Calculation tools

This page lists various fan-made tools that can help calculations related to the gameplay of Kerbal Space Program. Unlike addons, they do not directly influence the game, as they are run separately.

The table cells that are shaded blue are links to the KSP Forums, to indicate open source tools and compatibility with the latest version of KSP. Conversely, tools who's last known compatible version is too far into the past are shaded red as are non-free tools and websites gone missing.

The KSP forums have a section dedicated to such tools here, which is where it is most likely that new tools and versions will be announced.

How hard is rocket science anyway?

Online tools and calculators

Orbit and maneuver calculators

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Forum post	Link
KSP Visual Calculator	Blaarkies	Interactively visualizes communication networks by placing and dragging satellites around a KSP map	2021		MIT License, GitHub-repo	forum post	https://ksp-visual-calculator.blaarkies.com/
Sat-Net Spacing Calc	jwarner87	Calculates deployment orbit for an evenly spaced satellite network in a single launch bundle. Supports alternate sized solar systems.	24 April 2016	1.0.5	Based on Ens-Gijs spreadsheet.		https://jwarner3412.github.io/kerbility/
Interactive illustrated interplanetary guide and calculator	Olex	Calculates Δv and angles for orbital transfer between celestial bodies	2013	0.22	Based on this forum post	forum post	http://ksp.olex.biz/
Launch Window Planner	alexmoon	Provides a total Δv calculation for orbital transfer based on launch parameters	6 Apr 2014	0.23.5	open source (License: CC BY-NC-SA 4.0)	forum post	http://alexmoon.github.io/ksp/
KSP Aerobraking Calculator	alterbaron	Calculates a maneuver to perform the intended aerobraking	20 Nov 2013	0.90	open source	forum post	http://alterbaron.github.io/ksp_aerocalc/
Kerb Calculator	Abeck	Calculates Δv based on fuel remaining in stage. Really useful if you're already in flight. New coming soon!	06 Feb 2016 (V0.2)	1.0.5	MATLAB .m file	forum post	Get it at the forum post
Lead angle calculator	Tuupertunut	Calculates the lead angle to reach a target orbit	6 Sept 2018				https://instacalc.com/51180
Resonance orbit calculator		Calculates periapsis based on orbit height and the requested orbital resonance			based on wiki information and this forum post		http://www.ksp.interrutt.com/
Simple Orbital calculating spreadsheet	drewmacrae	Detailed calculation spreadsheet for Hohmann transfer orbits	21 Mar 2012		See forum post for usage details	forum post	Google Docs link
Browser based orbit calculator	cjameshuff	Interactive orbit shape and property calculator	18 Jul 2011			forum post	http://files.arklyffe.com/orbcalc.html
Satellite Deployment Calculator	Ens Gijs	Makes precisely deploying evenly spaced satellites easy!	8 Aug 2015		Protected spreadsheet, you are free to edit any YELLOW fields.		Google Docs link
KSP Orbital Sooper Calculator	madbadger2742	Mutli-functional calculator including satellite arrangements	4 Dec 2013		Google Docs spreadsheet - Usage details on the first page of the spreadsheet	forum post	Google Docs link
Orbit Night/Darkness, Req. Battery Capacity, Satellite Relay Coverage	Peppe	Calculate orbital darkness time and corresponding battery capacity needed	9 Oct 2013		Google Docs spreadsheet	forum post	Google Docs link
KSP Un-Orbiter Caclulator	SharpCoder	Calculate roughly when to burn retrograde to achieve the most efficient landing	20 Oct 2016			forum post	http://sharpcoder.github.io/KspUnorbiter/

