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Calculate your exact age in years, months, weeks, and days from a date of birth and a reference date.

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Volume of concrete needed for a slab, footing, or column — with a suggested overage buffer to avoid running short.

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Estimate your annual personal CO₂e footprint from home energy, driving, flying, and diet — with adjustable emission fact...

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Convert a daily calorie target into grams of protein, carbohydrates, and fat using a chosen macronutrient split.

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Solve a triangle from any valid combination of sides and angles — SSS, SAS, ASA, AAS, or SSA.

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