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Calcimator

Seagrass Restoration Calculator

Plan seagrass restoration projects: estimate shoot requirements, labor, costs, carbon sequestration, and ecosystem service value.

Inputs

%

Results

Total shoots needed

41,667

Labor hours required1,388.9
Total project cost ($)$97,223.00
Cost per m² ($/m²)$97.22
Annual CO₂ sequestered (kg)182.8
Ecosystem services ($/yr)$1,140.00
How to Use This Calculator
  1. Enter the target restoration area in square meters.
  2. Set the planting density in shoots per square meter (typically 1-4 shoots/m² for transplants).
  3. Input the source area harvest rate (shoots per m² removed) to protect donor beds.
  4. Review the total shoot count needed, donor area required, and estimated cost.
  5. Monitor transplant survival at 30, 60, and 90 days post-planting to assess success.

How the result changes with Expected survival rate (%)

Expected survival rate (%)Total shoots needed
15166,667
3865,790
6737,314
9127,473

What each input means

Target restoration area (m²)
Total area to be restored with seagrass coverage.
Planting density (shoots/m²)
Initial planting density. Typical: 10-25 for Zostera marina, 15-40 for Thalassia testudinum.
Expected survival rate (%)
Expected first-year survival rate. Varies 20-80% depending on site conditions and methods.
Cost per shoot ($)
Cost per shoot/planting unit including harvest and preparation. Typically $0.50-$5.00.
Labor cost ($/hr)
Hourly labor rate for divers or planting crew.
Shoots planted per hour
Average planting rate per person per hour. Varies 15-60 depending on method and conditions.

What each result means

Total shoots needed
Total shoots to plant, accounting for expected mortality to achieve target density.
Labor hours required
Estimated person-hours for planting.
Total project cost ($)
Combined material and labor costs.
Cost per m² ($/m²)
Average cost per square meter of restored area.
Annual CO₂ sequestered (kg)
Estimated annual CO₂ sequestration from restored seagrass (based on 83 g C/m²/yr).
Ecosystem services ($/yr)
Estimated annual ecosystem service value at $19,000/hectare/year (Costanza et al.).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Target restoration area (m²) = 1000, Planting density (shoots/m²) = 25, Expected survival rate (%) = 60, Cost per shoot ($) = 1.5 = 6 input(s) provided
  2. Calculate Total shoots needed
    Total shoots needed = ceil(shootsForTarget / survivingFraction)
    41667 = 41667
  3. Calculate Labor hours required
    Labor hours required = totalShootsNeeded / shootsPlantedPerHour
    1388.9 = 1388.9
  4. Calculate Total project cost
    Total project cost = materialCost + laborCost
    97223 = $97,223

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