Cost estimates

Every dollar figure the thread produced, grouped by scale. Most are order-of-magnitude estimates by individual members, not engineering cost studies.

Key results

Demonstrators and testbeds

Item	Estimate	Source
Small inflatable torus in a Dragon trunk, instrumented	$10–15M	JasonAW3, 2015-02-22
Two DragonLabs joined by a solar-array lattice	<$50M	mikelepage, 2015-02-27
DragonLab on its F9 stage, 2–4 week animal experiment	~$100M per launch (+50% if NASA)	Paul451, 2015-11-08
AGRARIAN multi-arm rodent satellite (15–20 t)	$500M	A_M_Swallow, 2015-10-05
Scaled instrumented prototype or simulation	"a few million $"	lamontagne, 2022-10-13
Greenhouse capsule (CST-100 analogy)	>$1B	A_M_Swallow, 2015-09-02

Small crewed stations

• ZIP DUDE's 2 × BA330 at 0.38 g: $1.5B. BA330s with floors $400M; connector with flywheel and thrusters $500M; 3 FH $375M; other $225M ZIP DUDE, 2015-03-09.
• First stations as house-size inflatables: 2 modules, one g-level, <$2B redliox, 2015-10-04.
• A Node 3-like module: ~$1B in NASA dollars; commercially <$100M, maybe <$10M Coastal Ron, 2019-04-17.
• NAUTILUS-X: ~$3.7B for 6 crew (2011) LMT, 2023-09-17; LMT, 2023-10-02.
• mikelepage's first-generation metric: <$1.5B of launch, the size and cost of a Virginia-class Block V submarine mikelepage, 2022-10-14.
• Superyacht analogy: private spin-g yachts for low hundreds of $M mikelepage, 2022-10-20.
• Starship-module stations: each module on a stripped expendable Starship costs <$10M to launch, <$50M with the module InterestedEngineer, 2023-06-02.

Large stations and settlements

• Clarke Station at L1: ~$50B for development plus 5 years of operations Oli, 2014-11-30.
• A 1000-tourist station must cost only a few $B, since revenue is ≤$2B/yr lamontagne, 2022-10-16.
• lamontagne's Base5 concave Kalpana (10,000 people): budget ≤$1M per person, so ≤$50B total, needing automation and cheap energy lamontagne, 2023-02-16. JohnFornaro counters with ≥$10M per person, $50T+ JohnFornaro, 2023-02-16.
• JohnFornaro's ring: 284 sections × $1B JohnFornaro, 2022-10-17; 282 segments at ~$3B each? JohnFornaro, 2022-11-09.
• O'Neill (1974 Physics Today): $3M per colonist, which would need to drop to $300k lamontagne, 2023-01-25.
• Scale comparisons: Qatar World Cup $200B; world GDP ~$96T lamontagne, 2022-12-07. Montreal REM $7B over 7 years; C-Series 12 years lamontagne, 2022-10-13.

Operating costs

• ISS operations ~$3B/yr Paul451, 2015-02-20; ~$1B per person-year; seats ~$80M Genial Precis, 2022-09-07.
• ISS tourists ~$55M ≈ $7M/day JohnFornaro, 2022-12-31.
• Bigelow advertised a Dragon round trip to a BA330 at $51.25M A_M_Swallow, 2015-09-02.
• Launch pricing is covered in launch vehicles.
• Sun-pointing precession for JohnFornaro's ring: 3.5 Mt of propellant a year (~17,000 Starship deliveries) Twark_Main, 2023-09-09. In energy terms, ~$300k/yr at $0.02/kWh, but that framing is wrong (see sun-pointing) lamontagne, 2025-04-29.

Cost drivers identified

• Mass = cost at every scale Coastal Ron, 2019-03-24; Twark_Main, 2023-03-09. Pressure-vessel area and shielding dominate lamontagne, 2024-03-20.
• Commercialization weeds out architectures that are 3×–100× too massive Twark_Main, 2023-09-16.
• Crew time in orbit is costly, so outfit on the ground mikelepage, 2024-07-20.
• Interior outfitting at ISS-like density (100–150 kg/m³) dominates mass over the pressure structure Twark_Main, 2023-09-28.
• Food is >100× the largest power demand in a settlement lamontagne, 2023-01-28.