Part and construction calculators

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Forum post	Link
Reusable Rocket Calculator	cy4n	Calculates the cost to put 1 ton of payload into orbit on any given launcher.	31 Oct 2016	1.2	Google Docs spreadsheet		Google Docs link
Rocket Calculator	avylazyboy	Calculates and saves values for DeltaV, Isp, Thrust, and TWR for multi-stage rockets	7 July 2016	1.1.3	Open Source, written in C#	forum post	https://github.com/AveryPratt/RocketCalculator
kspalculator		Determines the best rocket propulsion designs for one stage of a rocket, given a set of constraints and preferences	8 Aug 2016	1.3	Open Source, written in Python	forum post	https://kspalculator.appspot.com/
KSP Optimal Rocket Calculator	GaryCourt	Generates a rocket design optimized for the given parameters	6 May 2015	1.2	open source (License: permissive)	forum post	http://garycourt.github.io/korc/
KSP Optimal Rocket Calculator Updated Version	MJungnickel	Generates a rocket design optimized for the given parameters	17 September 2021	1.12.2	open source (License: permissive)		https://mjungnickel18.github.io/korc/
KSP Parachute Calculator	check	Calculates the needed mass and type of parachutes for landers	19 Sep 2013	0.21.1		forum post	http://ksp.freeiz.com/
Engine Cluster Calculator	blizzy	Generates an engine layout for a given payload (asparagus staging)	8 Apr 2014	0.23.5	Based on this forum post		http://blizzy.de/asparagus/
KSP Calculator	Cameron Hessler	Escape velocity and stage Δv calculators	2012	0.16			http://www.kerbalspacecalculator.net16.net/index.php
Thrust calculator		Calculate TWR based on engines, fuel, payload and gravity					http://iyates.co.uk/ThrustCalc/
KSP Planner	eschatonic	Staged rocket planner and Δv calculator		0.22		reddit post	http://dhmholley.co.uk/ksplanner/
Craft Fixer	Ezriilc	Fixes duplicate ids in .craft files and can optionally remove add-on parts	27 Apr 2015	1.0		forum post	http://www.kerbaltek.com/craftkitchen
Delta-V Calculator	JellyGoggles	Calculates Δv per stage	15 Feb 2012	0.13.2	Google Docs spreadsheet	forum post	Google Docs link
Optimal Single-stage Lander Design Tool	tavert	Calculates engines and fuel needed for a single-stage landed based on payload	14 Dec 2013		Wolfram-based (Requires Wolfram CDF Player Plugin)	forum post	dropbox (.html)

Science

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Forum post	Link
KSP Science Calculator		Calculates amount of science gained in different environments		0.23 (see notes)	data based on the wiki article on science - Does not include Kerbol (16-04-2014)	reddit post	Google Drive link
Remaining Science	acalculus	Reads save file and displays remaining science for all celestial objects and experiments in a large table	5 May 2014	0.23.5	open source	forum post	http://kerbal-science-remaining.s3-website-us-east-1.amazonaws.com/
Simple Science Summary	Oarc	Provides an overview of science done and remaining based on a save file and science definitions file - support for mods that affect science [WIP]	27 Mar 2014	0.23.5	open source (entirely client-side javascript)	forum post	http://oarcinae.us/ScienceParser/kspScienceParser.html
Science Checklist	celem	Generates a table for each celestial body showing what science is available	6 Mar 2014	0.23.5	open source (entirely client-side javascript) (License: customized BSD, see forum post)	forum post	http://www.celemsoft.net/kspsci.html
KSP Checklist Generator	nobody44	Generates an simple online mission checklist including science gathering	14 Feb 2014	0.23 (version agnostic)	open source (License GPL v3)	forum post	http://pweingardt.github.io/kspchecklist/
Printable Complete Stock Science Checklists	JAFO	Spreadsheet with individually printable sheets for every body in the Kerbin system. Experiments which need to be performed more than once to obtain max science can be checked off twice.	12 Sept 2018	1.4.x	Includes versions for MS Office and Open/Libre Office.	forum post	https://drive.google.com/open?id=1boxrIH8NZt8sarvIzCwnEo-2KX-PdlOC
Jacke's KSP Science Checklists	Jacke	Spreadsheet with individually printable sheets for every body in the Kerbin system with all available experiments.	6 March 2019	1.6		forum post	https://www.dropbox.com/s/fj0bewwh7elea47/KSP-Jacke-Science_Checklists.20190306a..161.ods?dl=1

Deprecated

The tools in this table are known but are un-maintained, they websites are gone missing or the tools are too old to be relevant to recent versions of KSP

