)
  - Added: Holding CTRL while making a dice roll, that roll will be a secret/tower roll.
  - Added: House rule option to randomize turn/initiative order. A d4 or d6 is added to Basic Speed when adding an N/PC to the combat tracker.

• GURPS 4e Ruleset v3.14.0 - 23rd Nov 2024 (FG Unity Only)
  - Changed: Default modifier box size.
  - Changed: Default dice tower icon.
  - Fixed: FG/CoreRPG (Ver 4.6.0) breaking changes.

• GURPS 4e Ruleset v3.13.2 - 24th Aug 2024 (FG Unity Only)
  - Fixed: Spelling error.

• GURPS 4e Ruleset v3.13.1 - 18th Aug 2024 (FG Unity Only)
  - Fixed: FG/CoreRPG (Ver 4.5.10) breaking changes.

• GURPS 4e Ruleset v3.12.0 - 12th Mar 2024 (FG Unity Only)
  - Fixed: Minor FG/CoreRPG (Ver 4.5) breaking changes.
  - Added: Ability to output Traits, Abilities, Items, Vehicles, and Notes to the chat window.
  - Other: Refactored ruleset code bring it inline with FG/CoreRPG changes.

• GURPS 4e Ruleset v3.11.1 - 9th Mar 2024 (FG Unity Only)
  - Fixed: FG/CoreRPG (Ver 4.5) breaking changes.

• GURPS 4e Ruleset v3.10.3 - 19th Nov 2023 (FG Unity Only)
  - Fixed: FG/CoreRPG breaking changes.
  - Fixed: Inventory location equip/unequip.

• GURPS 4e Ruleset v3.10.2 - 19th Jun 2023 (FG Unity Only)
  - Fixed: Formatting issue with effects window.

• GURPS 4e Ruleset v3.10.1 - 15th Jun 2023 (FG Unity Only)
  - Fixed: Script errors following the FG4.4 release.

• GURPS 4e Ruleset v3.10.0 - 11th Mar 2023 (FG Unity Only)
  (This update will make changes to the campaign database. If concerned, backup your campaign folder before applying)
  - Fixed: Several compatability issues with CoreRPG.
  - Fixed: Chat Window default position.
  - Fixed: Skill, Spell ability auto level calculations.
  - Added: Power, Other ability auto level calculations. (Accessible via the "Info/Detail" section icon)

• GURPS 4e Ruleset v3.9.2 - 22nd Oct 2022 (FG Unity Only)
  - Fixed: Client Combat Tracker script error issue.
  - Fixed: Dice placement issue.
  - Fixed: NPC tab order.
  - Added: GURPS No Dice optional extension to the ruleset forge update.

• GURPS 4e Ruleset v3.9.1 - 10th Jun 2022 (FG Unity Only)
  - Fixed: Language script error issue.
  - Added: Toolbar controls to enable/disable range modifiers on map pointers.

• GURPS 4e Ruleset v3.9.0 - 5th Jun 2022 (FG Unity Only)
  - Fixed: 12 point token facing on hex maps.
  - Added: Range modifier to map pointers.
  - Added: RoF changes to handle shotguns. (eg RoF 3x9)

• GURPS 4e Ruleset v3.8.2 - 18th Mar 2022 (FG Unity Only)
  - Fixed: a minor script warning.

• GURPS 4e Ruleset v3.8.1 - 14th Mar 2022 (FG Unity Only)
  - Fixed: issue with languages.

• GURPS 4e Ruleset v3.8.0 - 10th Mar 2022 (FG Unity Only)
  - Fixed: issue with inventory and encumbrance.
  - Other: refactored some code.

Im first!
Well done roonke!

Quote:

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Originally Posted by damned

Im first!
Well done roonke!

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Well technically second. ;) :p

WOOTERS!!!!

Thank you for your work. I will be checking it out. :D

Thank you Ronnke!

45 minutes and no yako2020? He can't have been that anxious for this new ruleset! ;)

Great work ronnke.

I've already found a bug. Fixing it now.

he wont see it because i had posted a reply on his post just a minute or two before ronnke did... Im sure he is not too far away... :)

Thanks Ronnke! I've just done a quick look through and it looks great. :D

This looks quite amazing. I haven't played Gurps in many many years, but now I want to again!

I did run into an error:
Script Error: [string "campaign/scripts/npc_main.lua"]:35: attempt to index global 'traits' (a nil value)

That was just by making, locking / unlocking an npc. Might be due to the fact that I run the test version. Just wanted give a heads up on this.


Great work sir!


Vires Animi

Quote:

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Originally Posted by ronnke

It's finally here (for first release). ...
Download from here:
https://www.dropbox.com/s/oi8xg07o9wroslm/GURPS.pak
...

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Thanks Ronnke! A quick question...if I am using the existing ruleset, can i just replace the .pak file with yours? Will it keep the current campaign, or should I start a new one (export, import etc)?

