- Battery discharge time depending on load
This article contains online calculators which can calculate discharge times for specified discharge current using battery capacity, the capacity rating (i.e. 20 hour rating, 100 hour rating etc) and Peukert's exponent.

- Beaufort scale
Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.

- Binary Coded Decimal (BCD)
This online calculator converts decimal number to binary code in BCD notation and vice versa

- Binary numbers calculator
This calculator supports common mathematical operations over binary numbers

- Binary, inverse and complement codes
Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

- Bisection method
The bisection method in mathematics is a root-finding method that repeatedly bisects an interval and then selects a subinterval in which a root must lie for further processing. The method is also called the interval halving method.

- Body fat calculator - YMCA formula
- Caesar cipher
Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

- Calculation of payments on corporate property tax
Calculation of the tax amount and the amount of advance tax payments in accordance with Chapter 30 of the Russian Federation Tax Code

- Calculation of the volume by weight
Calculation of the volume and parameters of regular geometric figure by given mass using density of matter reference book.

Calculating the weight by the volume of material with matter density reference book

- Calculation of weight by volume
Calculating the weight by the volume of material with matter density reference book

- Calculator of area of a triangle using Hero's formula
- Capacitor in Direct Current Circuit
These online calculators computes various parameters for charging and discharging the capacitor with the resistor

- Cartesian and polar two-dimensional coordinate systems
This online calculator converts polar coordinates to cartesian coordinates and vice versa.

- Celsius to Fahrenheit calculator explained
- Circle formulae
Circle formulae

- Circular sector
Calculates area, arc length, perimeter and center of mass of circular sector

- Circular segment
Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.

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