Tree benefits calculator
Ten street trees at 22 kg of CO2 and 118 kg of oxygen each per year absorb 220 kg of CO2 and release 1180 kg of oxygen. Enter your count and rates to get a yearly figure anyone can check. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Tree count
- 10
- Co2 per tree
- 22
- Oxygen per tree
- 118
- Total co2 kg
- 220
- Total oxygen kg
- 1,180
- Equation
- 10 × 22 = 220 kg CO2/year; 10 × 118 = 1180 kg O2/year
Planting trees is one of the most cited climate and air-quality actions a household, school, city, or NGO can take, yet the annual benefit is easy to overstate or understate when a single viral kilogram figure is quoted without showing the count or the rates behind it. This tree planting benefits calculator estimates yearly carbon dioxide absorbed and oxygen released from three numbers you already have: how many trees you plant or already tend, how many kilograms of CO2 each tree absorbs in a year, and how many kilograms of oxygen each tree releases in a year. Totals are the product of the count and each per-tree rate. Zero trees is valid and returns zero benefits.
Where the yearly CO2 and oxygen figures come from
Each tree takes in carbon dioxide and gives off oxygen as it grows, and published urban-forestry tables or species fact sheets express that as kilograms per tree per year. This calculator does not guess those rates for you: you supply them, along with how many trees you plant or already look after. It then multiplies the count by each rate. Ten street trees at 22 kg of CO2 and 118 kg of oxygen each give 220 kg of CO2 absorbed and 1180 kg of oxygen released in a year. Because the arithmetic is visible, anyone reading a school project or a climate report can check it.
Common mistakes when quoting tree benefits
The most frequent error is quoting a single viral kilogram figure without the tree count or the rate behind it, which makes the claim impossible to verify. Keep the rate fixed from one fact sheet and change only the number of seedlings, so campaign pages and reports stay consistent from one year to the next. Mixing units is the second trap: both rates must be kilograms per tree per year. Finally, this is a yearly estimate for the trees you enter; if your method needs tree losses, trunk growth or a comparison with cars, apply those factors to the totals afterwards.
Where a tree planting benefits calculator earns its keep
Municipal tree offices use a tree planting benefits calculator so a proposed street-tree count times published kilograms-per-tree rates becomes a yearly CO2 and oxygen total they can drop into a climate action report without opening a spreadsheet of unit conversions. Failed validation does not consume balance. Keep requests small, pin the rounded yearly kilogram figures in tests, and you get reproducible tree-benefit estimates for homework, LMS plugins, sustainability scripts, and edge workers without standing up forestry software of your own.
If a protocol later needs mortality, diameter growth, or a car-equivalent conversion, apply those factors to the returned masses rather than asking this calculator to invent them.
What you can do with it
NGO reforestation dashboards
Hold species rates fixed from a fact sheet and swap only the seedling count so campaign pages always show consistent yearly CO2 absorbed and oxygen released.
FAQ
What units should I use for CO2 and oxygen?
Totals are then kilograms per year. Convert pounds or tonnes to kilograms before you call, so every client shares one unit.
How much CO2 do 10 trees absorb in a year?
With a rate of 22 kg of CO2 per tree per year, 10 trees absorb 220 kg. At 118 kg of oxygen per tree they also release 1180 kg of oxygen over the same year.
Where do I get the per-tree CO2 and oxygen rates?
From a published urban-forestry table, a fact sheet for your species or your own measurements. The calculator does not pick a rate for you, so the source you cite is the one your result rests on.
Does the result account for trees that die or keep growing?
No. It multiplies the count by the rates you enter. If your method needs losses, trunk growth or a comparison with cars, apply those factors to the yearly totals the calculator returns.
Can I enter zero trees or a fractional count?
Yes. Zero trees is valid and returns zero kilograms of both benefits, and averages such as 12.5 equivalent trees are accepted. Only negative numbers are refused, because you cannot plant a negative stand.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/eco/tree-benefits \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"tree_count":10,"co2_per_tree":22,"oxygen_per_tree":118}'const res = await fetch("https://api.kit.forhosting.com/eco/tree-benefits", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"tree_count": 10,
"co2_per_tree": 22,
"oxygen_per_tree": 118
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/eco/tree-benefits",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"tree_count": 10,
"co2_per_tree": 22,
"oxygen_per_tree": 118
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/eco/tree-benefits", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"tree_count":10,"co2_per_tree":22,"oxygen_per_tree":118}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"tree_count":10,"co2_per_tree":22,"oxygen_per_tree":118}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/eco/tree-benefits", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"tree_count": 10,
"co2_per_tree": 22,
"oxygen_per_tree": 118
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "eco.tree_benefits",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
A negative tree count is rejected as invalid_input because you cannot plant a negative stand.
