Instantly calculate percentage changes in your paid media metrics - or work backwards from a known % change to find the new value.
Every PPC professional has used one of these in their career. My main issue with what's out there though is the bloat - full of ads, popups and other distractions. This tool is simple, fast and free to use. It does what it says on the tin and nothing else. Calculate your % changes from old numbers to new, or reverse % calculations.
Whether you're reviewing weekly performance reports or preparing a client deck, percentage changes are the language of PPC. This tool gives you two modes:
"CPC was £1.42 last week, now it's £1.67 - that's a +17.6% increase."
"CPA was £38 and dropped 12% - new CPA is £33.44."
"CTR moved from 2.1% to 2.8% - a +33.3% relative improvement."
"Budget was £5,000 and increased 20% - now £6,000."
Raw numbers can be misleading. A £0.25 CPC increase sounds small, but if your baseline was £1.00, that's a 25% jump that could blow your budget. Percentage changes normalise comparisons across different metrics, time periods, and account sizes - making them essential for accurate reporting and optimisation decisions.
This calculator is designed for speed. No sign-up, no clutter - just enter two numbers and get your answer. Use the copy button to paste a clean summary straight into Slack, a Google Doc, or a client report.
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