Key takeaway
CTR = (clicks ÷ impressions) × 100. 250 ÷ 10,000 = 2.5%.
Signals relevance — not purchases.
What it means
How often viewers clicked when shown the ad.
Norms differ by channel.
High CTR + weak conversion can mean mismatch.
When you would use it
Creative/audience tests.
Always pair with downstream metrics.
How to use the tool
Use the matching TCB Tools page and work top to bottom:
- Open the CTR Calculator.
- Enter clicks and impressions.
- Compare one change at a time.
No account is required. Results update as you type.
Formula / method + worked example
CTR = (Clicks ÷ Impressions) × 100.
2.5% example.
Cannot exceed 100% with valid inputs.
How to read the result
Rising CTR with stable conversion is healthy.
Falling CTR may mean fatigue.
Planning aid.
Common mistakes
- CTR while CPA explodes. Optimize funnel.
- Cross-channel compares. Stay in-format.
- Tiny samples. Wait.
- Hidden bad placements. Break down.
- Two variables at once. Isolate.
Related ideas
Fatigue shows in CTR early.
Search queries explain CTR.
If you are new, read once for the story, then again for the clicks you will make.
Write inputs down before changing live budgets or deleting files — calm beats guesswork.
Note the date range, currency or filename so teammates can reproduce the result.
Interactive math and many file jobs run in your browser here; treat outputs as planning aids, not certified professional advice.
When a result looks too good, recheck definitions: units, filters and windows hide surprises.
Practice with example numbers first, then replace them with trusted exports.
Small disagreements between systems are often rounding or filters — investigate before panicking.
Consistent naming, windows and currencies beat clever one-off spreadsheets.
Operators who revisit CTR weekly catch drift earlier than teams who only look after emergencies.
Teach one teammate how you measure CTR; shared definitions prevent quiet disagreement.
Bookmark the guide and the tool together so beginners always have both the why and the workspace.
When unsure about CTR, reduce scope: one campaign, one file, one list — prove the method, then scale.
Screenshots of inputs beside outputs speed audits when someone questions CTR.
If leadership wants only a headline, still keep working notes for CTR in your own folder.
Seasonality and promotions change CTR; annotate the calendar when comparing periods.
Automation helps, but a human still owns success criteria for CTR.
Revisit assumptions about CTR after tool, tracking or pricing changes.
A short checklist for CTR beats relying on memory during busy weeks.
Fatigue shows in CTR early.
Search queries explain CTR.
If you are new, read once for the story, then again for the clicks you will make.
Write inputs down before changing live budgets or deleting files — calm beats guesswork.
Note the date range, currency or filename so teammates can reproduce the result.
Interactive math and many file jobs run in your browser here; treat outputs as planning aids, not certified professional advice.
When a result looks too good, recheck definitions: units, filters and windows hide surprises.
Practice with example numbers first, then replace them with trusted exports.
Small disagreements between systems are often rounding or filters — investigate before panicking.
Consistent naming, windows and currencies beat clever one-off spreadsheets.
Operators who revisit CTR weekly catch drift earlier than teams who only look after emergencies.
Teach one teammate how you measure CTR; shared definitions prevent quiet disagreement.
Bookmark the guide and the tool together so beginners always have both the why and the workspace.
When unsure about CTR, reduce scope: one campaign, one file, one list — prove the method, then scale.
Screenshots of inputs beside outputs speed audits when someone questions CTR.
If leadership wants only a headline, still keep working notes for CTR in your own folder.
Seasonality and promotions change CTR; annotate the calendar when comparing periods.
Automation helps, but a human still owns success criteria for CTR.
Revisit assumptions about CTR after tool, tracking or pricing changes.
A short checklist for CTR beats relying on memory during busy weeks.
Fatigue shows in CTR early.
Search queries explain CTR.
If you are new, read once for the story, then again for the clicks you will make.
Write inputs down before changing live budgets or deleting files — calm beats guesswork.
Note the date range, currency or filename so teammates can reproduce the result.
Interactive math and many file jobs run in your browser here; treat outputs as planning aids, not certified professional advice.
When a result looks too good, recheck definitions: units, filters and windows hide surprises.
Practice with example numbers first, then replace them with trusted exports.
Small disagreements between systems are often rounding or filters — investigate before panicking.
Consistent naming, windows and currencies beat clever one-off spreadsheets.
Operators who revisit CTR weekly catch drift earlier than teams who only look after emergencies.
Teach one teammate how you measure CTR; shared definitions prevent quiet disagreement.
Bookmark the guide and the tool together so beginners always have both the why and the workspace.
When unsure about CTR, reduce scope: one campaign, one file, one list — prove the method, then scale.
Screenshots of inputs beside outputs speed audits when someone questions CTR.
If leadership wants only a headline, still keep working notes for CTR in your own folder.
Seasonality and promotions change CTR; annotate the calendar when comparing periods.
Automation helps, but a human still owns success criteria for CTR.
Revisit assumptions about CTR after tool, tracking or pricing changes.
A short checklist for CTR beats relying on memory during busy weeks.
Fatigue shows in CTR early.
Search queries explain CTR.
If you are new, read once for the story, then again for the clicks you will make.
Write inputs down before changing live budgets or deleting files — calm beats guesswork.
Note the date range, currency or filename so teammates can reproduce the result.
Interactive math and many file jobs run in your browser here; treat outputs as planning aids, not certified professional advice.
When a result looks too good, recheck definitions: units, filters and windows hide surprises.
Practice with example numbers first, then replace them with trusted exports.
Small disagreements between systems are often rounding or filters — investigate before panicking.
Consistent naming, windows and currencies beat clever one-off spreadsheets.
Try the tools
Try CTR Calculator.
