instaCalc is an excellent concept if you want the idea of creating calculators on something i.e. Lets say you have a formula for calculating on Various ways of calculating PI and then you want to share it with you friends. InstaCalc also gives a live preview to whatever you type in. You can even have multiple formulas available in the same calculator.

insta calculator

Basically instacalc has table like structure. Every row is calculated and any variable you define in first row can be used in second i.e.

• picalc = ((sides+sides*sqrt(.5-.5*cos(180-(360/sides))))*sin(360/sides))/4*sin(90-(180/sides))*sqrt(.5-.5*cos(180-(360/sides)))
• accuracy = 100-abs(((picalc-pi)/pi)*100)

You get results for every row to make sure if there any problem. It acts like an interpreter. The best part I liked was it can be shared and even embedded in the sites. 

We had talked about Online Calculators , the best scientific calculators and the most powerful desktop calculator , Read it and find which suits your need.