Most home decor questions come down to a number: how big the rug, how long the curtains, how many lights on the tree. These free calculators do the math for you. Each one sits inside a guide that explains where the numbers come from, so you can check them against your own room.
Rugs, Curtains and Walls
Enter your sofa and room size, and it checks every standard US rug size against the layout you want.
Rod length, number of panels and the curtain length to buy, in one go.
The same three numbers, with the step-by-step on hanging the rod.
Where the hem actually lands for the length on the package.
Sheer and blackout layer widths
How wide each layer needs to be when you hang two.
Peel and stick wallpaper rolls
How many rolls a wall needs once the pattern repeat is counted.
Shade size from your lamp base height and width.
Christmas and Holiday Table
How many lights your tree needs, from its height and shape.
How many ornaments, by tree size and ornament size.
The skirt diameter from the branch spread, not the tree height.
Whether a collar’s listed opening fits around the base of your tree.
Which bag holds your tree, from the size of the box it came in.
The exact tablecloth size, the closest standard sizes and the drop each one gives you.
Room per guest, plus the centerpiece, garland and candle sizes that fit your table.
Garland length for your mantel, with a check on clearance from the fire.
Warmth and Air
Heated throw and electric blanket cost
What a heated throw or blanket costs to run at your electricity price.
The CADR your room needs, worked out from its size.
How many plants your room would need to clean the air, and why that number is unrealistic.
Prefer Paper?
Two of the size guides also come as free printables you can take to the store:
More checklists and planners are in the free printables library.