- Number of flagstones to units of area and vice versa
These calculators convert entered number of flagstones to area size and vice versa - calculate number of flagstones needed to cover entered ara size. Metric and imperial units are supported

- Number of working days between two dates
Calculator calculates the number of days between the two entered dates. Taking into account weekends, holidays and weekend shifts to work days, according to the published decrees of the government of the Russian Federation.

- Numerical integration
To calculate definite integral by the rectangle method, trapezoid method, Simpson method or other Newton-Cotes quadrature methods.

- Ohm's law
- Old Russian (Byzantine) system of chronology
Old Russian calendar - years since world creation

- One-variable function graph
This online calculator plots one-variable function graph given function formula and range of variable

Petroleum product density conversion, according to GOST 3900-85

- Parallel and perpendicular lines on a plane
This online calculator checks lines' slopes to see if they are parallel or perpendicular

- PBX channel number calculation
Calculates number of PBX telecommunications channels for given traffic load using Erlang B and Engset algorithms

- Pipe cold bending. Flexure depth with main shaft.
Calculates the section flexure depth with pipe bender or bending machine to obtain given parameters.

- 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

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

- Power to the People
Power units converter.

- 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

- 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.

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

- 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.

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