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Standard Calculator
Everyday arithmetic with percent and memory.
Enter values to see your result
Frequently asked questions
Standard vs Scientific?
Standard handles arithmetic + percent + basic powers. Scientific adds trig, log, memory, parentheses, constants.
Why the "% of" operation?
Common task — "20% of 150 = 30". Avoids manual decimal conversion.
Is division checked?
Yes — dividing by zero throws an error instead of returning infinity.
Precision?
PHP double-precision floats — accurate to ~15-17 significant digits.