Percentage formulas

X% of Y = (X / 100) × Y
X is what % of Y = (X / Y) × 100
% change from X to Y = ((Y − X) / X) × 100
Increase X by Y% = X × (1 + Y / 100)
Decrease X by Y% = X × (1 − Y / 100)

Frequently Asked Questions

Is the Percentage Calculator free to use?

Yes, the Percentage Calculator is 100% free to use. There are no subscriptions, no sign-ups, and no hidden fees.

Is my data safe when using the Percentage Calculator?

Absolutely. All calculations performed by the Percentage Calculator happen locally in your web browser. We do not store, track, or transmit your inputs or results to any server.

How accurate is the Percentage Calculator?

Our Percentage Calculator uses industry-standard formulas and methodology. You can view the exact formula and calculation logic used in the methodology section above to verify the math yourself.

Can I use the Percentage Calculator on my mobile phone?

Yes! The Percentage Calculator is fully responsive and works seamlessly on all devices including smartphones, tablets, and desktop computers.