Coral Reef Statistics 2026

REEF WITHOUT BORDERS — DATA & RESEARCH

The most comprehensive collection of coral reef data, updated for 2026. Every statistic is sourced from peer-reviewed research and leading marine science institutions.

LAST UPDATED: JUNE 2026 — SOURCES LISTED AT BOTTOM

• 50% of the world’s coral reefs lost since the 1950s
• 25% of all marine species depend on coral reefs
• 1B+ people rely on reefs for food and income
• $375B annual economic value of coral reef ecosystems

Jump to section:

1. Global Reef Coverage
2. Reef Loss by Decade
3. Coral Bleaching Statistics
4. Philippines Reef Statistics
5. Economic Value Statistics
6. Marine Biodiversity Statistics
7. Reef Restoration Statistics
8. Threats by Category
9. Frequently Asked Questions
10. Sources and Methodology

Coral reefs are among the most studied ecosystems on earth, and the data tells a consistent story: they are disappearing faster than at any point in recorded history, driven by a combination of local human pressures and global climate change. This page compiles the most current and authoritative statistics available on coral reef coverage, loss, bleaching, biodiversity, economic value, and restoration outcomes.

All figures are drawn from peer-reviewed scientific literature and reports published by leading marine science institutions. Where data ranges exist due to methodological differences between studies, we present the range rather than a single figure. We update this page annually as new data becomes available.

QUICK ANSWER: KEY CORAL REEF STATISTICS

Coral reef ecosystems cover approximately 348,000 square kilometers, of which only around 80,000 square kilometers is actual coral habitat — well under 1% of the total ocean area — yet they support an estimated 25% of all known marine species. Roughly 50% of the world’s reef area has been lost since the 1950s. The 2023–2025 global bleaching event, the fourth on record, affected 84% of the world’s reefs. At current rates of loss, projections suggest 70–90% of remaining reefs could experience severe degradation by 2050.

Key Takeaways

• Coral reefs cover less than 1% of the ocean floor but support approximately 25% of all marine species
• An estimated 50% of the world’s coral reefs have been lost since the 1950s
• The 2023–2025 global bleaching event was the most severe on record, affecting 84% of reefs globally
• The Philippines holds roughly 27,000 km² of coral reef, with weighted average hard coral cover of 22.8% and no surveyed station rated in excellent condition
• Coral reefs generate an estimated $375 billion to $1 trillion in economic value annually
• Over 1 billion people worldwide depend on coral reefs for food, income, or coastal protection
• Restored corals typically show survival around 60–70%
• At 1.5°C of global warming, 70–90% of remaining reefs are projected to experience severe bleaching annually

Global Coral Reef Coverage Statistics

Coral reefs are distributed primarily in a band between the Tropics of Cancer and Capricorn, where water temperatures remain consistently warm enough to support reef-building coral species. The most comprehensive mapping of global reef coverage to date was published in 2024 by Lyons and colleagues in Cell Reports Sustainability, combining Dove CubeSat and Sentinel-2 satellite imagery.

348,000 square kilometers of coral reef ecosystem worldwide, of which about 80,000 is coral habitat (LYONS ET AL. 2024)

<1% of total ocean floor covered by coral reefs (NOAA)

109 countries and territories with coral reef systems (REEF CHECK)

Reef Coverage by Region

Source: Global Coral Reef Monitoring Network (GCRMN) Status of Coral Reefs of the World 2020; Reef Check 2023 Annual Report

“The Coral Triangle alone contains 35% of the world’s reef area and 76% of all known coral species — making it the single most important marine region for global reef conservation.”

Related reading: Marine Biodiversity and Why It Matters: The Case for the Coral Triangle →

Coral Reef Loss Statistics by Decade

The loss of coral reef coverage over the past seven decades represents one of the most significant ecological changes in recorded natural history. The GCRMN’s 2020 Status Report, the most comprehensive global reef assessment ever conducted, synthesized data from 12,000 survey sites across 73 countries to produce the following historical loss estimates.

IMPORTANT NOTE ON DATA

Global reef loss figures vary between studies due to differences in methodology, survey coverage, and definitions of “healthy” versus “degraded” reef. The figures below represent the consensus range from peer-reviewed meta-analyses. Individual reef systems may show significantly different rates of change.

