We use some essential cookies to make this website work.
We’d like to set additional cookies to understand how you use forestresearch.gov.uk, remember your settings and improve our services.
Preparing to search
Most woodfuel boilers are designed to operate with fuel of moisture content of a limited range. If you try to use fuel that is outside this range the boiler will either operate inefficiently, leading to increased emissions, or trip out the control system and fail to function at all. It is very important to find out from your boiler or stove manufacturer or installer what is the correct moisture content range you should be obtaining.
Also, if you buy wooodfuel by weight, then moisture content is critical to knowing how much you are paying for your energy. This is far less significant if you buy by volume as the water content does not add appreciably to the volume. You still need to be sure that it is compatible with your boiler, however!
This is an Excel spreadsheet tool giving the net calorific value (LHV) of wood (in GJ/t in sheet 1, MWh/t in sheet 2)as a function of moisture content, together with some representative values of density for solid wood, and bulk density forvarious forms of woodfuel, for typical hardwoods and softwoods.
Please note that values of wood density vary considerably between species, and even between different samples of the same species depending on growth conditions, etc. You can substitute values for specific species from the spreadsheet below, or average values from combinations of woods, into cells E4 (hardwood) and F4 (softwood) of sheet 1 (net CV in GJ) and the appropriate values will be substitued elsewhere in the spreasheet as required.
Also includes conversion of moisture content quoted on dry basis to wet basis.
Cookies are files saved on your phone, tablet or computer when you visit a website.
Find out more about cookies on forestresearch.gov.uk
We use 3 types of cookie. You can choose which cookies you're happy for us to use.
These essential cookies do things like remember your progress through a form. They always need to be on.
We use Google Analytics to measure how you use the website so we can improve it based on user needs. Google Analytics sets cookies that store anonymised information about: how you got to the site the pages you visit on forestresearch.gov.uk and how long you spend on each page what you click on while you're visiting the site
Some forestresearch.gov.uk pages may contain content from other sites, like YouTube or Flickr, which may set their own cookies. These sites are sometimes called ‘third party’ services. This tells us how many people are seeing the content and whether it’s useful.