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Enter the temperature and wind speed to get the wind chill — how cold it actually feels.

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Convert weight between kilograms, pounds, ounces, stone, grams and tonnes.

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Find how much water a pool, pond, tank or aquarium holds — in gallons, liters and cubic feet, with fill time from a flow rate.

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Estimate how many rolls of wallpaper you need from your wall size and roll dimensions.

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Calculate the volume of a box, sphere, cylinder or cone from its dimensions.

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Estimate the voltage drop over a run of copper wire from its gauge, length and current.

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Add VAT to a net price or remove VAT from a gross price at any rate — showing the net, VAT and gross amounts.

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Estimate the monthly payment on a VA-style home loan.

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Convert text to URL-safe percent-encoding and decode it back, entirely in your browser.

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Enter the three sides of a triangle to get its area, perimeter and type.

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