Today with the addition of Energy conversions to the online conversion calculators the site now has more than 3000 different conversion calculators. The project has been a fun learning experience in PHP/MySQL and I plan to continue adding more features and conversions.
How Accurate are the Conversions?
Most of the conversion factors and formulas are sourced from wikipedia. The most popular formulas have been check with other sources and appear to be fine. However, most conversions will involve floating point numbers and computers aren’t known to be very good with really small decimals. Especially when converting between units that have very large size differences be careful, and keep in mind rounding errors are possible.
Hopefully things will continue to improve. Do contact me with any errors you notice.