For soybeans, you don't even need a converter, sites like the one below display the price both by the bushel or the tonne (metric ton).
But if you need one, you can just multiply the dollar price per bushel by 36.743 to get the price per tonne.
Soybean meal is not sold by the bushel, which is an unit of volume for crops only, i.e. soybeans, not processed products which are sold by weight. A bushel of soybeans is standardized at 60 pounds, but there is no such standardization for soybean meal.
Assuming the test weight of the soybeans is USDA's 60 pounds per bushel, you would just divide the current price per bushel (example: $9.45 US) by 60 to get 15.75 cents (US) per pound. If the soybeans do not test at 60, then just use the adjusted test weight for that batch.
The related link below should more than answer your question. Aaron
A bushel of soybean (60 pounds) currently (August 2012) sells for around $16-17. Non GMO food grade soybean (yellow hilum) sold for a $2.15 premium but yield is usually lower. It is a very volatile market that changes from day to day, and we don't have the data on the 2012 crop yet, the U.S. drought seems to have ended so there will probably be no shortage and no spiked prices. Prices in January 2012 were around $12 per bushel.
What is the price of a bushel of rice today
$3.00/ bushel 1 bushel weighs 32lb.
There's the last bushel of corn! I wonder what the price of a bushel of beets would be today.
Soybeans are a global "commodity" market item. You can find the daily price per bushel or tonne on the site linked below. On August 26, 2012, soybeans are priced at $18.22 per bushel (60 pounds), or $669.28 per tonne, an increase of $228 per tonne since the beginning of the year. For retail prices, for instance if you make your own soy milk, check with local retailers.
14$
22.00
318.10
As of September 6, 2009 corn is $3.06/bushel!
US average price received by farmers, all wheat types was $7.44 per bushel in 2011.
The price received by farmers for all wheat in 2011 averaged $7.44/bushel. A record high price ($8.02/bushel) occurred in 2008. Prices declined to $5.30/bushel in 2009 and $5.12/bushel in 2010. Durum wheat prices average $5.80/bushel in 2011. Hard red winter wheat prices ($7.04/bushel) and hard red spring prices ($8.38/bushel) were also near record levels. Prices for soft red winter wheat ($6.79/bushel), all white wheat ($6.59/bushel), and durum wheat ($9.20/bushel) were also very strong.