Source: GCRMN Status of Coral Reefs of the World 2020; Hughes et al. 2018 (Science); Bruno & Selig 2007 (PLOS ONE)

50% estimated global reef loss since the 1950s baseline (GCRMN 2020)

14% of the world’s coral lost in the 2009–2018 period alone (GCRMN 2020)

Related reading: Why Coral Reefs Are Dying Faster Than Ever →

Coral Bleaching Statistics

Coral bleaching — the stress response triggered when ocean temperatures rise above a coral’s thermal tolerance threshold — has become the defining ecological threat of the climate era. Mass bleaching events were scientific curiosities before 1980. They are now recurring crises affecting the majority of the world’s reefs.

1–2°C temperature rise above seasonal maximum needed to trigger bleaching (NOAA)

4 global mass bleaching events recorded since 1998 (GCRMN)

84% of global reefs affected by the 2023–2025 bleaching event (NOAA 2024)

History of Global Mass Bleaching Events

Source: NOAA Coral Reef Watch; Hughes et al. 2018 (Science); GCRMN 2021

Bleaching Frequency: Then and Now

25–30 yrs average interval between bleaching events before 1980 (HUGHES ET AL. 2018)

6 yrs average interval between bleaching events in the 1980s–1990s (HUGHES ET AL. 2018)

<2 yrs current average interval between bleaching events on many reefs (HUGHES ET AL. 2018)

“The time between bleaching events has collapsed from 25–30 years to less than 2 years — shorter than the recovery time for most coral species.”

Source: Hoegh-Guldberg et al. 2018 (Science); IPCC Special Report on 1.5°C

Related reading: Climate Change and Coral Bleaching Explained →

Philippines Coral Reef Statistics

The Philippines is one of the most reef-rich nations on earth and sits at the center of the Coral Triangle — the most biodiverse marine region in the world. It is also one of the most severely threatened. The following data is drawn from the Philippine Department of Environment and Natural Resources (DENR), the Bureau of Fisheries and Aquatic Resources (BFAR), and peer-reviewed assessments of Philippine reef health.

27,000 km² total coral reef area in the Philippines (BFAR)

22.8% weighted average hard coral cover across Philippine reefs (LICUANAN ET AL. 2019)

Over 90% of surveyed stations rated poor or fair, with none rated excellent (LICUANAN ET AL. 2017)

Philippine Reef Health Assessment

Source: Philippine DENR/EMB National Coral Reef Assessment; BFAR Fisheries Profile 2023

1.5M Filipino fisherfolk whose livelihoods depend on reef fisheries (BFAR)

$1.18B estimated annual economic value of Philippine coral reefs (BURKE ET AL. WRI)

Cebu and the Central Visayas

Cebu Province, where Reef Without Borders plans its first restoration mission at Kontiki, Mactan, sits within one of the most biodiverse and most threatened reef corridors in the Philippines. The reefs of Mactan Island have experienced significant degradation from coastal development, dynamite fishing in previous decades, and repeated bleaching events linked to the 2015–2017 and 2023–2025 global bleaching events.

500+ coral species recorded in Cebu reef systems (UP-MSI)

2,000+ reef fish species in the Central Visayas region (UP-MSI)

Q4 2026 Reef Without Borders first restoration mission at Kontiki, Mactan (RWB)

Related reading: The State of Coral Reefs in the Philippines: A 2026 Assessment →

Related reading: See our first mission site at Kontiki, Mactan, Cebu →

Economic Value of Coral Reefs

The economic value of coral reefs is consistently underestimated in policy discussions because much of it is not transacted in markets. Coastal protection, nutrient cycling, biodiversity maintenance, and the cultural value of reefs to indigenous and local communities are real economic goods that generate no direct market revenue but represent enormous value when lost.

$375B annual global economic value (conservative estimate) (CESAR ET AL.)

$1T+ annual global economic value (comprehensive estimate) (WRI)

$36B annual global reef tourism revenue (UNEP)

Source: Cesar, Burke & Pet-Soede 2003; Spalding et al. 2017; UNEP-WCMC 2018

$1.8B annual coastal flood protection provided by US coral reefs alone (USGS 2021)

$9.9B value of property protected by Florida’s coral reefs annually (USGS 2021)

Marine Biodiversity Statistics

The biodiversity concentrated in coral reef ecosystems is extraordinary relative to the area they occupy. Understanding these numbers helps explain why reef conservation is not just an environmental issue but a biological imperative with consequences for every ecosystem connected to the ocean.