Open questions

• What does a Starship-era rotating station actually cost per person-year, compared with ISS's ~$1B?
• Could commercial pricing bring a Node-3-class module under $100M?

Related pages

• Business models · Funding and programs · Launch vehicles

Sources

Forum posts

• Oli, 2014-11-30 (reply #262): Clarke Station ~$50B. Post. Attachments: clarke_station.pdf, clarke_station_slides.pdf, tether_based.pdf, clarke_station.png, mars_ship.png.
• Paul451, 2015-02-20 (reply #300, 1 like): ISS ~$3B/yr. Post.
• JasonAW3, 2015-02-22 (reply #359): JasonAW3. Post.
• mikelepage, 2015-02-27 (reply #433): mikelepage. Post.
• ZIP DUDE, 2015-03-09 (reply #495): $1.5B breakdown. Post.
• A_M_Swallow, 2015-09-02 (reply #589): A_M_Swallow. Post.
• redliox, 2015-10-04 (reply #660): <$2B. Post.
• A_M_Swallow, 2015-10-05 (reply #669): A_M_Swallow. Post.
• Paul451, 2015-11-08 (reply #739): Paul451. Post.
• Coastal Ron, 2019-03-24 (reply #1383, 3 likes): Mass = cost. Post.
• Coastal Ron, 2019-04-17 (reply #1561): Node 3 cost. Post.
• Genial Precis, 2022-09-07 (reply #1759): ISS $1B/person-year. Post.
• lamontagne, 2022-10-13 (reply #2069, 1 like): Project analogies. Post.
• lamontagne, 2022-10-13 (reply #2072): lamontagne. Post.
• mikelepage, 2022-10-14 (reply #2077): First-gen metric. Post.
• lamontagne, 2022-10-16 (reply #2114): Few $B for 1000 tourists. Post.
• JohnFornaro, 2022-10-17 (reply #2123): 284 × $1B. Post.
• mikelepage, 2022-10-20 (reply #2155): Spin-g yachts. Post.
• JohnFornaro, 2022-11-09 (reply #2339): ~$3B segments. Post. Attachments: Ring-SK-006-Mirrors.jpg, Ring-SK-006-Mirrors.pdf, RingFP02-as-of-10-20-22.pdf.
• lamontagne, 2022-12-07 (reply #2571, 2 likes): $200B comparison. Post.
• JohnFornaro, 2022-12-31 (reply #2746): ISS tourist cost. Post.
• lamontagne, 2023-01-25 (reply #3107, 1 like): O'Neill costs. Post.
• lamontagne, 2023-01-28 (reply #3160): Food power demand. Post.
• lamontagne, 2023-02-16 (reply #3316, 1 like): ≤$1M/person. Post. Attachments: Base5cut.png, Base5front.png, Base5 housing.png.
• JohnFornaro, 2023-02-16 (reply #3318): ≥$10M/person. Post.
• Twark_Main, 2023-03-09 (reply #3532): Cost ∝ mass. Post.
• InterestedEngineer, 2023-06-02 (reply #3765): <$50M per module. Post.
• Twark_Main, 2023-09-09 (reply #3910): 3.5 Mt/yr. Post.
• Twark_Main, 2023-09-16 (reply #3949): Weeds out massive designs. Post.
• LMT, 2023-09-17 (reply #3961): NAUTILUS-X $3.7B. Post. Attachments: Holderman_2011_Slide9.png.
• Twark_Main, 2023-09-28 (reply #4037): Outfitting dominates. Post.
• LMT, 2023-10-02 (reply #4106): $3.7B. Post.
• lamontagne, 2024-03-20 (reply #4594, 1 like): Pressure vessel > shielding. Post. Attachments: costs.PNG, JBIS-v72-no09-September-October-2019_dk64ll.pdf.
• mikelepage, 2024-07-20 (reply #4652, 1 like): Crew time costly. Post.
• lamontagne, 2025-04-29 (reply #4914): 60 TJ/yr. Post. Attachments: EML-1 (1).xlsx.