Crop Water Footprint & The Water Hidden in Every Kilo
Reveals litres/kg
Enter total water used and yield to get the crop's water footprint — litres per kilogram and cubic metres per tonne.
Enter water used & yield
Next: benchmark 1,200 L/kg against typical figures (cereals ~1,500; rice ~2,500); cut it by improving yield or switching to drip/mulch to use less water per tonne.
m³/tonne ≡ L/kg. This is a blue+green water proxy; full footprint accounting also adds grey water (dilution of pollutants).
Crop water footprint — key facts
- Footprint
- Total water ÷ yield
- Units
- Litres per kg · m³ per tonne
- Lower is
- More water-productive
- Drip & mulch
- Lower the footprint
- Higher yield
- Lowers it for same water
- Virtual water
- Footprint carried in produce
- Use
- Compare crops & practices
- Privacy
- Runs in your browser; nothing uploaded
How many litres are in a kilo of your crop?
Every kilogram you harvest carries a hidden cost in water. The water footprint measures that cost directly — litres of water per kilogram of produce, or cubic metres per tonne — by dividing the water a crop used by the yield it returned. It is a fairer way to judge water use than litres alone, because a heavy-yielding field can be more water-productive than a thrifty one that barely produces. Comparing crops and practices on this basis is where real water savings are found.
This tool takes your total water used and your yield and returns the footprint in litres per kg and m³ per tonne. Use it to compare crops, varieties and irrigation methods, to track whether drip and mulching are paying off, and to understand the virtual water that travels with everything you grow. Pair it with the Water Use Efficiency, Crop ETc and Irrigation Efficiency tools to push your water productivity higher season after season.
Judge on output
Water per kilo, not just litres applied.
Compare fairly
Rank crops and methods on productivity.
Prove the savings
See if drip and mulch lower the footprint.
Understand virtual water
The water that travels with your produce.
Frequently Asked Questions
What is a crop water footprint?+
The water footprint is the amount of water used to produce a unit of crop — typically litres per kilogram of produce, or cubic metres per tonne. It links the water you put into a field to the food that comes out, so two crops or two farming methods can be compared on how productively they turn water into yield.
How is the water footprint calculated?+
Divide the total water used by the produce harvested. Total water (in litres) divided by yield (in kilograms) gives litres per kg; the same in cubic metres over tonnes gives m³ per tonne. This tool takes your water use and yield and reports both figures, so you can read it in whichever units suit your record-keeping.
What is a typical water footprint for crops?+
It varies enormously by crop and climate. Cereals like wheat often sit in the hundreds to low thousands of litres per kg, rice is higher because of standing water, and many vegetables are lower per kg of fresh weight. The exact number depends on yield, climate and irrigation method, so compare like with like in your own conditions.
Why does the water footprint matter?+
It reframes water use around output rather than input. A field that uses a lot of water but yields heavily can have a lower footprint than a thrifty field that yields poorly. Tracking litres per kg shows where water productivity can improve and helps you compare crops, varieties and practices on a fair basis.
How can I lower a crop's water footprint?+
Anything that raises yield per drop helps: drip irrigation and mulching cut evaporation and losses, good agronomy and healthy soils lift yield, and matching the crop to the climate avoids wasted water. Because the footprint is water divided by yield, improving either the numerator or the denominator brings it down.
What is virtual water?+
Virtual water is the water embedded in a product — essentially its water footprint carried with the goods when they are traded. A tonne of grain effectively 'contains' the water it took to grow, so importing food imports virtual water. The litres-per-kg figure here is the building block of that idea.
Should I count rainfall or only irrigation?+
It depends on the question. The total water footprint includes rain (green water) and irrigation (blue water); a blue water footprint counts only the irrigation and other applied water. Enter whichever total matches what you want to study — for water-saving decisions, the applied irrigation water is usually the most actionable.
Can I compare crops with different prices or weights?+
Yes, but keep the basis consistent. Compare fresh weight to fresh weight, or convert to dry weight, and be clear whether you mean marketable yield or total biomass. The tool reports litres per kg and m³ per tonne for the yield you enter, so a fair comparison depends on entering comparable yields.
Is the result exact?+
The division is exact for the numbers you enter, so the footprint is precise. The real-world accuracy depends on how well you measure total water used and harvested yield. For meaningful comparisons, measure both consistently across seasons and treatments rather than mixing estimates with metered figures.