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Percentage Calculator
Calculate a part as a percentage of a total, with a clear example and checks for 50%, 100%, and values above 100%.
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Everyday productivity, cost, and comparison tools.
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General Tools
Average Calculator
Calculate an arithmetic mean from a known total and count, with a worked example and a quick verification check.
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Square Root Calculator
Calculate the square root of a non-negative number.
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Ratio Calculator
Calculate the ratio of the first value to the second.
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Sample Size Calculator
Estimate sample size using Slovin's formula.
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Weighted Score Calculator
Calculate a score contribution using its weight.
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Productivity Rate Calculator
Productivity Rate Calculator — a general-purpose calculator for a clearly defined numerical metric with explicit inputs and units.
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Task Completion Rate
Calculate completed tasks as a percentage of total tasks.
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Fuel Efficiency Calculator
Fuel Efficiency Calculator — a general-purpose calculator for a clearly defined numerical metric with explicit inputs and units.
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Electricity Usage Cost
Electricity Usage Cost — a general-purpose calculator for a clearly defined numerical metric with explicit inputs and units.
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Water Consumption Cost
Calculate water consumption cost from volume and unit price.
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Unit Price Calculator
Calculate price per unit for product comparison.
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Shared Expense Split
Split a shared expense equally among people.
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