Calculators
Calculate payments, grades, measurements and everyday math.
Calculators
Showing 221–240 of 320 tools
Range Calculator
Find the range as largest observation minus smallest observation.
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Ratio Calculator
For a / b = c / x, the missing value is x = b × c / a.
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RC Time Constant Calculator
Find the time constant of an ideal first-order RC circuit as RC.
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Rectangle Area Calculator
Area = width × height.
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Rectangle Diagonal Calculator
Find a rectangle diagonal using √(width² + height²).
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Rectangular Prism Volume Calculator
Rectangular prism volume = length × width × height.
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Regular Polygon Area Calculator
Regular polygon area = n × side² / (4 × tan(π/n)).
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Regular Polygon Perimeter Calculator
Find a regular polygon perimeter as side count × side length.
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Regular Prism Volume Calculator
Find a prism volume from a regular polygon base and perpendicular height.
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Rent vs Buy Calculator
Compare estimated renting and buying cash costs using home price, financing, ownership expenses, and rent growth.
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Reynolds Number Calculator
Reynolds number = density × speed × characteristic length / dynamic viscosity.
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Rhombus Area Calculator
Find rhombus area as half the product of its diagonals.
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RL Time Constant Calculator
Find the time constant of an ideal first-order RL circuit as L/R.
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RMS Calculator
Calculate the root mean square of supplied values.
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ROI Calculator
Calculate simple return on investment from the initial cost, final value, additional income, and costs.
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Roman Numeral Converter
Convert between integers and canonical Roman numerals.
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Rotational Kinetic Energy Calculator
Rotational kinetic energy = Iω²/2.
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Rounding Calculator
Round a number to a chosen number of decimal places.
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Running Pace Calculator
Calculate running pace per kilometre and per mile from a distance and elapsed time.
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Sagitta Calculator
Find the minor-arc sagitta as r(1 − cos(θ/2)).
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