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100% free · very easy to use · no sign-up
Agriculture calculators for smarter farm planning
Pick a tool, fill in two or three boxes and press Calculate – that's it. Urea and DAP doses, seed rates, spray mixes, irrigation water and bigha to acre in seconds, in the units you already use. Free, with no registration.
- Calculators
- 54
- State bigha sizes
- 11
- Cost to use
- ₹0
NPK Calculator
2 acres · wheatN
50 kg/acre
P₂O₅
25 kg/acre
K₂O
12 kg/acre
Urea
174.9 kg4 bags
DAP
108.7 kg3 bags
MOP
40 kg1 bag
DAP already supplies 19.6 kg N, so less urea is needed.
Try it with your fieldMost used
Popular calculators
Guide
NPK Calculator
Convert an N:P:K recommendation into kilograms and bags of urea, DAP or SSP, and MOP for your field.
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Guide
Urea Calculator
Find out how much urea to buy for your field from the nitrogen dose, in kilograms and 45 kg bags.
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Guide
DAP Calculator
Calculate DAP needed from your phosphorus (P₂O₅) dose, plus the nitrogen it supplies and the number of 50 kg bags.
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Guide
Seed Rate Calculator
Calculate how many kilograms of seed you need per acre from spacing, 1000-seed weight, germination and purity.
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Guide
Plant Population Calculator
Count how many plants fit in your field for any spacing – rectangular, square or triangular planting.
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Guide
Crop Yield Calculator
Estimate total crop yield and yield per acre from a small harvested sample (crop cutting method).
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Guide
Pesticide Dilution Calculator
Convert the label dose into ml or grams per tank, total product and the number of tank fills for your field.
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Guide
Irrigation Water Requirement Calculator
Estimate crop water need with ET₀ and crop coefficient, then convert it to litres and pumping hours for your field.
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Guide
Acre to Hectare Converter
Convert acres to hectares instantly. 1 acre = 0.4047 hectare. Includes a quick conversion table.
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Calculator categories
Fertilizer
7 tools
Crop
4 tools
Seed
3 tools
Spray
5 tools
Irrigation
3 tools
Soil
2 tools
Farm
2 tools
Land & Unit Conversion
6 tools
Dairy & Livestock
9 tools
Machinery & Mechanization
3 tools
Post-Harvest & Storage
3 tools
Weather, Climate & Energy
2 tools
Protected Cultivation & Nursery
2 tools
Agri-Finance & Market
3 tools
Quick visual guides
Visual guides & infographics
Step-by-step visual cheat sheets showing measurements, formulas and outputs – easy to save or share on WhatsApp.
Dairy & Livestock
Cow Weight Calculator
Estimate cow, heifer, bull or buffalo weight from heart girth and body length using the proven tape measurement method.
Dairy & Livestock
Dairy Shed Size Calculator
Calculate covered roofed area, open paddock yard, manger length and water trough size for your cattle herd using BIS loose-housing standards.
Fertilizer
Urea Calculator
Find out how much urea to buy for your field from the nitrogen dose, in kilograms and 45 kg bags.
Irrigation
Drip Irrigation Calculator
Calculate drippers, lateral pipe length, system flow and how long to run your drip each day.
Estimate total crop yield and yield per acre from a small harvested sample (crop cutting method).
Dairy & Livestock
Ghee Calculator
Calculate how much ghee your cow or buffalo milk will yield, or how many litres of milk are required for 1 kg of pure ghee.
Why farmers use it
Honest maths, in your units
Fertilizer bags, spray tanks and land records don't all speak the same units. These tools do the conversion for you, then show every step so an agronomist, a dealer or your own notebook can double-check the answer.
- Free, no registration Open any tool and start. Nothing to install and no account needed.
- Made for phones Large buttons and results you can read in bright sunlight in the field.
- Indian farming units Acre, hectare, bigha, guntha, quintal – with state-wise bigha sizes.
- Formula shown Every result explains how it was worked out, step by step.
How it works
Three steps to an answer you can trust
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1
Pick a tool
Search or tap a category – fertilizer, seed, spray, irrigation or land.
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2
Fill in a few boxes
Usually just two or three numbers, in units you already know: acre, bigha, guntha, kg or quintal.
-
3
Get your answer, free
Large, clear numbers in seconds, with every step shown. No sign-up and no charges – ever.
Fertilizer planning
Know exactly how many bags to buy
Your Soil Health Card gives nutrients – kilograms of N, P and K. The dealer sells bags of urea, DAP and MOP. Our NPK calculator turns one into the other, and credits the nitrogen already in DAP so you don't pay for urea you don't need.
Land in your units
Bigha that matches your state
A bigha in Rajasthan is almost twice the size of one in West Bengal. Pick your state once and every calculator – fertilizer, seed, spray, irrigation – accepts your field size in local bigha.
Safe spraying
The right dose in every tank
Enter the dose from the product label and your sprayer size. You get millilitres per tank, the number of tank fills and the total product to buy – no bottle-cap guesswork, and never a dose we made up.
Irrigation
Water the crop, not the drain
Estimate what your crop actually uses from local weather and crop stage, then see the litres and pumping hours for your field. Planning drip? Work out drippers, lateral pipe and daily run time too.
Fresh
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Learn the method
Farming guides
Crop Protection
How to Mix Pesticide Correctly in a 16-Litre Sprayer
Label says "2 ml per litre" or "300 ml per acre"? Here's exactly how to work out the dose per tank, calibrate your sprayer and mix safely – without guesswork.
· 4 min read
Fertilizers & Nutrients
How to Calculate NPK Requirement from Your Soil Health Card
Your Soil Health Card has the numbers – here's how to read them, turn N:P:K doses into bags of fertilizer, and avoid the unit mix-ups that lead to over-application.
· 3 min read
Free kheti tools that anyone can use
KhetiTools is a set of free farming calculators made to be as easy as possible. Open a tool, type two or three numbers – your field size and the dose you want – and press Calculate. The answer comes back in large, clear numbers, ready to take to the dealer or the field. There is nothing to download, no account to create and nothing to pay.
Most decisions on a farm come down to a small calculation: how many bags of urea for this field, how much seed to buy, how many millilitres go in the sprayer, how long to run the pump. The maths isn't hard, but units get in the way – acres and hectares, kg per acre and kg per hectare, bigha that change size from state to state. Every tool here accepts the units you already use and shows each step of the working, so you can check it or explain it to someone else.
Made for the phone in your pocket
Every page loads quickly on a normal mobile connection, with big buttons and results you can read in bright sunlight. The whole site also works in Hindi – tap हिं at the top of any page.
A calculator, not a prescription
Our tools do arithmetic. How much fertilizer your crop needs or which pesticide to use depends on your soil, crop, variety, season and local conditions – follow your Soil Health Card, product labels and your Krishi Vigyan Kendra for the recommendation, and use these tools to turn it into accurate quantities. Have a farming question? Call or WhatsApp us.