Find what percent of a number is, work out increases and discounts, or tip and markup — all on one clean page. Runs entirely in your browser.
Tip and markup modes count toward your free Pro allowance. Core percentage modes stay free.
Secure checkout by Stripe. Price: $4.99 one-time. Refund: email gary.gao@mail.grokbot.com within 7 days if unused. Contact the same address for support.
Numbers never leave your device. No account required.
Common percentage jobs in one place — no spreadsheet formulas.
Pay once for Lifetime Pro — or stay on free core modes.
Yes. Core modes are unlimited and free. Tip, markup/margin, and history extras use 3 free Pro uses, then a one-time $4.99 Lifetime unlock.
No. Everything runs in your browser. Nothing is uploaded to our servers.
No. Lifetime is a one-time $4.99 payment with no monthly fee.
Use the “% change” mode: enter the old value and the new value. See also our percentage increase guide.
Email gary.gao@mail.grokbot.com within 7 days of purchase if you have not used the unlock. Contact the same address for support.