Free home & DIY calculators
Ten instant home improvement calculators that run entirely in your browser. No signup, no upload, no ads.
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Paint Calculator
Calculate how many gallons of paint you need for walls and ceilings by room dimensions.
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Wallpaper Calculator
Find out how many rolls of wallpaper you need based on room dimensions and pattern repeat.
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Tile Calculator
Calculate tile quantity for floors or walls with adjustable waste factor.
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Lawn Fertilizer Calculator
Calculate how many bags of fertilizer you need based on lawn area and product coverage.
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Room Area Calculator
Calculate floor, wall, and ceiling area for rectangular or L-shaped rooms.
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Ceiling Fan Size Guide
Find the right ceiling fan blade span for your room size and ceiling height.
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AC BTU Calculator
Calculate the BTU capacity needed to cool a room based on size and sun exposure.
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Electricity Cost Estimator
Estimate monthly electricity cost for any appliance by wattage, daily hours, and rate.
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Water Bill Estimator
Estimate your monthly water bill from showers, laundry, dishwasher, and outdoor use.
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Plant Watering Schedule
Build a weekly watering calendar for all your houseplants based on watering frequency.
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Why use browser-based home calculators?
Every calculator on this page runs entirely inside your browser — no data is ever sent to a server. That means your home dimensions, utility rates, and project details stay completely private. The calculations are instant, work offline once loaded, and are accessible on any device.