Calculators
Calculate payments, grades, measurements and everyday math.
Calculators
Showing 181–200 of 320 tools
Parallel Resistance Calculator
Find equivalent ideal parallel resistance as 1 / Σ(1/R).
Open tool
Parallelogram Area Calculator
Find parallelogram area as base × perpendicular height.
Open tool
Parallelogram Perimeter Calculator
Find a parallelogram perimeter as twice the sum of adjacent sides.
Open tool
Pendulum Period Calculator
Small-angle pendulum period = 2π × √(length / gravity).
Open tool
Percent Change Calculator
Calculate percentage change and absolute difference between a positive starting value and a new value.
Open tool
Percent Difference Calculator
Calculate symmetric percent difference using the two-value average.
Open tool
Percent Error Calculator
Calculate absolute percent error relative to a reference.
Open tool
Percentage Calculator
Result = percentage × base amount / 100.
Open tool
Percentile Calculator
Find a percentile by linear interpolation in sorted data.
Open tool
Percentile Rank Calculator
Calculate a midrank percentile as 100 × (below + half the equal count) / n.
Open tool
Permutation Calculator
Count ordered selections without repetition.
Open tool
Pipe Volume Calculator
Find material volume of a hollow circular cylinder as π(R² − r²)L.
Open tool
Pixel To Inch Converter
Printed inches = pixel length / pixels per inch.
Open tool
Point Reflection Calculator
Reflect a Cartesian point across a selected axis or the origin.
Open tool
Point Rotation Calculator
Rotate a 2D point about the origin.
Open tool
Point To Line Distance Calculator
Find perpendicular distance from a point to Ax + By + C = 0.
Open tool
Poisson Probability Calculator
Calculate P(X = k) for a Poisson event count.
Open tool
Polar To Cartesian Converter
Convert a polar point into Cartesian x and y.
Open tool
Polygon Apothem Calculator
Find a regular polygon apothem as side / (2 tan(π/n)).
Open tool
Polygon Interior Angle Calculator
Find one interior angle of a regular polygon in degrees.
Open toolNo matching tools
Try a different search, clear it, or choose another category.