Quick answer
A common estimate is 0.060 metric tons of CO₂ per urban tree seedling over 10 years and 1.00 metric ton per acre of US forest per year. Planting 100 seedlings removes about 6 metric tons of CO₂ (1.638 t of carbon) over 10 years.
Enter the number of seedlings, acres of forest and years. The calculator returns the CO₂ removed. Use this tree carbon uptake estimate calculator to check your own figures.
Related tools: Carbon Footprint Estimate Calculator: Annual greenhouse-gas emissions from driving, home electricity and natural gas using US EPA emission factors. Recycling Rate Calculator: Share of waste that is recycled or diverted. Wind Power Estimate Calculator: Power from a wind turbine rotor at a wind speed.
How to use the Tree Carbon Uptake Estimate Calculator
- Enter urban tree seedlings planted and grown for 10 years (a whole number, between 0 and 1000000). It starts at 0.
- Enter acres of US forest (0 or more). It starts at 0.
- Enter years of forest growth (between 0 and 200). It starts at 1.
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Urban tree seedlings planted and grown for 10 years | A whole number | ≥ 0, ≤ 1000000, starts at 0 |
| Acres of US forest | A number | ≥ 0, starts at 0 |
| Years of forest growth | A number | ≥ 0, ≤ 200, starts at 1 |
Formula and method
Formula
seedlings: 0.060 metric tons CO₂ each over 10 years; forest: 1.00 metric ton CO₂ per acre per year
IEEE-754 double precision; shown to at most 6 decimal places.
Uses the US EPA equivalency factors: one urban tree seedling grown for 10 years sequesters 0.060 metric tons of CO₂, and one acre of average US forest sequesters about 1.00 metric ton of CO₂ per year (2022 inventory). These are averages across regions and species; growth depends on species, climate, site and survival, and the seedling factor is the total over the 10 years, not a yearly rate.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Urban tree seedlings planted and grown for 10 years = 100; Acres of US forest = 0; Years of forest growth = 1.
| Result | Value |
|---|---|
| Carbon dioxide removed | 6 metric tons CO₂ |
| From seedlings (10 years) | 6 t |
| From forest land | 0 t |
| As carbon (C) | 1.638 t C |
Example 2
Inputs: Urban tree seedlings planted and grown for 10 years = 0; Acres of US forest = 50; Years of forest growth = 10.
| Result | Value |
|---|---|
| Carbon dioxide removed | 500 metric tons CO₂ |
| From seedlings (10 years) | 0 t |
| From forest land | 500 t |
| As carbon (C) | 136.461 t C |
Example 3
Inputs: Urban tree seedlings planted and grown for 10 years = 25; Acres of US forest = 12.5; Years of forest growth = 30.
| Result | Value |
|---|---|
| Carbon dioxide removed | 376.5 metric tons CO₂ |
| From seedlings (10 years) | 1.5 t |
| From forest land | 375 t |
| As carbon (C) | 102.755 t C |
The first line is the headline result (carbon dioxide removed). Below it the tree Carbon Uptake Estimate Calculator lists from seedlings (10 years), from forest land and as carbon (C), which describe the same case from other angles. IEEE-754 double precision; shown to at most 6 decimal places.
Factors
The EPA equivalencies give 0.060 t CO₂ per seedling grown for 10 years; this tool uses an average of 1.00 t per acre per year for forest. Carbon is 12/44 of CO₂ by mass, so 6 t CO₂ is 1.64 t C.
Use with care
These are national averages; actual uptake depends on species, climate, survival and age. Seedling uptake covers only the first 10 years. Planting trees is not a complete substitute for cutting emissions.
How the result changes with urban tree seedlings planted and grown for 10 years
Holding every other input at the first worked example, this table changes only urban tree seedlings planted and grown for 10 years. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Urban tree seedlings planted and grown for 10 years | Carbon dioxide removed | From seedlings (10 years) | From forest land |
|---|---|---|---|
| 50 | 3 metric tons CO₂ | 3 t | 0 t |
| 100 | 6 metric tons CO₂ | 6 t | 0 t |
| 200 | 12 metric tons CO₂ | 12 t | 0 t |
| 400 | 24 metric tons CO₂ | 24 t | 0 t |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Urban tree seedlings planted and grown for 10 years: left empty shows "Enter urban tree seedlings planted and grown for 10 years." beside that field and no result.
