Tree Benefits Calculator
Quantify a tree's ecosystem services — CO2 sequestration, stormwater interception, cooling-energy savings and air-pollutant removal — using published i-Tree-style coefficients.
Air pollutants removed per year
| Pollutant | Removed (grams/yr) |
|---|---|
| Ozone (O₃) | — |
| Nitrogen dioxide (NO₂) | — |
| PM10 (coarse particles) | — |
| PM2.5 (fine particles) | — |
| Sulfur dioxide (SO₂) | — |
| Carbon monoxide (CO) | — |
Removal rates are the USDA Forest Service i-Tree Canopy urban multipliers per m² of tree cover (O₃ 5.404, NO₂ 0.700, PM10 1.534, PM2.5 0.276, SO₂ 0.344, CO 0.127 g/m²/yr).
Worked example
CO₂ sequestered: 98.6 kg/yr · CO₂ stored in wood: 3,348 kg · canopy 78.5 m² (10.0 m crown) · rainwater intercepted 14,137 L/yr · cooling saved 196 kWh/yr · air cleaned: O₃ 424 g, NO₂ 55 g, PM10 120 g, PM2.5 21.7 g, SO₂ 27 g, CO 10.0 g per year. Try it above — change the inputs and watch the numbers move.
Methodology & sources
Biomass & CO₂. Trunk diameter (DBH) → aboveground oven-dry biomass with the species-group equations of Jenkins et al. 2003, Forest Science 49(1):12–35 (bm = Exp(β₀ + β₁·ln(dbh_cm)); e.g. mixed hardwood β₀=−2.4800, β₁=2.4835; pine β₀=−2.5356, β₁=2.4349 — the basis of the U.S. greenhouse-gas inventory). Annual sequestration = biomass growth over one year of typical diameter increment × 0.5 (carbon fraction) × 44/12 (CO₂ per unit carbon).
Canopy. Crown diameter = species factor × DBH (typical 0.14–0.22 m per cm DBH); canopy area = π·(crown/2)².
Stormwater. Canopy area × annual zone rainfall × interception fraction — 15% for deciduous, 25% for evergreen — within the ranges measured by Xiao & McPherson 2002/2003 (15.3% small deciduous jacaranda … 66.5% mature evergreen in Santa Monica, CA).
Cooling energy. Canopy area × zone factor (1.0–2.5 kWh/m²/yr): an order-of-magnitude estimate for shade plus evapotranspiration cooling; real savings depend on building proximity and orientation.
Air quality. Canopy area × USDA Forest Service i-Tree Canopy urban removal multipliers (g/m² tree cover/yr).
Calculator-assumed values (disclosed): annual DBH growth per species group (0.5–1.0 cm/yr), crown-size factors, zone rainfall (450–2,500 mm/yr representative averages), zone cooling factors, and condition factors (good 1.0 / fair 0.85 / poor 0.70). These are typical-value approximations, not measurements of any particular tree.
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Frequently asked questions
What does the Tree Benefits Calculator estimate?
It estimates the annual ecosystem services of a tree in the style of the USDA Forest Service i-Tree models: CO2 sequestered per year, CO2 stored in its wood, rainwater intercepted by its canopy, cooling energy saved through shade and evapotranspiration, and air pollutants (O3, NO2, PM10, PM2.5, SO2, CO) removed from the air. Example: a 50 cm DBH oak in a subtropical climate sequesters about 98.6 kg of CO2 per year and intercepts about 14,137 liters of rainwater.
Where do the calculation coefficients come from?
Tree biomass comes from the allometric equations of Jenkins et al. 2003 (Forest Science 49(1):12-35), the basis of the U.S. greenhouse-gas inventory; air-pollutant removal rates are the urban multipliers of the USDA Forest Service i-Tree Canopy model (e.g. 5.404 g of O3 per m2 of tree cover per year); rainfall interception fractions (15% deciduous, 25% evergreen) follow the ranges measured by Xiao and McPherson 2002/2003. Annual diameter growth, crown-size factors, zone rainfall and cooling factors are calculator-assumed typical values, disclosed in the methodology section.
How is CO2 sequestration calculated?
The trunk diameter (DBH) is converted to aboveground biomass with the Jenkins 2003 equation bm = Exp(beta0 + beta1 x ln(dbh_cm)). The same equation is applied to next year's diameter (current DBH plus a typical annual growth increment per species group); the difference is the annual biomass increment, multiplied by 0.5 (carbon fraction) and 44/12 (CO2 per unit carbon). A 50 cm oak therefore stores about 3,348 kg of CO2 in its wood and adds about 98.6 kg of CO2 sequestration per year.
Can I use these results for carbon credits or official reporting?
No. These are educational estimates based on generalized coefficients, not measurements of your specific tree, and they are not valid for carbon-credit claims, offsets, or regulatory reporting. Official crediting requires certified methodologies (for example Verra or Gold Standard) with on-site verification. Real trees vary widely with climate, soil, health, and pruning.
How is the stormwater benefit estimated?
Canopy area is estimated from the trunk diameter, then multiplied by the zone's annual rainfall and an interception fraction: 15% for deciduous trees, 25% for evergreens, based on the ranges reported by Xiao and McPherson (15.3% for a small deciduous jacaranda up to 66.5% for a mature evergreen). A 50 cm oak with a 78.5 m2 canopy in a subtropical zone (1,200 mm rain) intercepts roughly 14,137 liters per year - about 47 bathtubs.
How are the air-quality numbers derived?
Each pollutant is the canopy area multiplied by the i-Tree Canopy urban removal multiplier: O3 5.404, NO2 0.700, PM10 1.534, PM2.5 0.276, SO2 0.344 and CO 0.127 grams per m2 of tree cover per year. A 50 cm oak (78.5 m2 canopy) therefore removes about 424 g of ozone, 55 g of nitrogen dioxide and 120 g of PM10 per year. Removal scales with leaf area, so bigger canopies clean more air.
How accurate are these estimates?
They are order-of-magnitude estimates. Actual services depend on species, age, health, crown shape, local climate, and surroundings - two trees with the same trunk diameter can differ substantially. The tree-condition setting (good/fair/poor) applies a simple 1.0/0.85/0.70 factor. For management-grade numbers, a field inventory run through i-Tree Eco is the proper tool; this calculator is for education and quick comparison.
How is this different from the Tree Value, Tree Age, Tree Diameter, and Basal Area calculators?
This tool quantifies ecological services in physical units (kg of CO2, liters of water, kWh, grams of pollutants) in the style of i-Tree. The Tree Value calculator estimates monetary value: amenity appraisal plus timber board-feet value. Tree Age estimates a tree's age from its diameter, Tree Diameter converts tape measurements and computes basal area per tree, and Basal Area estimates stand density in forestry units. Different questions, different tools.
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