Calculators
Free Email Open Rate Calculator (No Sign-Up Cost, Unlimited)
Email Open Rate Calculator — 100% free, unlimited, no sign-up cost.
The share of successfully delivered emails that were opened at least once — the first funnel checkpoint for any email send.
Calculate email open rate — opens as a percentage of delivered emails. It runs instantly inside GrowthGadgetAi's Marketing Toolkit — completely free, with unlimited uses, no credit cost and no credit card required.
Use the Email Open Rate Calculator online at no cost.Common tasks this tool helps with
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Try Email Open Rate Calculator free
The Open Rate formula
Open Rate = Opens ÷ Delivered × 100
The share of successfully delivered emails that were opened at least once — the first funnel checkpoint for any email send.
Example
1,200 opens out of 5,000 delivered emails.
(1,200 ÷ 5,000) × 100 = 24% open rate
Why it's free
This is pure math — the formulas below are public, verifiable and computed instantly in your browser. There was never a real cost to charge for here, so it runs free with zero credits. With the Email Open Rate Calculator, you get this without paying per generation or hitting a credit wall.
What you get
- Open rate as a percentage: unique opens ÷ emails delivered × 100
Who uses the Email Open Rate Calculator
- Email marketers testing subject lines
- