Sprite Sheet Calculator

A sprite sheet packs every animation frame into one image so a game engine loads a single texture instead of hundreds of small files, and this calculator lays those frames out in a grid and reports the resulting sheet size. It fits as many Frame Width-wide frames as possible into one row without exceeding Max Texture Size -- the GPU's hard limit on a single texture's dimensions -- then wraps remaining frames onto additional rows once Total Frames exceeds that row capacity. Because the number of frames per row is a whole number, Sheet Width steps rather than rises smoothly -- widening a frame by a few pixels can drop a whole frame off each row and make the finished sheet narrower, so it is worth nudging Frame Width up and down to find the size that packs cleanly. Sheet Width and Sheet Height are the tight-packed dimensions of that grid; POT Width and POT Height round those up to the next power of two (256, 512, 1024, 2048...) because many GPUs and older mobile hardware only accept power-of-two texture dimensions, or handle them far more efficiently, at the cost of unused padding. VRAM (RGBA) estimates the memory the padded, power-of-two texture will consume on the GPU at 4 bytes per pixel (one byte each for red, green, blue, and alpha), which is the number that actually matters for a mobile or web budget, not the tight-packed sheet size.

Frame Height only affects the sheet's height, never its width, since rows stack vertically and each frame's width is what determines how many fit across a row -- so changing Frame Height alone never changes how many frames fit per row or the sheet's horizontal extent. Fits In Texture reads 1 when everything fits and 0 when it does not, and it checks the padded power-of-two dimensions as well as the tight-packed ones -- since the POT texture is what the GPU actually allocates, a sheet whose tight size squeaks under the limit but whose POT size does not is still a sheet that will fail to upload. It also catches the case where a single frame on its own is wider or taller than the platform limit. Two things the layout deliberately does not model: it packs frames edge to edge with no padding, so if your renderer filters textures you will want 1 to 2 pixels of gutter or edge extrusion around each frame and should size up accordingly; and VRAM (RGBA) prices the base mip level only, so a mipmapped texture costs roughly a third more again.