DURING PREFLT THE FO NOTICED THAT THE ACFT'S GROSS RAMP WT WAS EXCEEDED; TO WHICH THE CAPT REPLIED THAT IT WAS OK SINCE FUEL COULD BE BURNED OFF PRIOR TO LNDG. HOWEVER; THE CREW DISCOVERED AFTER TKOF THAT THE GROSS TKOF WT HAD ALSO BEEN EXCEEDED.

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ON DEC/XA/99; AN ERROR WAS MADE WHILE FIGURING OUR WT AND BAL; CAUSING US TO DEPART ABOUT 800 LBS OVER MAX TKOF WT. THIS WAS OUR FIRST LEG OF A 3-DAY TRIP. I WAS COMING DOWN WITH A COLD AND FEELING TIRED. THE CAPT; FLT ATTENDANT AND I WERE WAITING FOR OUR ACFT TO ARRIVE; WHICH WAS RUNNING LATE. ONCE OUR ACFT ARRIVED I COMPLETED THE PREFLT FOR OUR FLT FROM DENVER; CO; TO BISMARCK; ND. WE WERE RUNNING ABOUT 30 MINS BEHIND SCHEDULE. OUR PAPERWORK FOR PAX IS GIVEN TO US JUST PRIOR TO BEFORE START. THIS IS A VERY BUSY TIME FOR THE FO. I COMPLETED THE WT AND BAL FORM AND NOTICED THAT THE PROPOSED LNDG WT WAS A FEW HUNDRED LBS OVER THE MAX LNDG WT. I HANDED THE CAPT THE FORM AND SHOWED HIM THE PROB. HE ASSURED ME THAT WITH THE STRONG HEADWINDS WE WOULD BURN MORE FUEL THAN OUR PLANNED FUEL BURN AND THAT WOULD NOT BE A PROB. THE CAPT CHKED AND SIGNED THE FORM AND GAVE A COPY TO THE RAMP PERSONNEL. BOTH THE CAPT AND I FAILED TO NOTICE THAT WE HAD EXCEEDED OUR MAX RAMP WT OF 31019 LBS AND OUR MAX TKOF WT OF 30843 LBS BY ABOUT 800 LBS. WE THEN DEPARTED DENVER FOR BISMARCK. ABOUT 15 MINS INTO THE FLT; THE CAPT OBSERVED ON THE FMS THAT THE WT WAS OVER OUR MAX TKOF WT. WE DECIDED TO CONTINUE TO BISMARCK AND IF NECESSARY WE COULD CIRCLE AT THE DEST AND BURN ANY ADDITIONAL FUEL TO BE AT MAX LNDG WT. WE ARRIVED AT BISMARCK AND WERE BELOW OUR MAX LNDG WT AND LANDED WITHOUT ANY FURTHER INCIDENT. THE FLT WAS SMOOTH THE ENTIRE FLT AND NO EXTREME CONDITIONS WERE INCURRED. WE THEN NOTIFIED OUR CHIEF PLT OF THE MISTAKE. FACTORS THAT I BELIEVE TO HAVE CONTRIBUTED TO THE ERROR: 1) I WAS TIRED AND COMING DOWN WITH A COLD. 2) BEING RUSHED AT THIS PORTION OF THE PREFLT. 3) NOT LOOKING MORE CAREFULLY AT THE WHOLE FORM AND FOCUSING ON JUST ONE PROB. HAVING A LOAD PLANNER WOULD HELP WITH INSURING THAT THESE KINDS OF MISTAKES DO NOT OCCUR.