Skip to content
KhetiTools
EN हिं

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.

NPK Urea DAP Seed Rate
Calculators
46
State bigha sizes
11
Cost to use
₹0

NPK Calculator

2 acres · wheat

N

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 field

Most used

See all 46
NPK Calculator Convert an N:P:K recommendation into kilograms and bags of urea, DAP or SSP, and MOP for your field. Urea Calculator Find out how much urea to buy for your field from the nitrogen dose, in kilograms and 45 kg bags. DAP Calculator Calculate DAP needed from your phosphorus (P₂O₅) dose, plus the nitrogen it supplies and the number of 50 kg bags. Seed Rate Calculator Calculate how many kilograms of seed you need per acre from spacing, 1000-seed weight, germination and purity. Plant Population Calculator Count how many plants fit in your field for any spacing – rectangular, square or triangular planting. Crop Yield Calculator Estimate total crop yield and yield per acre from a small harvested sample (crop cutting method). Pesticide Dilution Calculator Convert the label dose into ml or grams per tank, total product and the number of tank fills for your field. Irrigation Water Requirement Calculator Estimate crop water need with ET₀ and crop coefficient, then convert it to litres and pumping hours for your field. Acre to Hectare Converter Convert acres to hectares instantly. 1 acre = 0.4047 hectare. Includes a quick conversion table.

Browse by task

Calculator categories

Fertilizer 7 tools Crop 4 tools Seed 3 tools Spray 3 tools Irrigation 3 tools Soil 2 tools Farm 2 tools Land & Unit Conversion 6 tools Dairy & Livestock 3 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

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

  1. 1

    Pick a tool

    Search or tap a category – fertilizer, seed, spray, irrigation or land.

  2. 2

    Fill in a few boxes

    Usually just two or three numbers, in units you already know: acre, bigha, guntha, kg or quintal.

  3. 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.

Open the NPK calculator
Fertilizer bags stacked at a village dealer

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.

Convert bigha to acre
Farm fields divided by bunds seen from above

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.

Mix a spray tank
Farmer spraying a crop with a knapsack sprayer

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.

Calculate crop water
Drip irrigation lines in a vegetable field

Fresh

Recently added

Mandi Arbitrage & Transport Cost Calculator PMFBY Crop Insurance Calculator KCC Loan Limit & Interest Calculator Nursery Seedling Tray Calculator

Learn the method

Farming guides

All guides

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.