Deprecated tools

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Forum post	Link
Fairing Factory	Nathan Nifong	Generates a downloadable fairing based on the given design			non-functional (16-04-2014)	lost	http://nathannifong.com/FairingFactory/
Where can I go?	GavinZac	Calculates possible destinations based on given Δv			link dead (28-06-2020)	forum post	http://www.gavingolden.com/wherecanigo.php
MrFibble's KSP Calculators	MrFlibble1978	Tools to calculate information on orbits	Feb 2014	0.23	Dropbox link dead (28-06-2020)	steam community thread	Satellite Distribution Calculator Orbital Period Calculator KSP Multi Calculator
Delta V Calculator	interwound	Gives Δv required to reach a celestial body with or without a round trip			link dead (28-06-2020)		http://deltavmap.com/
Fuel Tank Calculator	opensesame11	Calculates the amount of fuel tanks for a given Δv	23 Oct 2013		link dead (17-04-2014)	forum post

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Offline applications

These tools can be downloaded and used offline. Keep in mind that the presence of an application here does not mean it has been tested or is otherwise trustworthy - apply reasonable caution when downloading and running the below applications. Generally, if something is widely used, it should be safe.

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Platform	Forum post	Link
KSP Trajectory Optimization Tool	Arrowstar	Contains tools for computing gravity assist maneuvers, rendezvous maneuvers, and full end-to-end mission planning with the Mission Architect and Launch Vehicle Designer tools.	20 Aug 2021		Requires MATLAB Runtime Compiler. See forum post for usage details.	Windows/Linux	forum post	https://github.com/Arrowstar/ksptot/
KSP Utilities	ROFLCopter64bit	Utility collection primarily for save file handling and analysis	4 Apr 2014	0.23.5	open source (License: LGPL v3+)	Windows (pre-compiled) (author reports partial cross-platforming from source)	forum post	(multiple downloads - see forum post)
KSP Rocket Calculator	VRGhost	Calculates rocket properties and aids in the design process	31 Oct 2012	0.17.1	open source	Python		(python script - use source)
De-orbit and Staged Ascent Simulators	Shane Colton	Calculate a de-orbit maneuver to land on a specific part of a celestial object - Evaluate whether a staged craft can reach orbit	22 Dec 2013	0.23	Scilab scripts	Scilab (see external tools section)	blog post	(see blog post for .sce files)
Zord's KSP Multi-calculator	Lord_Zord	Calculate Δv, effective Isp, TWR and acceleration	23 Feb 2014	0.23	binary and python components (License: MIT) - author informs that Avast AV gives a false positive with the file (16-04-2014)	Windows (possibly cross-platform, see downloads provided)	forum post	http://sourceforge.net/projects/zordskspcalc/
KSP Calculators	Jonv4n	Semi-major axis and orbital period calculations	18 Jul 2013	0.20.2	LibreOffice Calc and MS Excel spreadsheets	LibreOffice Calc (cross-platform) / MS Excel	forum post	(multiple downloads - see forum post)
Fix my docking	Alo	Finds and fixes bugs with docking ports from a quicksave	16 Apr 2014	0.23.5 (unclear)	open source (License: CC BY-NC-SA 4.0) - written in Pascal	Windows	forum post	dropbox (.exe)
Delta V Calculator	freeskier93	Calculates Δv for target celestial body with orbit height, inclination, angle and launch height are used to compute the final value	22 Mar 2014	0.23.5	open source (License: GPL v2) Matlab-based - large dependency (MCR)	Windows	forum post	dropbox (.exe)
KOrbit	SchildConstruct	Orbital calculator and plotter	28 Oct 2011	0.11.1	open source (License: Permissive) - inspired by Warringer	Windows	forum post	dropbox link (.msi) github downloads
Vessel Viewer	Chrison	Allows viewing of .craft files outside of KSP	4 Oct 2013	0.10.1	open source (License: GPL v3)	Windows	forum post	http://kerbalspaceport.com/ksp-vessel-viewer/
KSP Part Lister	cybutek	Lists parts used in .craft files	2 Sep 2012	0.16	open source (License: CC BY-NC-SA 3.0 GB)	Windows	forum post	http://cybutek.net/ksp/part_lister/1.0/KSP%20Part%20Lister%20v1.0.zip
Handy DV, TWR and orbital velocity Calc	pizzaboy150		25 Oct 2013			Windows	forum post	Google Drive (.exe)
Kerbal Tools	RockyTV	TWR, Δv and Isp calculator	15 Nov 2013			Google Chrome extension	forum post	Chrome Web Store
Transfer Stage Design Helper	RadHazard	Helps design interplanetary transfer stages	9 Oct 2013		open source (License: Permissive, included in forum post)	Java	forum post	dropbox link (.zip)
FireMarshal	draeath	For a given Δv and vessel information provides maneuver, fuel and mass change details	9 Jan 2014		open source (License: CC BY 4.0)	Python	forum post	(python script - use source)
Delta V Calculator	sneakytreesnake	Calculates Δv per stage	15 Jan 2014			MS Excel (.xlsx) (LibreOffice Calc can probably parse it as well)	forum post
Printable Complete Stock Science Checklists	JAFO	Spreadsheet with individually printable sheets for every body in the Kerbin system. Experiments which need to be performed more than once to obtain max science can be checked off twice.	07 Aug 2015	1.0.4	LibreOffice Calc and MS Excel spreadsheets	LibreOffice Calc (cross-platform) / MS Excel	forum post	https://app.box.com/s/rrb117aiuhubmb4e0fehtx12e9odp57a

