Five everyday tools that give you an answer fast

Enter your numbers or text, read the result, and copy it when you are done. Each tool shows the working so you can check it, and each one flags invalid input instead of guessing.

Find what percent one number is of another, or work out a percentage increase or decrease. Results appear as you type, and the calculation is shown beneath the answer.

Invalid entries such as letters or empty fields show a short message instead of a result. Reset clears both fields, and copy places the result on your clipboard.

Enter a date of birth and get the exact age in years, months, and days, plus the total number of days lived. A reference date can be set so you can check age on any day.

Future dates and impossible calendar dates are rejected with a clear note. Reset returns the form to its starting state.

Paste or type text to see the number of words, characters with and without spaces, sentences, and an estimated reading time. Counts update as you edit.

Empty input shows zero rather than an error. Copy places the summary on your clipboard, and reset empties the text box.

Switch pasted text between upper case, lower case, title case, sentence case, and toggled case in one step. The original text is never lost until you choose to replace it.

Empty input is flagged, and the output can be copied with one click. Reset restores the default text area.

Convert length, weight, temperature, and volume between common units. Choose the units on each side, enter a value, and the converted figure appears with the formula used.

Non-numeric values and out-of-range entries are rejected with a message. Reset returns both unit menus to their defaults.

Type or paste your numbers, dates, or text into the field. Each tool explains what format it expects, so you know what to enter before you start.

The result updates as you type, with the working shown underneath. If an input is invalid, a short message tells you what to fix rather than showing a misleading number.

Use copy to place the finished answer on your clipboard, or reset to clear the fields and start again. Every control on the page has been tested for these states.

Need more background on a calculation? Browse the Blog for step-by-step guides that explain the method behind each tool.