Coral Reef Statistics 2026

REEF WITHOUT BORDERS — DATA & RESEARCH
Coral Reef Statistics 2026
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 reefs cover approximately 284,300 square kilometers of ocean floor — less than 1% of the total ocean area — yet support an estimated 25% of all known marine species. Roughly 50% of the world’s reef area has been lost since the 1950s. The 2023–2024 global bleaching event, the fourth on record, affected more than 60% 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 2023–2024 global bleaching event was the most severe on record, affecting 60%+ of reefs globally
• The Philippines holds roughly 27,000 km² of coral reef — only 22.8% is 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
• Successful restoration programs achieve coral survival rates of 60–90% in controlled conditions
• 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 was conducted by the Global Coral Reef Monitoring Network (GCRMN) and refined through satellite analysis by the World Resources Institute.
284,300
square kilometers of coral reef worldwide
GCRMN 2021
<1% of total ocean floor covered by coral reefs NOAA 109 countries and territories with coral reef systems REEF CHECK Reef Coverage by Region Region Estimated Reef Area (km²) Share of Global Total Status Southeast Asia (Coral Triangle) 101,000 35.5% Critical Pacific Ocean 69,000 24.3% Threatened Indian Ocean 36,000 12.7% Threatened Caribbean 26,000 9.1% Critical Middle East (Red Sea / Persian Gulf) 20,000 7.0% Threatened Australia (Great Barrier Reef) 20,000 7.0% Critical Atlantic Ocean 9,500 3.3% Critical Eastern Pacific 1,600 0.6% Threatened 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 Marine Biodiversity and the Coral Triangle Explained → 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. Decade Estimated Global Hard Coral Cover Change from Previous Decade Primary Driver 1950s (baseline) ~48–55% — Pre-mass-bleaching era 1970s ~40–45% -10 to -15% Coastal development, overfishing 1980s ~32–38% -15 to -20% First recorded mass bleaching events 1990s ~26–32% -15 to -20% 1998 global bleaching event (El Niño) 2000s ~22–28% -10 to -15% Continued warming, ocean acidification 2010s ~17–22% -15 to -20% 2015–2017 global bleaching event 2020–2024 ~14–20% -10 to -15% 2023–2024 record global bleaching event 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 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 60%+ of global reefs affected by the 2023–2024 bleaching event NOAA 2024 History of Global Mass Bleaching Events Year Event Reefs Affected Notable Impact 1998 1st Global Bleaching Event ~16% of global reefs Linked to El Niño; Indian Ocean and Caribbean hardest hit 2010 2nd Global Bleaching Event ~35% of global reefs Caribbean experienced worst bleaching on record at the time 2014–2017 3rd Global Bleaching Event ~75% of global reefs Great Barrier Reef suffered back-to-back bleaching in 2016 and 2017; longest event on record 2023–2024 4th Global Bleaching Event 60%+ of global reefs Most geographically widespread event ever recorded; declared by NOAA in April 2024 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.” Warming Scenario % of Reefs Bleaching Annually Projected Timeline Current trajectory (~1.2°C) ~60% per event (peak years) Now 1.5°C above pre-industrial 70–90% Projected 2030–2040 2.0°C above pre-industrial 99% Projected 2040–2050 Source: Hoegh-Guldberg et al. 2018 (Science); IPCC Special Report on 1.5°C 🔗 RELATED Coral bleaching explained: causes, effects and recovery → 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% of Philippine reefs rated in excellent condition DENR 2023 38.6% of Philippine reefs rated in poor or very poor condition DENR 2023 Philippine Reef Health Assessment Condition Rating % of Reef Area Hard Coral Cover Status Excellent 22.8% 75–100% Healthy Good 32.7% 50–74.9% Stable Fair 29.4% 25–49.9% Degraded Poor 15.1% <25% Critical 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 is conducting 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 2023–2024 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 State of Coral Reefs in the Philippines: 2026 Report → 🔗 RELATED See our first restoration 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 Value Category Annual Global Value Primary Beneficiaries Tourism and recreation $36 billion Coastal nations, dive industry Fisheries production $6.8 billion Commercial and subsistence fishers Coastal protection $9 billion Coastal communities, governments Biodiversity and existence value $100–300 billion Global (non-use value) Pharmaceutical research potential Unquantified Medical industry, global population Carbon cycling services Unquantified Global climate system 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 Taxonomic Group Estimated Reef-Associated Species Notable Statistic Hard corals (Scleractinia) 800+ 33% are listed as threatened by IUCN Reef fish 4,000+ 37% of all reef fish species in Coral Triangle Mollusks 4,000+ Include giant clams, octopuses, nudibranchs Echinoderms 700+ Sea urchins and starfish key to reef health Crustaceans 1,000+ Shrimps, crabs, lobsters reef-dependent Sea turtles 6 of 7 species All 6 reef-associated species are threatened Sharks 100+ Reef sharks critical as apex predators 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 Marine Biodiversity and the Coral Triangle Explained → 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. 