Free tools for farmers
Calculators for starting out, and for the sums a growing season throws at you.
If you are starting a small farm, a market garden or a homestead, or just thinking about it, the first questions are practical. What will it cost to get going? How many plants fit in the beds? How many hens do we need? How much will it earn at a market stall? These tools answer those, with the working shown.
They also scale up. Every calculator works for hectares as well as garden beds, so a bigger farm can use the same tools for seed rate, fertiliser, irrigation, costs and machinery. You bring the numbers from your own bags, labels, invoices and records. The tools give estimates and general information, and they never tell you what rate or timing to use, because that depends on your crop, soil, animals, weather and local advice.
Made for farmers
Money & Pay
Farm Cost and Break-Even Calculator
Add up the cost per hectare or acre, then see the profit and the yield and price you need to break even.
Money & Pay
Machinery Cost per Hour Calculator
What a tractor or machine costs per hour and per hectare or acre, with the fixed costs spread over the hours.
Money & Pay
Small Farm and Garden Start-Up Cost Calculator
What it costs to start a small farm, market garden or homestead, and how long it takes to earn the money back.
Money & Pay
Garden Yield and Market Stall Income Calculator
The harvest from your garden beds and what you could earn selling it at a stall or the farm gate.
Money & Pay
Chicken Keeping Cost Calculator
What it costs to start keeping hens, step by step: coop, run, birds and kit, the space they need, and the yearly running cost.
Time & Dates
Planting and Harvest Date Calculator
Add days to maturity to a planting date to find the harvest date, or work back from the harvest to the date you must plant.
Quantities & Measurement
Seed Rate Calculator
Seeds to sow from row and plant spacing and germination, and the weight of seed to buy.
Quantities & Measurement
Fertiliser Product Calculator
Turn a nutrient rate into the amount of fertiliser product to buy, from the percentage on the label, and see the cost.
Quantities & Measurement
Irrigation Water Calculator
The volume of water for an area and a depth, allowing for efficiency, and how long the pump takes.
Quantities & Measurement
Garden Bed Plant and Seed Calculator
How many rows and plants fit in your beds, and how many seeds or packets to buy.
Quantities & Measurement
Animal Feed Calculator
How much feed your animals eat a month and a year, how many bags, and what it costs.
Quantities & Measurement
How Many Hens Do I Need? Egg Calculator
The number of hens for the eggs your household eats, or the eggs your hens will give you.
Quantities & Measurement
Rainwater Harvesting Calculator
How much water your roof can collect, how long it lasts, and the barrel or tank size for a dry spell.
How these fit the working year
Starting out
See what it costs to get going and how long until it pays back, measure the plot, and work out what the beds could earn.
🪴 Small Farm and Garden Start-Up Cost Calculator📐 Land Area Calculator🥕 Garden Yield and Market Stall Income Calculator
Keeping hens
Plan what it costs to start keeping chickens step by step, how many hens a household needs, and what their feed costs.
🐔 Chicken Keeping Cost Calculator🥚 How Many Hens Do I Need? Egg Calculator🐓 Animal Feed Calculator
Planting
Count how many plants fit in a bed, how many seeds to buy after germination, and when to plant to harvest on time.
🌱 Garden Bed Plant and Seed Calculator🌱 Planting and Harvest Date Calculator🌽 Seed Rate Calculator
Water
Find out how much rain your roof can collect and what size of barrel or tank you need, and how much water an irrigation pass takes.
🌧️ Rainwater Harvesting Calculator💧 Irrigation Water Calculator
Growing and buying inputs
Turn a nutrient rate into the fertiliser product to buy, and see what each hour on a tractor really costs.
🧪 Fertiliser Product Calculator🚜 Machinery Cost per Hour Calculator
Knowing your costs and prices
Add up the cost per hectare or acre, find your break-even yield and price, and compare prices over time.
🌾 Farm Cost and Break-Even Calculator⚖️ Break-Even Point Calculator💵 Historical Inflation Calculator% Percentage Calculator
More tools farmers use
Quantities & Measurement
Land Area Calculator
Area of a plot from its measurements, in acres, hectares, square feet and square metres. Rectangles, triangles, circles and any corners.
Money & Pay
Break-Even Point Calculator
How many units do you need to sell to cover your costs? Enter fixed costs, variable costs, and price.
Money & Pay
Percentage Calculator
Percentage increase, decrease, change and difference, plus X% of a number, discounts, tips, marks, weight loss, pay rises and win rate.
Time & Dates
Date Calculator
Add or subtract days from any date, or count the days between two dates.
Time & Dates
Week Number Calculator
Find the ISO week number for any date, with start and end dates for that week.
Time & Dates
Countdown Timer
Live countdown to any date or event, with a shareable link to send to your team.
Research & History
Historical Inflation Calculator
What was money worth in the past? US CPI data from 1913, UK RPI from 1948.
Research & History
Which Is Actually Bigger?
Compare any area, volume, weight, or length against real-world references: football pitches, Olympic pools, blue whales.
Questions
I am just starting out. Where do I begin?
Start with the start-up cost calculator to see what it takes to get going and whether it can pay back. Then measure your plot, see how many plants fit, and work out what the beds could earn.
Do these tools tell me how much fertiliser or seed to use?
No. They work out the arithmetic for the rate you choose, such as how much product supplies a nutrient rate or how many seeds give a plant count. The right rate depends on your crop, soil tests, variety and local advice, so ask your local extension service or an agronomist.
Are they only for small plots?
No. They are written with beginners in mind, but every calculator works at any size, from a few garden beds to hundreds of hectares.
Do they work in hectares and acres?
Yes. The tools have a units choice for metric (hectares, kilograms, litres) or imperial (acres, pounds, gallons), and the land area calculator shows acres, hectares, square metres and square feet together.
Is anything stored or sent?
The calculators run in your browser, so what you type stays on your device.
These are estimates and general information, not agronomic, financial or professional advice. Rates, timings and costs depend on your crop, land, weather and local rules.