Quote:

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Originally Posted by seycyrus

Thanks Ronnke! A quick question...if I am using the existing ruleset, can i just replace the .pak file with yours? Will it keep the current campaign, or should I start a new one (export, import etc)?

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I would start a new campaign. Export the characters from the old campaign and then import into the new one. If you really must, then you can replace the .pak and load your campaign, but this may have unpredictable results. MAKE A BACKUP OF YOUR CAMPAIGN BEFORE TRYING THIS!

I will look at the migration/upgrade code for using your old campaigns in the days ahead.

Quote:

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Originally Posted by ronnke

...
I will look at the migration/upgrade code for using your old campaigns in the days ahead.

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Please don't let THAT take a priority over other, perhaps more important things. I could survive without it.

EDIT: On second thought, it would be useful to be able to pull in all the modifiers etc. I've created.

Thanks Ronnke you are the best!

Is anyone else having problems pulling in NPCs exported from GCA4?

Quote:

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Originally Posted by viresanimi

This looks quite amazing. I haven't played Gurps in many many years, but now I want to again!

I did run into an error:
Script Error: [string "campaign/scripts/npc_main.lua"]:35: attempt to index global 'traits' (a nil value)

That was just by making, locking / unlocking an npc. Might be due to the fact that I run the test version. Just wanted give a heads up on this.


Great work sir!


Vires Animi

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Script error fixed!

The new GURPS.pak can be downloaded from the original link.

Quote:

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Originally Posted by seycyrus

Is anyone else having problems pulling in NPCs exported from GCA4?

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You wont be able to import NPC's from GCA until Saithan's script, which does the export, has been modified to then new NPC data format.

Quote:

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Originally Posted by ronnke

You wont be able to import NPC's from GCA until Saithan's script, which does the export, has been modified to then new NPC data format.

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Nod! I think he might need to modiy the PC export as well. Inventory is not being populated. btw, this is looking really nice!

Quote:

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Originally Posted by seycyrus

Nod! I think he might need to modiy the PC export as well. Inventory is not being populated. btw, this is looking really nice!

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The inventory should import correctly. I have on several occasions. can you send me the file you are trying to import.

So here it is. Kudos to you!

Certainly! Here it is.

Quote:

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Originally Posted by seycyrus

Certainly! Here it is.

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That imported fine for me.

Quote:

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Originally Posted by ronnke

That imported fine for me.

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Hrm, here is a screenshot of the error I get as I import. The front tab looks good. But some of the others are not populated, notably the inventory. (And I don't know how to paste from the FG clipboard, evidently!)

Trenloe, Damned I was just late because of problems with my internet, but now I'm here and very happy with Ronnke's great work.Now I can start the campaign and of course I will translate this ruleset into my native language.

Quote:

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Originally Posted by seycyrus

Hrm, here is a screenshot of the error I get as I import. The front tab looks good. But some of the others are not populated, notably the inventory. (And I don't know how to paste from the FG clipboard, evidently!)

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I made a few changes.

Download the .pak and try again.

@Ronke. Thanks for your prompt attention. I'll try things out when I get back from some travel tomorrow.

I have a doubt, have how to apply the damage directly, ie rolling the damage and decrementing the targets hit points or I have to adjust through the CTRL + Mouse Scroll

Quote:

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Originally Posted by yako2020

I have a doubt, have how to apply the damage directly, ie rolling the damage and decrementing the targets hit points or I have to adjust through the CTRL + Mouse Scroll

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You have to manually alter the targets hit points, you can edit directly using keyboard, or CTRL + Mouse Scroll.

Any sort of automation is a grey area with regards to the SJG Online policy. I would like to get permission from SJG to add some limited automation.

You can make the fields so that you can drop positive and negative numbers on them and they'll adjust. SJG can't copyright basic mathematics.

Posted a new update to the ruleset. See OP for details.

Quote:

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Originally Posted by Andraax

You can make the fields so that you can drop positive and negative numbers on them and they'll adjust. SJG can't copyright basic mathematics.

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That's currently available in the latest release.

I created some languages as a game master, and then I connected to test in the player's view and in the languages part I wrote one of the languages, but I can not select it in the chat to understand or speak in that language, the problem of selecting language is in the Part of the player.

I have a doubt automations such as decreasing ammunition can not be made?
Another question is that those modifiers of damage, cut, punch, etc. can not be applied automatically to the damage roll, as well as apply the DR of the target in this damage roll?

Quote:

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Originally Posted by yako2020

I have a doubt automations such as decreasing ammunition can not be made?
Another question is that those modifiers of damage, cut, punch, etc. can not be applied automatically to the damage roll, as well as apply the DR of the target in this damage roll?