800+ species of hard coral identified worldwide (IUCN)

4,000+ species of reef fish recorded globally (CORAL REEF ALLIANCE)

25% of all described marine species found in reef ecosystems (NOAA)

Source: IUCN Red List 2023; Coral Reef Alliance; GCRMN 2020

Coral Triangle Biodiversity

76% of all coral species found in the Coral Triangle (WWF)

37% of all reef fish species in the Coral Triangle (WWF)

120M people in Coral Triangle countries dependent on reef fisheries (CTI-CFF)

Related reading: Marine Biodiversity and Why It Matters: The Case for the Coral Triangle →

Coral Reef Restoration Statistics

Reef restoration is a young science by ecological standards — most programs have been running for less than 30 years — but the data on restoration outcomes is increasingly encouraging. Survival rates, growth rates, and ecological recovery metrics from well-managed programs demonstrate that active restoration can meaningfully accelerate reef recovery when combined with effective local threat management.

60–70% typical survival of restored corals (BOSTRÖM-EINARSSON ET AL. 2020)

2–4x faster growth rate in nursery vs natural reef conditions (MULTIPLE STUDIES)

100+ active coral restoration programs globally as of 2024 (IUCN)

Restoration Outcomes: What the Data Shows

A note on what is missing from this table. Earlier versions of this page gave separate “typical” and “best practice” figures for nursery survival, one-year and three-year outplant survival, and coral cover increase. We have removed those rows. The two-column structure did not come from the studies cited, and splitting a reported range into an ordinary half and an optimistic half is not something the underlying meta-analyses do. Long-term survival in particular is poorly established, because most projects stop monitoring before it can be measured.

Sources: Boström-Einarsson et al. 2020, PLOS ONE; Bayraktarov et al. 2016

Related reading: How Coral Reef Restoration Works: A Diver’s Guide to Rebuilding the Reef →

Threats to Coral Reefs by Category

Reef degradation is driven by a combination of local human pressures and global climate stressors. The relative impact of each threat varies by region, but the data consistently shows that local stressors weaken reefs’ resistance to global threats — making integrated management of both local and global drivers essential.

Source: Burke et al. 2011 (WRI Reefs at Risk Revisited); GCRMN 2020; Reef Check Annual Reports

Frequently Asked Questions

How much of the world’s coral reefs have been destroyed?

Estimates range from 40 to 50% of global reef coverage lost since the 1950s, with the GCRMN’s 2020 Status Report placing the figure at approximately 50%. The 2023–2025 bleaching event has likely pushed this figure higher, though updated global assessments are still being finalized. The Caribbean has experienced the most severe losses, with some regions losing more than 80% of coral cover since the 1970s.

How many coral reefs are left in the world?

The most current global mapping, published in 2024 using Dove CubeSat and Sentinel-2 satellite imagery, puts coral reef ecosystem area at approximately 348,000 km². Only around 80,000 km² of that is home to coral itself; the remainder is sand, rubble, seagrass and rock forming part of the reef system. Earlier estimates were lower largely because they mapped less, not because reef area has grown.

What percentage of coral reefs are endangered?

The IUCN assessed the status of coral reef ecosystems globally and found that a significant majority are under threat. More specifically, the IUCN Red List of Ecosystems classifies coral reef ecosystems across much of the tropics as Vulnerable, Endangered, or Critically Endangered. The World Resources Institute estimates that approximately 75% of the world’s remaining reefs are currently threatened by local and global pressures.

How fast are coral reefs dying?

The GCRMN’s 2020 analysis found that 14% of the world’s coral cover was lost in the single decade between 2009 and 2018 — primarily due to the 2015–2017 global bleaching event. At current rates, and factoring in the impact of the 2023–2025 bleaching event, the rate of loss is accelerating rather than stabilizing.

How many species live in coral reefs?

Coral reefs are estimated to be home to between 600,000 and 1 million species, though only a fraction of these have been formally described by science. The most commonly cited figure is that reefs support approximately 25% of all known marine species despite covering less than 1% of the ocean floor. This includes over 800 species of hard coral, 4,000+ species of reef fish, and tens of thousands of invertebrate species.

What is the economic value of coral reefs?

