Everyday units
Milliseconds to weeks, without the mental math.
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Up to 12 significant digits. Decimal results may be approximate.
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Convert decimal hours to minutes, with examples explaining why 1.5 hours means 90 minutes rather than 150.
Convert minutes to decimal hours with a clear formula and guidance for interpreting the fractional-hour result.
From everyday arithmetic to powers, roots and trigonometry.
Find a percentage of any number in one simple step.
See the price after a percentage discount.