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Counting ammunition would be unreasonably complicated for a small amount of convenience, in my opinion. The entry for a weapon includes maximum rate of fire, but the attacker may choose to use less than the maximum. A whole system of declaring how much of the maximum rate is being used on each individual attack would have to be built, and you'd just be shifting the burden of keeping track of your own ammo to the burden of having to specify in the application how many rounds you want to use, so it can track for you.

About automatic damage application, we discussed this during playtest and it was pointed out that since there is no calculation of DR, the amount of damage applied would only be correct for an unarmored opponent. In addition to that problem, directly applying the damage from the roll would also ignore any advantages that alter or negate the effects of certain damage types. For example, creatures with "Homogenous" do not take extra damage from piercing or cutting attacks.

Also, as Ronnke mentioned, both of these features would count as automation and require special permission from SJG to avoid violating their current policy.

Hello Ronnke,
I downloaded the file today and am putting it through its paces right now. I did discover a "minor" nit right off the bat purely by accident...

I used the Traveller Add on for FG2, primarily because it was easier to view for my player whose eyes, like mine, are a wee bit older than *cough* 50 years of age. When chatting in the window for chatting, it seems that the Traveller Add on doesn't fit perfectly in the chat box when using your GURPS set up. No biggie to be honest with you. What I did to fix the issue was remove the TRAVELLER add on (skin?) from consideration and it worked JUUUuuuuuust fine.

I grabbed a character import and found myself having to look a bit to find where the character was located, because of the differences between your version and the one I had been using. Once I finally figured it out, SWEET! :)

I'm old and set in my ways, I'll admit, but thus far, my exploration of the new set up is going smoothly, for which I want to say "Thank you". I almost feel disloyal to the person who originally did the GURPS rules set up - but truth be told, were it not for the original work done on this, I'd have never purchased FG2 in the first place. Your addition gives me some more options to play with, and I want to say to both of you gentlemen "THANK YOU! for both of your work involved in getting GURPS up and running in FG2".

I'm wondering why the Language add on for GURPS didn't show up, but that is likely MY fault rather than anything else. In all... you've helped make a man a little happier in life. :)

:)

:)

I will have a look at the languages issue and release v3.0.2 in a day or two. I'll give people time to report any other issues.

Quote:

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Originally Posted by ronnke

I will have a look at the languages issue and release v3.0.2 in a day or two. I'll give people time to report any other issues.

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First off...

YOU have a life outside of the internet.

Secondly...

Don't rush to fix issues - just collect them and pick a different date to work on it. Surely you need a break! (and no - please no.... "Stop calling me Shirley" responses! *snicker*)

Thanks Guy.

Hal

Adding New possible "flaw"

Dodge is equal to movement+3. I'm noticing that the dodge values for characters seem to be 1 higher than they should be for encumbrance values greater than unencumbered. I checked to see if the character had combat reflexes or not, and found that it did not. So, I'm thinking that maybe I missed something here at my end.

Addenda to post: I loaded up a fantasy fighter character who has combat reflexes. The program does take into account the combat reflexes for unencumbered (ie the Dodge value is correct for unencumbered) but is higher by 1, what the dodge values should be for any other encumbrance levels.

Quote:

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Originally Posted by HalC

Adding New possible "flaw"

Dodge is equal to movement+3. I'm noticing that the dodge values for characters seem to be 1 higher than they should be for encumbrance values greater than unencumbered. I checked to see if the character had combat reflexes or not, and found that it did not. So, I'm thinking that maybe I missed something here at my end.

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Your Dodge is calculated based off your basic move, and then is -1 per encumbrance level. It is not calculated on your encumbered move.

Quote:

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Originally Posted by ronnke

That's currently available in the latest release.

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Doesn't seem to work. I just tried dropping numbers onto the "HP" field in the CT and it ignored them.

You can do a number of calculations directly in the chat window (apply DR manually, and halve or double the result) - now if I could just drop that result onto a "wounds" fields in the CT, that is all that is needed. Addition and subtraction of a field value *cannot* be copyrighted by SJG, especially if it's a field they do not even define.

Incidentally, this is the appropriate code in the C&C ruleset:

Code:

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                        <number_ct_crosslink name="wounds">
                                <anchored to="rightanchor" width="30" height="20">
                                        <top />
                                        <right anchor="left" relation="relative" offset="-10" />
                                </anchored>
                                <hideonvalue value="0" />
                                <tabtarget prev="nonlethal" next="init" />
                                <script>
                                        function handleDrop(draginfo)
                                                if draginfo.getType() == "number" then
                                                        local node = window.getDatabaseNode();
                                                        local rActor = ActorManager.getActorFromCT(node);
                                                        ActionDamage.applyDamage(nil, rActor, CombatManager.isCTHidden(node), "number", draginfo.getDescription(), draginfo.getNumberData());
                                                end
                                        end

                                        function update()
                                                window.onHealthChanged();
                                        end
                                </script>
                        </number_ct_crosslink>

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