Updated · Methodology: named formula library
Newsletter Open Rate
Calculate email open rate as % of delivered.
4,500 is 45.0% of 10,000.
Open Rate Benchmarks
Newsletter average: 35–45% open rate. Substack avg: 50%+ for paid. iOS Mail Privacy inflates opens — use clicks for true engagement signal.
Worked Example
4500% of $10,000
- base
- 10000
- rate
- 4500
- Result
- $450,000
$10,000 × 4500% = $450,000.
When to Use This Calculator
- Compare newsletter performance
Limitations & Common Mistakes
- Results are estimates from your inputs.
- Verify with current data for major decisions.
Frequently Asked Questions
How is the percentage computed?
(Opens / Delivered) × 100. The result tells you what fraction of the Delivered the Opens represents. For inverse questions ("what's X% of Y?"), swap the inputs accordingly.
What if my percentage is over 100%?
Means Opens exceeds Delivered. Common in growth calculations (sales doubled → 200%) or ratios where the "part" can legitimately exceed the "base." If unexpected, double-check your inputs.
Should I round the result?
For reporting: round to 1 decimal place (e.g., "23.4%"). For internal calculations: keep full precision. Conversion rates and engagement metrics conventionally show 2 decimals (e.g., "3.42% CTR").
What's a meaningful percentage in my context?
Depends on the metric. Conversion rate: 1–5% typical for SaaS landing pages. Engagement rate: 3–6% for mid-tier influencers. Tax rate: federal effective is 12–22% for most middle-class earners. Compare to industry benchmarks to interpret your number.
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