60–90% coral survival rates achieved in well-managed nursery programs CORAL RESTORATION FOUNDATION 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 Metric Typical Range Best Practice Outcome Source Nursery survival rate 40–70% 70–90% Rinkevich 2014 Post-outplant survival (1 year) 30–60% 60–85% Boström-Einarsson et al. 2020 Post-outplant survival (3 years) 20–45% 50–70% Boström-Einarsson et al. 2020 Coral cover increase (5 years) 5–15% 20–35% NOAA Mission: Iconic Reefs Fragment growth to outplant size 6–18 months 6–9 months (fast-growing species) Multiple programs Cost per outplanted coral $0.40–$24 USD $0.40–$2.00 (scaled programs) Bayraktarov et al. 2016 Source: Boström-Einarsson et al. 2020 (PLOS ONE Meta-analysis of 832 restoration interventions); Bayraktarov et al. 2016 832 coral restoration interventions analyzed in the largest meta-analysis to date BOSTRöM-EINARSSON 2020 58 countries where coral restoration programs have been conducted IUCN 2021 🔗 RELATED How coral reef restoration works: a step-by-step guide → 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. Threat % of Global Reefs Affected Primary Region Severity Trend Ocean warming / coral bleaching 60%+ (peak events) Global Rapidly worsening Overfishing 55% Southeast Asia, Caribbean Worsening Coastal development / runoff 50% Southeast Asia, Caribbean Worsening Ocean acidification ~100% (gradual) Global Worsening Marine pollution / plastics ~45% Southeast Asia, Indian Ocean Worsening Destructive fishing (blast/cyanide) ~30% Southeast Asia Improving slowly Sedimentation ~25% Philippines, Caribbean Worsening Unsustainable tourism ~10% Red Sea, Caribbean, SE Asia Worsening Invasive species ~15% Indo-Pacific, Caribbean Stable 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 2023–2024 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? Approximately 284,300 square kilometers of coral reef remain worldwide, down from an estimated baseline of roughly 500,000–600,000 km² prior to significant human impact. The most current mapping, conducted by the GCRMN using satellite data and field surveys, places the figure at 284,300 km² as of 2020, though ongoing degradation means the current figure is likely lower. 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 2023–2024 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 meta-analysis of 832 coral restoration interventions across 58 countries found that nursery-grown coral fragments achieve survival rates of 60–90% in well-managed programs. 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? According to Philippine DENR assessments, only 22.8% of Philippine coral reefs are rated in excellent condition (75–100% live hard coral cover), while 32.7% are rated good (50–74.9% cover). The remaining 44.5% are rated fair or poor. The Central Visayas region, which includes Cebu Province where Reef Without Borders operates, 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 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. 2 Reefs at Risk Revisited — Burke, Reytar, Spalding & Perry, World Resources Institute (WRI), 2011. Global threat mapping of coral reef systems. 3 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. 4 A global analysis of coral bleaching over the past two decades — Sully et al., Nature Communications, 2019. 5 A coral restoration meta-analysis reveals factors that consistently increase outplant survival — Boström-Einarsson et al., PLOS ONE, 2020. Analysis of 832 restoration interventions across 58 countries. 6 Costs and Benefits of Coral Reef Ecosystem Services — Cesar, Burke & Pet-Soede, 2003. Primary source for $375 billion annual value estimate. 7 Coral Reef Ecosystems of the Coral Triangle — Coral Triangle Initiative on Coral Reefs, Fisheries and Food Security (CTI-CFF). 8 NOAA Coral Reef Watch — Bleaching alert system and historical bleaching event data. coralreefwatch.noaa.gov 9 IUCN Red List of Threatened Species — Coral species threat assessments. iucnredlist.org 10 Philippine Fisheries and Aquatic Resources Profile — Bureau of Fisheries and Aquatic Resources (BFAR), 2023. 11 Coral reefs and people in a high-CO2 world — Hoegh-Guldberg et al., Science, 2018. Source for warming scenario projections. 12 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 goes directly to field operations and science. FUND THE MISSION VOLUNTEER WITH US