All online calculators

• Substitution cipher breaker

This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded text

• Substitution Cipher Tool

The tool to encrypt/decrypt messages with simple substitution cipher given as key. It is also useful for manual cryptanalysis of substitution cipher - when you have message written in English alphabet partially decrypted with automatic tool and want to tweak the key.

• Sun position at a given date. Azimuth and elevation table.

Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments.

• Sunrise and sunset calculator

Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval Observatory Washington, DC 20392

• Sunrise and sunset time

This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer".

• Surface area of a cube
• Surface tension. Weight and volume of the drop of liquid

This online calculator calculates the weight and the volume of the drop given the surface tension, diameter of the capillary tube, and density of the liquid

• Symbol frequencies table

This online calculator builds symbol frequency table for a given message

• Synthetic division

A simple method of polynomial division.

• Tank volume

Calculator computes tank volume given its length, diameter and walls depth. Created by user's request.

• Tank Volume Calculators

Use one of these to determine your tank's volume.

• Tax deductions from personal income tax
• Team combinations with conditions like team roles and limits

This online calculator generates all possible combinations of 11 from 22 using limiting conditions like team roles and limits

• Telecommunications traffic, Erlang

The calculator gives telecom traffic in Erlang for given time span and total call duration.

• Temperature scales

Conversion between different temperature scales

• Text fitness

This online calculator computes text "fitness". That is, how similar the given text to other texts written in English language.

• Text fitness (version 2)

This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses frequencies of unigrams, bigrams and trigrams to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.

• Text fitness (version 3)

This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses logarithms of probabilites with normalization to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.

• The amount of material for the mesh

It's required to produce a mesh with predetermined length and width, roughly square meshes from tape with predetermined width. It is necessary to calculate the total length of the tape.

• The basal metabolic rate

This calculator computes BMR calories