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i have been making some rpg maps and ive been using 21,*15 maps with 10*10 sprites i was wondering if i wanted to use the whole screen what size should my map be and what size should my sprite be, im not so good at math

I you want to fill the whole screen I usually use 20x20 sprites to get a 16x10 playfield on the screen.
16x16 sprites are possible too.
10x10 sprites are too small usually, try not to use it often unless you make a non-gridsnapped game in which sprite size doesn't matter and there's no grid.

but in screen 13 it goes off the screen, the map i mean, the very bottom row

1.- Use tiles sized with a power of two. That will make calculations faster as divisions and multiplications are changed by bit shifts by the compiler. That means that 8x8, 16x16 or 32x32 are good sizes.

2.- My fave is 16x16 'cause it's not too small, nor too big. Using that size you can almost fill your screen with 20x12 tiles which will produce a 320x192 pixels image in your 320x200 pixels screen.

so the map in data statments will be 16x16

No.

Read. 20x12.

16X16 was used on the NES

The NES and the SNES used 8x8 tiles.

CPS2 / NeoGeo, for example, used 16x16 tiles.

when i view nes screen shots in paint they come up as 16X16

Quote:when i view nes screen shots in paint they come up as 16X16

The nes supports 8*8, 16*16, 32*24 and It has a +-32 screen buffer at the edges for scrolling.