Choosing between the Tree Carbon Uptake Estimate Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Carbon Footprint Estimate Calculator](/science/carbon-footprint-estimate-calculator/) | miles driven per year, electricity used per year and natural gas used per year | Estimated emissions |
| [Recycling Rate Calculator](/science/recycling-rate-calculator/) | recycled or diverted and total waste generated | Recycling rate |
| [Wind Power Estimate Calculator](/science/wind-power-estimate-calculator/) | rotor diameter, wind speed and power coefficient | Power |
| [Fuel Emissions Calculator](/science/fuel-emissions-calculator/) | fuel and fuel burned | CO₂ emitted |
| [Travel Emissions Calculator](/science/travel-emissions-calculator/) | distance traveled and emission factor | CO₂ emitted |
Background: environment and acoustics
Decibels are a logarithmic scale, so sound levels cannot be added arithmetically: two equal sources raise the level by about 3 dB, not double it. Environmental and emissions results depend on the factors behind them (for example the US EPA's equivalency factors), which are averages for a country, fuel and year.
Use the result to compare scenarios rather than as a measured value.
Assumptions and limitations
- Average factors only
- Seedling uptake is for the first 10 years of growth
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for urban tree seedlings planted and grown for 10 years to confirm this.
Frequently asked questions
How many trees offset a car?
A car emitting 4.6 t a year needs about 77 seedlings for 10 years.
Do older trees absorb more?
Yes. Larger, older trees store more carbon in total, though young fast-growing trees take up CO₂ quickly.
Is the carbon stored permanently?
Only while the tree stands.
What does the Tree Carbon Uptake Estimate Calculator calculate?
Carbon dioxide removed by planted tree seedlings and by forest land, using US EPA factors. It returns Carbon dioxide removed, From seedlings (10 years), From forest land and As carbon (C).
What formula does the Tree Carbon Uptake Estimate Calculator use?
seedlings: 0.060 metric tons CO₂ each over 10 years; forest: 1.00 metric ton CO₂ per acre per year. Uses the US EPA equivalency factors: one urban tree seedling grown for 10 years sequesters 0.060 metric tons of CO₂, and one acre of average US forest sequesters about 1.00 metric ton of CO₂ per year (2022 inventory).
What do I need to enter in the tree Carbon Uptake Estimate Calculator?
You enter Urban tree seedlings planted and grown for 10 years, Acres of US forest and Years of forest growth.
How is the result rounded or limited?
IEEE-754 double precision; shown to at most 6 decimal places. Average factors only.
What are the limits of this calculator?
Average factors only. Seedling uptake is for the first 10 years of growth.
What is an example of a tree Carbon Uptake Estimate result?
With urban tree seedlings planted and grown for 10 years 100, acres of US forest 0 and years of forest growth 1, the carbon dioxide removed is 6 metric tons CO₂.
Where does the method come from?
The method follows: US EPA, Greenhouse Gases Equivalencies Calculator – Calculations and References (https://www.epa.gov/energy/greenhouse-gases-equivalencies-calculator-calculations-and-references; public domain); McPherson et al. (2016) and US DOE (1998) for the seedling factor; EPA Inventory 2024, Chapter 6, for forest sequestration.
Related calculators
- Carbon Footprint Estimate Calculator — Annual greenhouse-gas emissions from driving, home electricity and natural gas using US EPA emission factors.
- Recycling Rate Calculator — Share of waste that is recycled or diverted.
- Wind Power Estimate Calculator — Power from a wind turbine rotor at a wind speed.
- Fuel Emissions Calculator — CO₂ from burning gasoline or diesel.
- Travel Emissions Calculator — CO₂ from a trip at an emission factor you enter.
- Dew Point Calculator — Dew point from temperature and relative humidity.
Sources
- US EPA, Greenhouse Gases Equivalencies Calculator – Calculations and References (https://www.epa.gov/energy/greenhouse-gases-equivalencies-calculator-calculations-and-references; public domain)
- McPherson et al. (2016) and US DOE (1998) for the seedling factor; EPA Inventory 2024, Chapter 6, for forest sequestration
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.