Calculators Tools

Curated Collection

Calculators

Daily and professional calculation tools.

Percentage Calculator

Calculate percentages, percentage change, discount, markup, and percent-of values in one place.

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Date Calculator

Calculate date differences, add or subtract days, and count business days between dates.

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Age Calculator

Calculate exact age in years, months, and days, plus total months and next birthday countdown.

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BMI Calculator

Calculate BMI with live-linked cm, feet, inches, kg, and lb inputs while viewing healthy weight ranges in both systems.

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Room Surface Area Calculator

Calculate paintable wall area for any room — deduct doors, windows, and AC openings; exclude skirting; add lofts or projections. Download a detailed PDF report. Useful for painting, putty, and civil work estimates.

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