Deprecated

Deprecated tools

Title	Developer	Description	Last Update	KSP Version compatibility	Notes	Platform	Forum post	Link
KSP Orbital Calculator	Warringer	Calculates orbital speeds for circular orbit injections			open source (License: LGPL)	Java	forum post	Google Code (zip file)
KSP Orbit Mechanic	WX_Echo	Optimizes orbits	19 Aug 2012			Java	forum post
Weight calc	zweerify	Calculates weight per stage	24 Oct 2011	0.11.1		.xls spreadsheet (can be parsed by MS Excel or LibreOffice Calc)	forum post	dropbox link (.zip)
KSP Orbit Calculator	Zeno	Calculates Δv and angles for orbital transfer between celestial bodies (see notes)	27 Jul 2013 (google play) - 12 Aug 2013 (source)	0.22 (see notes)	Android (2.3.3+)	based on Olex's calculator - open source (License: WTFPL])	forum post	Google Play link
KSP Orbit	Eric Meythaler	Calculates orbit characteristics	20 Jul 2011	0.8.5	Android (2.1+)			Google Play link
KSP Delta-V Calculator	Iodyne Labs	Calculates Δv per stage	10 Apr 2014	0.23.5	Android (4+)			Google Play link
KSP DeltaV Calculator	Julien Quartier	Calculates Δv required to reach celestial objects	2 Jan 2014	0.23	Android (2.2+)			Google Play link

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External tools not directly related to KSP

Online

Title	Developer	Description	Last Update	Notes	Forum post	Link
Delta-V Calculator and Rocket Simulator	Joe Strout	Calculate Δv - Simulate rocket flight	14 Oct 2009 - 29 Jan 2000	Intended for Earth-based craft - Java source available		Δv calculator Rocket simulator
Δv calculator for LEO/MEO/GEO injection	Eric Johnston (Satellite Signals)	Calculate Δv to transfer to various orbital levels based on initial low orbit	20 Nov 2013	Intended for Earth-based craft		delta-v-geo-injection-calculator.htm

Offline

Title	Developer	Description	Last Update	Notes	Platform	Forum post	Link
Scilab	Scilab Enterprises	General scientific computing software - contains aerospace and celestial mechanics modules (ATOMS)	2013	open source (License: CeCILL GPL-compatible) Can convert Matlab scripts to its own format	Cross-platform (Windows, MacOSX, GNU/Linux)		http://www.scilab.org/
GNU Octave	John W. Eaton (and others)	General scientific computing software - no specific related modules or packages, but might be preferable for some	2013	open source (License: GPL v3) Syntax is highly compatible with Matlab	Cross-platform (Windows, MacOSX, Unix/Unix-like)		http://www.gnu.org/software/octave/index.html
Sage	William A. Stein (and others)	General scientific computing software - utilizes other computational software as part of its backend	30 Jan 2014	open source (License: Multiple (FOSS)) Very practical for python users	MacOSX, Unix/Unix-like (binaries), Windows (virtualization)		http://www.sagemath.org/
Anaconda	Continuum Analytics	General scientific computing software - primarily a python scientific computing frontend	9 Apr 2014	(License: EULA) An alternative to Sage on Windows for python computing	Cross-platform (Windows, MacOSX, GNU/Linux)		https://www.anaconda.com/

See Also

• Tutorials