Coral Reef Restoration Cost Calculator

This calculator prices out coral reef restoration across four methods — coral gardening/fragmentation, larval seeding, artificial substrate deployment, and a comprehensive approach combining all three — each carrying a different base cost per hectare ($80,000 for larval seeding up to $350,000 for comprehensive work) and different fragment requirements (larval seeding needs none, since it relies on coral spawn rather than transplanted fragments). That base cost is then adjusted for site conditions: more degraded reefs (lower existing coral coverage) cost more to restore, cost climbs above a 5-meter baseline depth as diving logistics get harder, and cost rises with distance from the nearest boat launch. Coral gardening and comprehensive projects add a nursery setup cost that scales with area, and every method carries five years of post-restoration monitoring at roughly $15,000 plus $2,000 per hectare annually.

Expected survival rates differ sharply by method — larval seeding is the cheapest and lowest-establishment option at just 30%, while comprehensive restoration reaches 75% — and that survival rate feeds directly into the ecosystem-service payback estimate, which assumes restored reefs recover only half of a pristine reef's ecological value once functional. Time to a functional reef ranges from four years (comprehensive) to a full decade (larval seeding). Because underlying costs and survival rates are drawn from published averages rather than site-specific bids, treat every dollar figure as an order-of-magnitude planning estimate — actual restoration costs vary enormously by region, contractor, and reef condition, and a local marine restoration specialist should validate any real budget.