InstaCalc Online Calculator
hotel, flight, food
The simplest way to build and share live calculations.
No signup required · Zero install
Instacalc shows your work: types like a note, solves like a spreadsheet, and shares like a link. Every step is readable, every number is live, and anyone who opens your link can tweak the inputs and understand how you got the answer. From the creator of BetterExplained.com.