Vegetable yield calculator
A 12 square metre tomato bed at 4.5 kilograms per square metre should give about 54 kilograms of fruit: the calculator multiplies planted area by the yield rate and converts units before you order seed or promise a share. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Area
- 12
- Yield rate
- 4.5
- Crop
- tomato
- Area unit
- m2
- Yield rate unit
- kg_per_m2
- Weight unit
- Kg
- Area m2
- 12
A vegetable yield calculator turns a planted bed into an expected harvest weight before you order seed, staff a pick, or promise a CSA share. Enter the bed area, the yield rate for the crop you chose, and optional units; the solver converts area and rate into square metres and kilograms per square metre with fixed international-foot and avoirdupois constants, multiplies them, and returns the expected yield in the weight unit you asked for, plus the same mass in kilograms and pounds.
What expected vegetable harvest means and how area times rate becomes weight
Expected vegetable harvest is the product of how much ground you actually planted and how much crop that ground is expected to return per square unit. A twelve square metre tomato bed at four and a half kilograms per square metre is fifty-four kilograms of fruit; the same bed at two kilograms per square metre is twenty-four kilograms. That identity is what market growers, school gardens, and backyard planners mean when they search for a vegetable yield calculator.
Bed area is the planted surface, not the whole yard: subtract paths, unused corners, and the thickness of timber walls so you do not count soil you never sowed. Yield rate is the harvest mass you expect from one square unit of that planted surface for the chosen crop, taken from last year's pick sheets, a seed-catalogue estimate, or an extension bulletin. Units must match or be converted: multiplying square feet by kilograms per square metre silently invents a harvest that no kitchen scale will ever show.
This solver converts area into square metres and yield rate into kilograms per square metre, multiplies those SI values, then converts the product into kilograms, grams, pounds, ounces, or metric tonnes as requested. The crop name is a label on the result only; it does not change the arithmetic. Weather, pests, irrigation, variety, and successive plantings still sit outside the formula.
What you get is the expected yield weight implied by the two numbers you trust, not a forecast of next August, and zero or negative area or rate is refused because those values are not a harvest plan.
Who plans harvests with it, and its limits
Market gardens use a vegetable yield calculator to turn bed maps into crate counts before hiring pickers or promising wholesale boxes. Home growers sizing a raised bed against a seed packet need the same product so a four-by-eight bed at a published pounds-per-square-foot rate becomes a pantry number, not a guess. Failed validation does not consume balance.
Keep requests small, pin the rounded masses in tests, and you get reproducible harvest weights for farm software, LMS plugins, and edge workers without standing up a crop-model service of your own. This landing is not a weather-adjusted forecast, not a fertilizer recommendation, not a plant-spacing designer, and not a soil-fill volume tool—those are different search intents.
Prefer this capability when you already know area and a yield rate and only need the expected harvest weight; if you only have bed length, width, and wall height, compute planted area first, then convert.
What you can do with it
Market garden crate planning
Turn mapped bed area and last season's kilograms per square metre into an expected harvest weight before you staff a pick or quote a wholesale box.
Home raised-bed pantry estimates
Convert a backyard bed in square feet and a seed-packet pounds-per-square-foot rate into expected pounds, kilograms, and grams for canning plans.
FAQ
What happens if area or yield rate is zero or negative?
A harvest plan requires a strictly positive bed area and a strictly positive yield rate; those failures are not billed.
Which area and yield units can I use?
Area: m2 (default), sqft, sqyd, acre, ha. Weight: kg (default), g, lb, oz, t.
Does the calculator include weather, pests, or germination losses?
No. It multiplies the area and yield rate you supply after unit conversion. Adjust the rate yourself if you want a conservative or optimistic scenario.
How much will a 12 square metre tomato bed yield?
At 4.5 kilograms per square metre it gives 54 kilograms of fruit; at 2 kilograms per square metre the same bed gives 24. The harvest is simply the planted area times the yield rate.
Should I measure the whole garden or only the bed?
Only the planted surface. Subtract paths, unused corners and the thickness of timber walls, so you do not count soil you never sowed and overestimate the harvest.
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/bio/vegetable-yield \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"area":12,"yield_rate":4.5}'const res = await fetch("https://api.kit.forhosting.com/bio/vegetable-yield", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"area": 12,
"yield_rate": 4.5
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/bio/vegetable-yield",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"area": 12,
"yield_rate": 4.5
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/bio/vegetable-yield", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"area":12,"yield_rate":4.5}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"area":12,"yield_rate":4.5}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/bio/vegetable-yield", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"area": 12,
"yield_rate": 4.5
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "bio.vegetable_yield",
"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.
Limits
max_abs | 1000000000 |
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
Area and yield rate must both be finite and strictly positive: a zero-width bed or a negative rate is rejected with invalid_input instead of a silent empty harvest.
Input contract, supported units, response shape, and error behaviour
Optional crop is a short text label such as tomato or lettuce. Crop is omitted when you did not send it. Conversion uses the international foot (zero point three zero four eight metres) and the avoirdupois pound (zero point four five three five nine two three seven kilograms). POST a JSON body with two required finite positive numbers: area, the planted bed surface, and yield_rate, the expected mass per square unit for the crop. Optional area_unit is one of m2 (default), sqft, sqyd, acre, or ha. Optional yield_rate_unit is one of kg_per_m2 (default), g_per_m2, lb_per_sqft, kg_per_sqft, lb_per_acre, or t_per_ha. Optional weight_unit is one of kg (default), g, lb, oz, or t. Each numeric field may arrive as a JSON number or as a numeric string; booleans, empty strings, missing fields, and non-finite tokens fail with invalid_input naming the field. If area is zero or negative, or if yield_rate is zero or negative, the task fails with a clear message that the field must be a finite positive number—those failures are not billed. On success the body echoes the inputs and chosen units, reports area_m2 and yield_rate_kg_per_m2 after conversion, and returns expected_yield in weight_unit plus expected_yield_kg and expected_yield_lb so a seed packet, a CSA sheet, and a kitchen scale can be compared without a second conversion. Example: area twelve, yield_rate four point five, crop tomato, defaults for units, yields fifty-four kilograms. Absolute values above one billion are rejected so IEEE doubles stay finite.
Where a vegetable yield API earns its keep, and what it will not pretend to know
Classroom and community plots use the endpoint as a deterministic oracle: students submit area and rate, and the grader checks expected_yield without a spreadsheet that quietly changes units. Round-trip intuition is easy: expected_yield_kg divided by area_m2 recovers yield_rate_kg_per_m2 within the same twelve-decimal rounding.
Integration use cases
School garden and CSA worksheets
Let students or members submit area, yield rate, and crop name and check a deterministic expected_yield instead of a spreadsheet that silently mixes units.
Technical questions
How do I calculate expected vegetable harvest from bed area?
Send a finite positive area and a finite positive yield_rate for the crop. The API converts both into square metres and kilograms per square metre, multiplies them, and returns expected_yield in your weight_unit plus kilograms and pounds.
What does the vegetable yield calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.