Using this calculator you can calculate the percentage concentration, also called the percentage by weight of chemical substances in mixtures and solutions.

This calculator helps us check whether the planned investment will be profitable and whether the project should be accepted or rejected.
Thanks to the calculator, we can calculate:
NPV (Net Present Value) - sum of discounted net cash flows
PI (Profitability Index) - investment profitability
IRR (Internal Rate of Return) - internal rate of return
DPP (Discounted Payback Period) - discounted payback period
Value of discounted net cash flow for each period.

You can calculate any system of linear equations, both homogeneous and heterogeneous with any number of unknowns by Gauss-Crout elimination method.

You can calculate with explanations any system of linear equations, both homogeneous and heterogeneous with any number of unknowns by Gaussian elimination method. As a result, apart from the solution, you will also receive a complete analysis and a step-by-step calculation.

With this statistical calculator, you will learn how to calculate a linear regression step by step.

Using this calculator you can calculate the molar concentration of the solution, ie the number of moles of a given chemical substance that contains 1 liter of solution.

The FV calculator helps us calculate the future value of the investment. The FV calculator calculates the amount we will receive in the future after validating a given amount now for a specified number of years and after calculating the interest due, assuming that they will be capitalized (added to the capital) with a given frequency (e.g. weekly, monthly, quarterly, semi-annually, annually) .

With the COTANGENT trigonometric function calculator you can calculate the values of any cotangent function. In addition to the response results, the calculator will also plot the selected function. You can choose one of the preset functions, e.g. cotangent, cot² - cotangent square, arccot - arcus cotangent, coth - hyperbolic cotangent, arcoth - inverse function to coth, you can also enter your own function, e.g. cot(x) * cot(x) * cot(x) for cot³(x), cot(2x), cot(x+3), cot(x^2) etc.

Using this calculator, you can calculate the total volume of the solution after dilution and the volume of solvent added during dilution.

Thanks to the calculator, you can use several factors to check the degree of risk of a heart attack in the next ten years.

How to convert cat's age into human's age? How old is a cat in human years? How long does a cat live? Cat Age Calculator can help you with these and other questions. By giving the cat's age, we will find out how old he would be if he were a human. We can also check what age a cat would be at our age.

ROT13 cipher online encoder and decoder. Encrypt and decrypt any cipher created in a ROT13 cipher. You can use any shift and additionally a key for more precise text encoding.

The calculator is used to calculate the coverage of bills by profit before paying off the tax bill.

Affine cipher online encoder and decoder. Encrypt and decrypt any cipher created in a Affine cipher.

With the GUDERMANN trigonometric function calculator you can calculate the values of the hyperbolic amplitude. In addition to the response results, the calculator will also plot the selected function. You can choose a ready-made function, e.g. gd(x) or arcgd(x) as the inverse of the Gudermann function, or enter your own function, e.g. gd(x^2), gd(x+3), etc.

Vernam cipher online encoder and decoder. Encrypt and decrypt any cipher created in a Vernam cipher.

With the Fractions Calculator, you can subtract any two mixed numbers or proper and improper fractions.
Fractions Calculator will show you the result of operations on fractions step by step and will give you explanations of the operations performed to subtracting fractions. You will learn how to simplify fractions, how to find a common denominator, how to find the least common multiple and the greatest common divisor.

The calculator is designed to calculate the amount of bricks or blocks needed. How many bricks do we need to build a wall of the given size, including wall openings and joints, how many bricks should we order, taking into account waste and what will be their weight.

Calculator of the amount of concrete needed to build a foundation slab or a concrete ceiling.

With this calculator you will calculate the average absolute deviation, or mean absolute deviation (MAD), of a data set is the average of the absolute deviations from a central point.