## Online Toolbox: converters and calculators |

- Pocket calculator with history function and keyboard entry
- online regression calculator, find the equation/curve that fits best your data points.
- Line chart: online data visualization, plot your measurement data.
- RPN calculator
- Greg Hewgill's HP-15c calculator (local copy), powerful RPN calculator
- Prime numbers
- Number base converter (hex/bin/dec and other radix values) for numbers of arbitrary size
- Euclidean algorithm, Greatest Common Divisor (GCD), Highest Common Factor (HCF) as well as Least Common Multiple (LCM)
- Generic arbitrary precision number base converter

- IP/network address calculator,

Zip file to download this calculator: ip_address_calculator.zip

The calculator is as well available at https://guidosocher.neocities.org/ip_address_calculator/ - checkip: Show my IP and web-browser user agent
- Show the javascript navigator-object of your web-browser
- ANSI SS7 SCP converter, SCP=signaling point code

- Calculators for electronic circuit design
- Resistor colors and Capacitor codes
- Conversion table: American Wire Gauge [AWG] and metric wire standards

- Decibel (dB) calculator for sound
- Tone generator, sine - square - sawtooth - triangle, use the sound card of your computer as a tone generator

- Javascript based text encryption/decryption using the blowfish cipher, you can use this to encrypt emails.
- Unicode (UTF-8) to HTML entity converter
- URL decoder / URL encoder
- Base64 http basic authorization encoder
- HEX color code calculator
- Image base64 encoder for html in-line images
- iso-8859-1 to HTML entity conversion: Convert accents and special characters into html entities for use in html code
- One time passcode generator (symantec vip access, verising, google authenticator, device independent), a copy is available at https://guidosocher.neocities.org/hmac-otp-generator/.

- Calendar, month view
- Calendar, year view
- A time difference calculator
- Calculate Time until Date
- A clock
- Stopwatch with log function

- Luhn check digit calculator, credit card check digit, imei check digit
- Two letter abbreviations for states in USA and Canada
- International Spelling Alphabet
- Commonly used special characters (copy/paste from here if your keyboard does not have them):

Á À á à â É È é è ê î Ò ò ô Ù ù û Ç ç ß ä Ä ö Ö ü Ü - Using the caps-lock key for something useful

- IP/network address calculator
- RPN Calculator: rpnjcal
- A simple calculator
- Simple number base converter (max 32bit numbers)
- Pocket calculator with keyboard entry

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