Calculators
Each calculator runs the arithmetic from one of our guides on your own measurements, so you can go from the rule to the number you need before you order anything.
They work in inches and feet, show the rule behind every result, and run entirely in your browser: nothing you type is sent or saved. The guide linked from each one explains the exceptions and lists the sources.
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Rug Size Calculator
The rug size for a seating group, a dining table, a bed or a hallway, with the floor left showing at every wall.
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Curtain Rod and Panel Size Calculator
Rod height, bracket-to-bracket span, panel width for the fullness you want, and the stock length to order.
Based on Curtain Height, Width, and Length: The Numbers Before You Order
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Wallpaper Roll Calculator
Rolls to order, counted wall by wall in whole drops, with the pattern repeat and match included.
Based on How Much Wallpaper to Buy: Roll Size, Pattern Repeat, and Waste
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TV Mounting Height Calculator
Where the screen and the wall plate go, and the viewing angle you will live with.
Based on Mounting a Television at the Height You Watch It From
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Ceiling Fan Size and Downrod Calculator
Blade span for the room, the wall clearance check, and the downrod that puts the blades at the right height.
Based on Ceiling Fan Size and Downrod Length by Ceiling Height
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Bathroom Exhaust Fan CFM Calculator
The airflow rating to buy, by floor area for small rooms or by fixtures for large ones.
Based on Sizing a Bathroom Exhaust Fan in Cubic Feet per Minute