About UK CBAM Calculator
Joe, who reads HMRC's and HM Treasury's own CBAM publications and builds them into a calculator, each figure dated.
Why this site exists
HMRC publishes the rates, the worked example and the default values on separate pages. A calculator built on those exact figures lets an importer see its exposure in a minute.
Who it is for
UK importers of steel, aluminium, cement, fertiliser and hydrogen working out what the carbon border adjustment mechanism will cost them from 2027.
What is on this site
One question, "uk cbam calculator", answered with a calculator that works on the page with no account, 3 guides on the questions around it, a data table you can cite (the figures and their method), and the sources every figure rests on.
- UK CBAM rates for 2027: HMRC's illustrative figures by sector: HMRC's illustrative 2027 UK CBAM rates per tonne of CO2e for iron and steel, aluminium, cement, fertiliser and hydrogen, and how each rate is worked out.
- UK CBAM default values: HMRC's emissions per tonne by CN code: HMRC's UK CBAM default values in tonnes of CO2e per tonne of product, for the first CN codes on each sector's list, and how to use them in the calculator.
- UK CBAM registration: the £50,000 threshold and the two tests: When a UK importer must register for CBAM: the £50,000 threshold, the backward and forward tests, 30 days to register, and the records HMRC expects kept.
What it does not do
- We do not give tax, legal, customs or investment advice.
- We do not pass your enquiry to any firm.
- We do not use a figure we have not read from HMRC, HM Treasury or DESNZ.
Who answers for it
Joseph Ellul-Turner, Director.
Reach us
Contact for a question about the site, or enquiries@ukcbamcalculator.co.uk. The legal terms are on Terms and Privacy.
This calculator applies HMRC's published illustrative 2027 CBAM figures to what you enter; it is not tax, customs or legal advice, and HMRC's return is the figure you pay. An enquiry sent through the form is read and answered by Joe, who runs this site; no firm receives it.