Latest posts
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Anniversary Calculator
Enter a wedding or start date to see how many years you’ve marked, when the next anniversary falls, and the traditional gift for it.
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PPI Calculator
Enter a screen’s diagonal size and resolution to get its pixels per inch, physical dimensions, megapixels and dot pitch.
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Battery Life Calculator
Estimate how long a battery will run a device: capacity in mAh divided by draw in mA, with a real-world efficiency factor built in.
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Pool Volume Calculator
Work out how many gallons and litres your pool holds — rectangular or round, using the average of the shallow and deep ends.
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LCM Calculator
Find the least common multiple of two numbers — computed through the GCF identity, with the shared multiples listed.
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GCF Calculator
Find the greatest common factor of two numbers — with Euclid’s algorithm shown step by step, and the LCM as a bonus.
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Distance Formula Calculator
Enter two coordinate points to get the distance between them — with the Δx/Δy breakdown, the midpoint, and the exact radical form.
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Pythagorean Theorem Calculator
Solve a² + b² = c² either direction — find the hypotenuse from two legs, or a missing leg from the hypotenuse — with exact form, perimeter and area.
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PX to REM Converter
Convert pixels to rem and back at any root font size — with the common pairs listed and the accessibility reason rem exists.
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Battery Charge Time Calculator
Enter a battery’s mAh, the charger’s output and the starting charge to estimate the charge time — ideal and realistic, with losses included.