Percent change

Client

How much did a value grow or shrink in percent terms—see also percentage calculator.

About Percent change

Calculate percentage increase or decrease from an old value to a new one—local math in your browser. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

+25% (increase)

Nearby workflows on Toolcore

  • Percentage calculator — Percent of a value, ratio to percent, and percent change—no server round-trip. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.
  • Date difference — Calendar days between two dates—pair with the timestamp or unit tools as needed. when units or numeric output should be checked on a related calculator.
  • Number to words — Spell non-negative integers as English words—short-scale thousand/million/billion—in your browser. when units or numeric output should be checked on a related calculator.

Common use cases

  • Compare before/after prices or KPIs in percent.
  • Explain growth rates in reports.

Common mistakes to avoid

  • Swapping old and new

    Percent change is relative to the old (starting) value.

FAQ

Can the old value be zero?

No—percent change divides by the old value.

Is data uploaded?

No. Math runs locally.

More tools

Related utilities you can open in another tab—mostly client-side.