Estimates of the annual economic value of coral reefs range from $375 billion (Cesar, Burke & Pet-Soede 2003) to over $1 trillion (WRI comprehensive estimates) depending on what ecosystem services are included. Direct revenue from tourism alone exceeds $36 billion annually. In the Philippines, reef economic value is estimated at $1.18 billion per year.

Will coral reefs survive climate change?

The scientific consensus is that if warming is limited to 1.5°C above pre-industrial levels, a meaningful proportion of reef ecosystems may survive in degraded form, particularly heat-tolerant species and populations. At 2°C of warming, projections suggest that 99% of the world’s reefs would experience annual bleaching, making recovery effectively impossible without direct intervention. The survival of reef ecosystems as we know them is directly tied to global emissions trajectories.

How successful is coral reef restoration?

A 2020 systematic review of coral restoration found that reported survival of restored corals is typically around 60 to 70%, with a median restored area of just 100 square metres per project. Post-outplanting survival rates of 60–85% at one year are achievable under good conditions. The critical qualifier is that restoration cannot succeed in isolation — local threats including overfishing, pollution, and coastal runoff must be managed concurrently for restoration to produce lasting outcomes.

What percentage of the Philippines’ coral reefs are in good condition?

In the nationwide assessment of 166 stations published by Licuanan et al. in the Philippine Journal of Science (2017), more than 90% of stations were in the poor or fair categories, and none were classified in the excellent category. The weighted average hard coral cover was 22%, and a larger 2019 survey of 206 stations put it at 22.8%. The Central Visayas region, which includes Cebu Province where Reef Without Borders plans to operate, has experienced significant degradation from historical blast fishing and repeated bleaching events.

How many people depend on coral reefs?

The most widely cited estimate is that over 1 billion people worldwide benefit directly or indirectly from coral reefs. Of these, an estimated 500 million people in more than 100 countries depend on reefs for their primary food source and economic livelihood. In the Philippines alone, 1.5 million fisherfolk and their families depend on reef fisheries as their primary source of income and protein.

Sources and Methodology

Primary Sources

1. Global coral reef extent from satellite mapping — Lyons et al., Cell Reports Sustainability, 2024. Source for 348,000 km² of reef ecosystem and roughly 80,000 km² of coral habitat, mapped using Dove CubeSat and Sentinel-2 imagery.
2. Status of Coral Reefs of the World: 2020 — Global Coral Reef Monitoring Network (GCRMN). The most comprehensive global reef assessment ever conducted, based on data from 12,000 survey sites across 73 countries.
3. Reefs at Risk Revisited — Burke, Reytar, Spalding & Perry, World Resources Institute (WRI), 2011. Global threat mapping of coral reef systems.
4. Spatial and Temporal Patterns of Mass Bleaching of Corals in the Anthropocene — Hughes et al., Science, 2018. Foundational study on bleaching frequency and severity trends.
5. A global analysis of coral bleaching over the past two decades — Sully et al., Nature Communications, 2019.
6. Coral restoration: a systematic review of current methods, successes, failures and future directions — Boström-Einarsson et al., PLOS ONE, 2020.
7. Costs and Benefits of Coral Reef Ecosystem Services — Cesar, Burke & Pet-Soede, 2003. Primary source for $375 billion annual value estimate.
8. Coral Reef Ecosystems of the Coral Triangle — Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security (CTI-CFF).
9. NOAA Coral Reef Watch — Bleaching alert system and historical bleaching event data. coralreefwatch.noaa.gov
10. IUCN Red List of Threatened Species — Coral species threat assessments. iucnredlist.org
11. Philippine Fisheries and Aquatic Resources Profile — Bureau of Fisheries and Aquatic Resources (BFAR), 2023.
12. Coral reefs and people in a high-CO2 world — Hoegh-Guldberg et al., Science, 2018. Source for warming scenario projections.
13. The value of coastal wetlands for flood damage reduction in the continental US — USGS / Narayan et al., 2021.

Methodology note: Where figures vary between studies, we present the range and cite primary sources. Statistics marked with source badges are directly attributable to the named institution or publication. We update this page annually each January. If you identify an error or have a more recent authoritative source, please contact us at info@reefwithoutborders.org.

The Data Is Clear. The Window Is Still Open.

Reef Without Borders is a 501(c)(3) nonprofit launching its first coral restoration mission at Kontiki, Mactan, Cebu in Q4 2026. Every contribution will go directly to field operations and science.

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