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Type an expression and press Enter. Use functions, constants and your own variables (e.g. r = 3 then pi * r^2). ansis the last result. ↑/↓ recall previous entries.
Functions & constants
Operators: + - * / %, power ^, factorial !, parentheses.
Functions: sin cos tan, asin acos atan, atan2, sinh cosh tanh, ln log log2, sqrt cbrt exp, abs sign round floor ceil, pow hypot min max fact.
Constants: pi, e, tau, phi · Last result: ans.
Variables: assign with name = expression; reuse anywhere.
About this tool
This is an expression calculator built for site and office maths, not just a four-function pad. Type full expressions with functions and constants, define your own variables, and recall earlier results from the history. Switch to Notepad mode (same page, same engine) when you want a full takeoff working with units, GST and running totals instead of a single line.
How to use it
- Type an expression like 2400/600 or sin(45) and press Enter.
- Define a variable, e.g. r = 3, then use it in later expressions such as pi * r^2.
- Use ans to reuse the last result in your next line.
- Press ↑ or ↓ to recall and re-run previous entries, or switch to Notepad for multi-line takeoff working.
FAQ
Does this cost anything?
No — everything on this page is free, with no limits on use.
Is my data uploaded anywhere?
No. The calculator runs entirely in your browser; nothing you type is sent anywhere.
Can I switch between degrees and radians?
Yes — the calculator supports both deg/rad modes for trig functions.
What's the difference between Pad and Notepad mode?
Pad is this one-line expression calculator with history. Notepad is the multi-line takeoff mode with variables, units, GST and running totals — same page, same maths engine.