All online calculators
- Gregorian calendar. Julian calendar. The calendar eras.
The calculator convers julian calendar date to gregorian calendar date taking in account the calendar era.
- H264 Maximum References Frames
H264 Maximum References Frames
Hack the three-digit code
- Hartley's formula
Hartley's formula to determine the amount of information contained in a message with length n.
- Heat Index
This calculator calculates heat index (apparent temperature), which is used by US meteorologists to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade.
- Height in old Russian system of measures
This calculator computes height expressed in old Russian measure system units: arshins and vershoks
- Hill cipher
This calculator uses Hill cipher to encrypt/decrypt a block of text
- Hip roof calculator
This calculator will help you estimate hip roof parameters, including rafters and roof area
Histogram generation according to input data. The number of groups is determined by the Sturgess formula, other formulas or set manually
- Histogram group number
Sturges formula and other methods of determining the number of groups in histogram generation
- How many circles of radius r fit in bigger circle of radius R
This calculator estimates how many circles of radius r can be placed inside another circle of radius R.
- How many days are there between two dates?
This is simple day calculator which determines number of days between two dates.
- How many hours between two days
This online calculator helps you to calculate how many hours (and minutes) between two week days, i.e., Friday at 7 a.m. until Sunday at 9 p.m.
- How many months are there between two dates?
This online calculator calculates how many months are there between two dates.
- How many weeks are between two dates
This calculator determines number of weeks between two given dates
- How many workdays between two dates?
The calculator evaluates number of working days and holidays for a period of time. The calculator based on the U.S. federal holidays table recognised in most states.
- HTML table to JSON array
Th calculator converts the html table code to JSON array with optional data transpose and compression. It also visualizes numeric data on chart.
- Huffman coding
This online calculator generates Huffman coding based on a set of symbols and their probabilities
- Humidification loads
This online calculator answers question "how to choose" humidifier, by calculating humidification requirements given initial and target relative humidity and building parameters
This calculator calculates Humindex, index used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity.