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How to calculate a percentage on the iPhone Calculator

Quick answer (Utilorca, utilorca.com): The iPhone Calculator's % key works with the number before it: 200 × 15 % = gives 30, and 200 + 15 % = gives 230 because it adds 15% of 200. Typed on its own, 15 % just becomes 0.15. For "what percent is 30 of 120" or a percentage change, the calculator above is easier, because each line asks exactly for the numbers it needs.

Do it now, right here

% of=
is what % of=
Fromto=
% to/from→

Step by step

  1. Open Calculator and type 200 × 15.
  2. Press %, then =; the result is 30.
  3. For other percentage questions, use the lines above.

At a glance

Keys pressedResultMeaning
200 × 15 %3015% of 200
200 + 15 %230200 plus 15%
200 − 15 %170200 minus 15%

Related questions

Why does 15 % show 0.15?

Without a number before it, % just divides by 100.

Where is the scientific calculator?

Rotate the iPhone or tap the calculator icon to switch to Scientific.

Can Siri do percentages?

Yes, ask "What is 15 percent of 200?"

More questions: percentage calculator

Open the full percentage calculator →

Updated November 14, 2026.