BudgetGuessr project library

What the world’s biggest projects really cost

Compare published costs, timelines, project scale and original sources behind remarkable infrastructure and space missions.

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1733 projects

Budd built Universal Transit Vehicle as seen on the Baltimore Metro departing the Millford Mill Station.

Railway · United States

$917.9466 million

Baltimore - Metro Sections A and B

1987

Railway · India

INR 11.68 billion

Bangalore Green Line ? Nagasandra?Madavara extension

2024

Approximately $139.6 million

Railway · Thailand

THB 58.862 billion

Bangkok Green Line North ? Mo Chit to Khu Khot

2020

Approximately $1.73 billion

Railway · Spain

€70 million

Barcelona Metro L2 extension to Badalona Pompeu Fabra

2010

Approximately $92.8 million

Estación de Roquetes. Línea 3. Barcelona. España.

Railway · Spain

€156.5 million

Barcelona Metro L3 extension to Trinitat Nova

2008

Approximately $230.17 million

Estació El Coll - La Teixonera, L5 del Metro de Barcelona.

Railway · Spain

€311.4 million

Barcelona Metro L5 extension to Vall d'Hebron

2010

Approximately $351.78 million

Andana estació "Aeroport T1" de la Linia L9 del metro de Barcelona

Railway · Spain

€6.271 billion

Barcelona Metro L9/L10 network

2032

Approximately $7.09 billion

Railway · China

CNY 14.404 billion

Beijing Changping Line South Extension (Phase 1)

2024

Approximately $2 billion

Railway · Germany

DEM 105 million

Berlin U2 extension to Pankow

2000

Approximately $49.58 million

U-Bahn subway train route maps at Alexanderplatz Station in Berlin, Germany.

Railway · Germany

€525 million

Berlin U5–U55 connection

2021

Approximately $697.26 million

iss067e066735 (May 20, 2022) --- Boeing's CST-100 Starliner crew ship approaches the International Space Station on the company's Orbital Flight Test-2 mission before automatically docking to the Harmony module's forward port. The orbiting lab was flying 268 miles above the south Pacific at the time of this photograph.

Space mission · United States

$4.5561 billion

Boeing Starliner development

Railway · United States

$2.288 billion

Boston Green Line Extension

2022

Réseau bruxellois de métro (STIB) incluant la future ligne 3

Railway · Belgium

€4.7597 billion

Brussels Metro Line 3

Approximately $5.15 billion

Photo of the M1 platform of Piața Victoriei metro station, Bucharest, Romania showing the tactile paving for visually impaired pedestrians

Railway · Romania

RON 3.3 billion

Bucharest — Line 5

2020

Approximately $777.57 million

Railway · Hungary

HUF 452.5 billion

Budapest — Line 4

2014

Approximately $1.95 billion

Railway · China

CNY 19.1 billion

Changchun — Line 7 — Line 7 Phase 1

2020

Approximately $2.77 billion

Railway · China

CNY 17.484 billion

Chengdu — Line 9 — Line 9 Phase 1

2019

Approximately $2.53 billion

An Alstom Metropolis train-set at Guindy Metro station in Chennai.

Railway · India

INR 618.43 billion

Chennai — Phase 2

2026

Approximately $7.1 billion

Damen Station on the CTA Blue Line El train at Damen

Railway · United States

$198.9 million

Chicago - Blue Line O'Hare Airport Extension

1984

CTA Pink Line train in the State/Lake station. The train is pink to promote the new line.

Railway · United States

$482.6 million

Chicago - CTA Douglas Branch Rehab

2005

Kimball station at the terminus of the CTA brown line.

Railway · United States

$530 million

Chicago - Ravenswood (Brown) Capacity Exp

2004

Photo by Norma Fernandez of the Midway CTA station.

Railway · United States

$500 million

Chicago CTA - Southwest Orange Line

1993

Railway · China

CNY 20.046 billion

Chongqing — Line 5 — Line 5 Phase 1

2012

Approximately $3.18 billion

Railway · China

CNY 7.474 billion

Chongqing — Line 6 — Line 6 Branch (EXPO) Phase 2

2018

Approximately $1.13 billion