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CalcClearly: Free Online Calculators

Free calculators, explained clearly

Pool doses, garden materials and DIY quantities, worked out properly. Every calculator shows the formula, a worked example and the answers to the questions people actually ask.

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Find the specific tool for your next big decision.

Popular Featured Tools

Three tools people reach for most around the house and pool.

Pool & Water pH

Pool Chemical Calculator

Get exact doses for chlorine, shock, pH, and alkalinity.

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Yard & Garden yd³

Gravel Calculator

Calculate how much gravel you need in cubic yards and tons for pea gravel, crushed stone, river rock, and more — with a compaction buffer, editable density, and cost.

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Home Projects +10%

Tile Calculator

Find out how many tiles and boxes you need for any room.

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Why use CalcClearly?

  • Proven Formulas

    We don't just give results — we show the math behind them so you can learn.

  • Instant Results

    Real-time calculations as you type. No waiting, no refreshing pages.

  • Privacy First

    Calculate privately in your browser. Inputs are sent to us only if you request an emailed PDF.

30 ft

Length

15 ft

Width

4.5 ft

Avg. depth

Pool volume: 15,148 gallons