- Glue solution strength
This online calculator can be used to find out required amount of dry glue and water to get the needed solution strength

- Golden ratio
This calculator determines proportions according to golden ratio

- Gregorian calendar. Julian calendar. The calendar eras.
The calculator convers julian calendar date to gregorian calendar date taking in account the calendar era.

- 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.

- Humidification loads
This online calculator answers question "how to choose" humidifier, by calculating humidification requirements given initial and target relative humidity and building parameters

- Hydrostatic pressure
This online calculator can solve hydrostatic pressure problems by finding unknown value in hydrostatic equation.

This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

"One of the following characters is used to separate data fields: tab, semicolon (;) or comma(,)"

- Hyperbolic functions
Calculation of hyperbolic functions

- Ideal weight calculator using Body Mass Index
- Ideal weight calculator using Paul Broca formula
Ideal weight calculator using Paul Broca formula

- Imperial to Metric and Metric to Imperial measures of length converter
- Incircle of a triangle
This online calculator determines the radius and area of the incircle of a triangle given the three sides

- Indicators of variations
Calculation of variation - the coefficient of variation, dispersion, mean square deviation, etc.

- Ingredients. Proportional quantities
This online calculator recalculates quantities of ingredients for given proportions if quantity of one ingredient has changed

- Integer factorization. Trial division
Integer factorization using trial division algorithm.

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