# All online calculators

- Modular Multiplicative Inverse
This calculator calculates modular multiplicative inverse of an given integer a modulo m

- Molar mass of the substance
Calculates the molar mass of the substance using atomic mass units from the periodic table

- Monthly issue number generator
Issue Number Generator for unnumbered magazines & comics & newspapers. If magazine did not print issue numbers, only months, it can number them all, f.e. all months starting with specified date up to specified date

- Moonphases
Moon's age and phase calculation

- Mortgage calculator
- Multiplication in columns
Calculator shows results of multiplying in columns, can be used to check answers

- Nautical measurement units
Nautical mile, sea mile, cable

- Normal distribution
Plots the CDF and PDF graphs for normal distribution with given mean and variance.

- Normal force
This online calculator calculates strength of the normal force from the mass of the object, the gravitational field strength and the angle of the inclined surface measured from the horizontal.

- Number of agents in call center
The calculator works out number of call center agents using Erlang C formula for given call load and service level.

- Number of days in a year

- Number of flagstones for paving
This calculator will help you to estimates number of flagstones needed for paving

- 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 (for Russia)
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
This calculator determines current by voltage and resistance using ohm 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