Energy Unit Pairs
234 conversion pages for energy units, each with its exact factor, the formula and a reference table.
The Energy Unit Pairs collection covers 234 pages of energy units — one page for each ordered pair of units, so there is nothing to configure before you get an answer.
Conversions are split one per direction rather than collapsed into a single dual-dropdown tool. It means “British Thermal Units to Ergs” lands on a page about exactly that, with the right examples and the right reference table, instead of a generic converter you have to set up before it tells you anything.
Every page states the exact factor it uses, writes the formula out in full, and shows the arithmetic applied to real numbers rather than only handing you an answer. Where a factor is defined rather than measured — an inch is exactly 25.4 mm, a pound exactly 0.45359237 kg — the page says so, so you can see the result is exact and not a rounded approximation of an approximation.
This collection reaches across the full energy grid, including electronvolts, therms, tonnes of TNT and tonnes of oil equivalent. Sitting in Energy & Power Units, it links back to the sibling collections that share its units, so a chain of conversions never needs a second tab.