Online Toolbox: converters and calculators
Math
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.
https://www.desmos.com/calculator
, online function plotter.
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
Networking
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
Show the javascript navigator-object of your web-browser (user agent and other data)
ANSI SS7 SCP converter
, SCP=signaling point code
Electronic
Calculators for electronic circuit design
Resistor colors and Capacitor codes
Conversion table: American Wire Gauge [AWG] and metric wire standards
Sound
Decibel (dB) calculator for sound
Tone generator, sine - square - sawtooth - triangle
, use the sound card of your computer as a tone generator
Unit converter
Units conversion
cm to inch conversion with fractions
Encoding
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
Web based one time passcode generator
, edit and save on your device (e.g your phone), works with: symantec vip access, verisign, google authenticator, OATH-TOTP app, microsoft MFA, Amazon, ...
Web bassed one time passcode generator for multiple tokens
, edit and save on your device (e.g your phone), works with: symantec vip access, verisign, google authenticator, OATH-TOTP app, microsoft MFA, Amazon, ...
Oneline one time passcode generator
(symantec vip access, verisign, google authenticator, device independent), a copy is available at
https://guidosocher.neocities.org/hmac-otp-generator/
.
Time and date:
Calendar
, month view
Calendar
, year view
A time difference calculator
Calculate Time until Date
A clock
Stopwatch with log function
Misc:
Luhn check digit calculator
, credit card check digit, imei check digit
Two letter abbreviations for states in USA and Canada
International Spelling Alphabet
show browser screen sizes
, show javascript window and screen dimensions
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
Mini tutorial:
Learn javascript and html forms
Mini tutorial:
Learn javascript and html buttons
Older versions
I like to keep older versions to not break any bookmarks.
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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© Guido Socher,