Moisture Removal and Target Weight Calculator

Enter the current weight, current moisture, and target moisture to see how much water to remove and what weight to aim for after drying.

Because it uses wet-basis mass balance, it is practical even without weather integration for firewood, charcoal feedstock, and biomass drying plans.

If the target moisture is higher than the current moisture, the tool switches to a water-addition result instead of drying.

Wet-basis input kg, t, lb, US ton, long ton Shareable URL No weather model needed

Mass balance first

Start with dry matter, then derive the target weight and water change from the moisture numbers.

Global units

Work in kg, t, lb, US ton, or long ton without changing the calculation itself.

Easy to share

Put the state in the URL so the same drying condition can be reopened on another device.

Browser only

The calculation stays inside this browser, so no server upload is needed.

How to use

Enter the current weight and choose the unit used for that value.
Enter the current moisture and target moisture as wet-basis percentages.
Check the result cards for the water change, dry matter, and target weight.
Copy the share URL if you want to reproduce the same condition elsewhere.

Examples

These sample cases cover both firewood and charcoal feedstock.

Firewood batch

Input

Current weight 1,200 kg / current moisture 50% / target moisture 20%

Output

Dry matter 600 kg. Remove 450 kg of water. Target weight 750 kg.

Charcoal feedstock batch

Input

Current weight 10,000 lb / current moisture 50% / target moisture 20%

Output

Dry matter 5,000 lb. Remove 3,750 lb of water. Target weight 6,250 lb.

Glossary

Wet basis: Moisture expressed as a share of the total current weight.
Dry matter: The solid part that remains after water is removed.
Current water: The water contained in the material right now.
Target weight: The total weight you want to reach after drying.
Mass balance: A way of thinking about the in-and-out balance of mass.

Formulas

The calculator uses only mass balance. No weather model, drying curve, or time estimate is involved.

Dry matter = current weight × (1 - current moisture)
Target weight = dry matter ÷ (1 - target moisture)
Water to remove = current weight - target weight
Current water = current weight - dry matter
Target water = target weight - dry matter

FAQ

What does wet-basis moisture mean?

It is the water share of the total weight. If the moisture is 50%, half of the current weight is water.

Why cannot the target moisture be 100%?

At 100%, the relationship with dry matter becomes undefined, so the target weight cannot be determined.

Can I use lb or tons?

Yes. The calculator supports kg, t, lb, US ton, and long ton.

What if the target moisture is higher than the current moisture?

That means water must be added rather than removed, so the tool shows an add-water result.

Does this estimate drying time too?

No. It only handles mass balance and does not estimate drying time.

Notes

This tool does not estimate drying time, weather effects, shrinkage, cracking, or combustion efficiency.
Target moisture must be below 100%. A target of 100% is not calculable.
If the target moisture is higher than the current moisture, the result switches to water addition.
If the current moisture is 100%, the dry matter becomes zero. Check the measurement carefully.