A transparent converter for units, energy, fuels and emissions.
Convert values, understand the assumptions, and trace every non-exact result back to its source. Exact conversions and estimates are always kept apart.
A value always needs a unit. Add a target to convert directly — e.g. 1 kWh to MJ.
Type a value and a unit.
For example 1 kWh · 10 L diesel · 5 kW for 3 h · 1 kWh to MJ
Exact vs. source-based — always distinct
Every result is tagged: an SI identity, a standard definition, a sourced value, or an estimate. We never dress an estimate up as exact.
How it works →Fuels & emissions, with the caveats
Density, heating values (LHV/HHV labeled), energy per litre/kg/m³, and CO₂ vs CO₂e kept separate — with the assumptions and warnings on display.
Browse fuels →Learn the concepts
kW vs kWh, HHV vs LHV, barrel vs boe, why m³ of gas is not exact, why grid emissions depend on region and year — short, sourced explanations.
Start learning →Why another converter?
No invented numbers. Every non-exact factor cites a source. Missing data is marked not available — never guessed.
The pitfalls, surfaced. CO₂ ≠ CO₂e, LHV ≠ HHV, boe ≠ a physical barrel, kW ≠ kWh — the tool refuses to blur them.
Context over false precision. When a question needs a region, a year, or a duration, we ask — instead of returning a confident wrong answer.