What annual tree benefits are and how the linear identity works
Annual tree benefits in this calculator are the yearly mass of carbon dioxide a stand absorbs and the yearly mass of oxygen it releases, estimated from a head-count of trees and two per-tree rates you supply. Ten mature street trees at twenty-two kilograms of CO2 and one hundred eighteen kilograms of oxygen each year therefore yield two hundred twenty kilograms of CO2 absorbed and one thousand one hundred eighty kilograms of oxygen released over the year. Zero trees is a valid input and returns zero kilograms of both benefits, which is the correct result for an empty planting year or a scenario that has not yet broken ground. Urban forestry tables, species fact sheets, and NGO planting kits publish those rates in kilograms per tree per year; they vary with species, age, climate, and management, which is why this endpoint does not hide a single viral constant inside the code. You send tree_count, the number of trees planted or already standing, co2_per_tree, kilograms of carbon dioxide absorbed by one tree in a year, and oxygen_per_tree, kilograms of oxygen released by one tree in a year. The linear identities are total_co2_kg equals tree_count times co2_per_tree, and total_oxygen_kg equals tree_count times oxygen_per_tree. The endpoint does not grow a diameter, does not discount for mortality, does not convert kilograms to car-kilometre equivalents, and does not call a species database; those layers sit outside this multiply and should be applied in your own bookkeeping if a protocol requires them.
Input contract, aliases, and what happens when tree count is negative
Negative per-tree rates are likewise rejected, because a benefit rate cannot be a source under this linear model. Zero is valid on any factor and returns zero kilograms on the corresponding total, which is the correct result for an empty stand or a placeholder rate of zero. Example: ten trees times twenty-two kilograms of CO2 per tree is two hundred twenty kilograms of CO2 per year, and ten times one hundred eighteen kilograms of oxygen is one thousand one hundred eighty kilograms of oxygen per year. POST a JSON body with three required finite numbers: tree_count, the number of trees in the stand; co2_per_tree, kilograms of carbon dioxide absorbed by one tree in one year; and oxygen_per_tree, kilograms of oxygen released by one tree in one year. Accepted aliases for the count are trees, n_trees, count, and n. Accepted aliases for the carbon rate are co2, co2_absorbed, co2_kg_per_tree, carbon_per_tree, and co2_absorbed_per_tree. Accepted aliases for the oxygen rate are oxygen, o2, oxygen_released, oxygen_kg_per_tree, o2_per_tree, and oxygen_released_per_tree. Each field may arrive as a JSON number or as a decimal numeric string. Missing fields, empty strings, non-finite values, and magnitudes beyond the supported absolute ceiling fail with invalid_input naming the field. A negative tree_count is rejected because you cannot plant a negative stand; the error message states that the field cannot be negative and the request is not billed. On success the body echoes the cleaned tree_count, co2_per_tree, and oxygen_per_tree, reports total_co2_kg and total_oxygen_kg as the yearly masses, and includes formula and equation strings for display.
Where a tree planting benefits calculator earns its keep
School climate labs and journalism desks need a deterministic oracle that rejects a negative tree count as invalid_input instead of returning a hollow success with a negative mass that a buggy pipeline might accept as a credit. NGO reforestation dashboards often hold the per-tree rates fixed from a species sheet and vary only the number of seedlings; calling a tiny parse API avoids pulling a desktop workbook for a three-factor multiply.
Integration use cases
Municipal climate-action reports
Multiply a proposed street-tree count by published kg CO2 and kg O2 per tree per year and record total_co2_kg plus total_oxygen_kg for the annual inventory.
School and journalism estimates
Let students or reporters vary tree_count and the two per-tree rates, then verify that yearly CO2 and oxygen equal count times each rate.
Technical questions
How do I estimate annual tree planting benefits?
Send finite numbers tree_count (non-negative), co2_per_tree, and oxygen_per_tree in kilograms per tree per year. The API returns total_co2_kg = tree_count × co2_per_tree and total_oxygen_kg = tree_count × oxygen_per_tree.
What happens if tree count is negative?
The task fails with invalid_input. You cannot plant a negative stand, so a negative tree_count is rejected and is not billed.
Can I use published per-tree rates from a forestry table?
Yes. Supply the table values as co2_per_tree and oxygen_per_tree. This calculator does not look up a species; it multiplies the rates you bring, so two campaigns with different tables stay comparable only if they use the same sheet.
What does the tree benefits calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.