
Click-to-Open Rate (CTOR): Formula, Benchmark & How to Improve It
Click-to-open rate (CTOR) tells you whether your email content actually earns clicks once someone opens it. Here is the formula, the 10-18% benchmark, and how CTOR differs from CTR.
Connect your email platform and find out in 60 seconds.
Connect your email, revenue, and lead metrics to automatically sync data and measure true email marketing campaign success in one place.
From data to insights in minutes. No complex setup, no learning curve. Start tracking your email marketing performance today.
Connect your email marketing platform to Email Calculator via API, or start with manual data entry on the free plan. No integrations needed.
Open rates, clicks, conversions, and ROI are calculated as soon as data arrives. Spot trends, compare campaigns, and see what needs fixing.
Compare against industry benchmarks, see what's working and what isn't, and get AI-powered recommendations to improve your next campaign.
Export reports in PDF, PowerPoint, Excel, Word, CSV, and HTML. Schedule them to send daily, weekly, or monthly on paid plans.
Stop wasting hours copying metrics between platforms. Email Calculator automatically tracks revenue per campaign, connects 55+ APIs, provides AI-powered insights, and delivers automated health scores with actionable recommendations—all in one beautiful dashboard.

Acoustic
ActiveCampaign
ActiveTrail
Adobe Campaign
Amazon SES
AWeber
Benchmark
Brevo
Campaign Monitor
Constant Contact
ConvertKit
Customer.io
Drip
Eloqua
GetResponse
Acoustic
ActiveCampaign
ActiveTrail
Adobe Campaign
Amazon SES
AWeber
Benchmark
Brevo
Campaign Monitor
Constant Contact
ConvertKit
Customer.io
Drip
Eloqua
GetResponse
Acoustic
ActiveCampaign
ActiveTrail
Adobe Campaign
Amazon SES
AWeber
Benchmark
Brevo
Campaign Monitor
Constant Contact
ConvertKit
Customer.io
Drip
Eloqua
GetResponse
Acoustic
ActiveCampaign
ActiveTrail
Adobe Campaign
Amazon SES
AWeber
Benchmark
Brevo
Campaign Monitor
Constant Contact
ConvertKit
Customer.io
Drip
Eloqua
GetResponse
HubSpot
Klaviyo
Mailchimp
MailerLite
Mailgun
Mailjet
Moosend
Omnisend
Pardot
Salesforce
SendGrid
Shopify
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Typeform
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Mailgun
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Pardot
Salesforce
SendGrid
Shopify
Stripe
Typeform
Webflow
HubSpot
Klaviyo
Mailchimp
MailerLite
Mailgun
Mailjet
Moosend
Omnisend
Pardot
Salesforce
SendGrid
Shopify
Stripe
Typeform
Webflow
HubSpot
Klaviyo
Mailchimp
MailerLite
Mailgun
Mailjet
Moosend
Omnisend
Pardot
Salesforce
SendGrid
Shopify
Stripe
Typeform
Webflow
Everything you need to know about Email Calculator
Email Calculator is a campaign analytics platform that helps marketers measure and optimize email performance. Connect 55+ platforms or enter data manually. The platform calculates KPIs like open rate, CTR, CTOR, ROI, and conversion rate in real time with visual analytics and recommendations.
Free — Up to 1 report, manual data entry, AI (with your API key), Campaign Story, Compare, and chart customization.
Starter — £9/mo or £90/yr — Full platform access, 250 API requests/month, all integrations, AI insights, scheduled reporting, and exports (PDF, PowerPoint, Excel, Word, HTML, CSV).
Growth — £29/mo or £290/yr — Everything in Starter, plus 2,000 API requests/month, 3 workspaces, 3 team members, and white-label options.
Scale — £79/mo or £790/yr — Everything in Growth, plus 10,000 API requests/month, 10 workspaces, 10 team members, and priority support.
Yes. Start free with up to 1 report using manual data entry. Upgrade to Starter, Growth, or Scale when you need API integrations, exports, and higher limits. Your existing reports carry over automatically. No credit card required to start.
Email Calculator connects to 55+ platforms: Email (Mailchimp, Klaviyo, HubSpot, Brevo, ActiveCampaign, SendGrid, and more), ROI (Shopify, WooCommerce, Stripe, PayPal, Square, and more), and Lead (Typeform, Google Forms, Jotform, Calendly, and more). Visit the Platforms page for the full list.
No. The Free plan works with manual data entry — no API keys needed. API integrations are available on paid plans. Add your platform API keys in settings to enable automatic data syncing.
Email marketing strategy, campaign benchmarks, metrics guides, and reporting best practices. Written for marketers who want better results.

Click-to-open rate (CTOR) tells you whether your email content actually earns clicks once someone opens it. Here is the formula, the 10-18% benchmark, and how CTOR differs from CTR.

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Labor Day 2026 is Monday September 7, and the sends that perform land in the four days before the weekend — not on the holiday itself. Here is when to send, what to include, and the 2026 benchmarks to plan against.