JRM Calculator Enter an arithmetic expression:

Result:

Save expression (new or copy current):


   
Memory:


       


Formulas, Areas and Volumes:      1 
Measures conversion:
      2      3 
      4      5 
      6      7 

 
Rule of three:

A    is to B
as C    is to D



 
Temperature:     ºFahrenheit is equal to ºCelsius  

 
8 Time:   Subtract          
 
9 Since or Until:     -  =
 
Week of the Year       Today is
Week pertaining the date    
 
Compound interest:
  Results:
Principal:
Rate:
Term in years:
Additional monthly payment:

  Monthly payment (prin.+ int.):
Monthly payment plus addit.:
New term:
Total payment amount:
Included interest:
Without payments:    Principal + Interest:    Interest: 

 
   Instructions and examples
          (Press Alt+I to return to Calculator)
          
Add: +, Subtract: -, Multiply: *, Divide: /, Remainder: %.
Precedence: (), *, /, %, +, -.    Decimal: . point
If expression is selected (Ctrl+E):
    clear it with Supr key or a new entry,
    modify it with arrow-left or arrow-right.
Use Alt+underlined-key to move in document, and
    Tab or Shift+Tab for next or previous item.
You can use the numeric keyboard, 
    with Shift key for its arrows.
For measures conversions type in the quantity to search for 
    an equivalence, select its type with Alt+1...7 and
    open the box with Alt+Down-arrow.
    Select the desired conversion with down-arrow or up-arrow
    and Enter directly, or Alt+o, which will make the
    factor or formula to be appended to the right of the 
    expression line. Press Home key if you wish to enter to
    the left side

Examples:
    Expression: (1+2.5+3)*5-(7/3) Result: 30.1666...
    6 * 9 % 7 Result: 5
    6 * (9 % 7) Result: 12
    Sphere volume, with given radius:
       (4/3)*Math.PI*Math.pow(radius,3)
    Random number from 1 to 100:
       Math.floor(Math.random()*100+1) 

This utility is part of (also in Spanish).