- Polygon area
Online calculator which calculates area of a polygon given lengths of polygon sides and diagonals which split polygon to nonoverlapping triangles

- Power into Torque and vise versa
This online calculator turns power into torque and vise versa

- Power to the People
Power units converter.

- Pressure over a surface
This online calculator computes pressure, cause by given mass over given surface in gravity field. Result is displayed using different units of pressure

- Pressure units converter
Calculator which converts units of pressure

- Price based on running meter
This online calculator calculates the price of certain area based on price of running or linear meter

Calculation of unknown parameters of projection using known parameters. Parameters are duration, maximum height, distance, initial velocity and angle.

- Probability of given number success events in several Bernoulli trials
Gives probability of k success outcomes in n Bernoulli trials with given success event probability.

- Progressive tax
Calculates progressive tax according to tax rate table.

- Proportion
This online calculator finds unknown member of proportion. Created by user's request

- Prospect distance from the ground and line of sight distance between two observers
Calculates the prospect distance from height at observer and line of sight distance between two observers.

- Racing laps table
This is generator of lap running order for kart racing. The goal is to let each racer to try each starting position/kart in random order.

This online calculator determines parameters of circumcircle and incircle of a regular polygon

- Random combination of numbers from specified range
This calculator randomly picks several numbers from specified range.

- Raoult's Second law and the freezing temperature.
Calculation of boiling point and crystallization (freezing) of non-electrolyte solutions.

- Rectangle area calculation by perimeter
Rectangle area calculation with known perimeter and aspect ratio

- Regular expression tester
This online calculator allows user to experiment with regular expressions.

- Regular polygon area from circumcircle
Calculates the area of the circumcircle and of the regular polygon from radius of circumcircle and number of sides

- Regular polygon, number of sides and length of side from incircle and circumcircle radii
This online calculator finds number of sides and length of side of regular polygon given the radii of incircle and circumcircle

- Relative humidity to absolute humidity and vise versa calculators
First calculator converts relative humidity to absolute humidity for given temperature and barometric pressure. Second calculator converts absolute humidity to relative humidity for given temperature and barometric pressure

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