This page offers conversions from biblical weights and measurements into modern measurements. Some Bible translations already do this, some offer a conversion as a footnote, and some use the old unconverted words. Using this page you can find out approximately what the Biblical author intended when they wrote a measurement.
All measurements are modern day approximations and should not be taken as exact conversions. For instance, a quart and a liter are nearly the same amount but they are not exact. The greater amount, the more the conversion suffers. A meter and a yard are similar but 100 meters is over 108 yards.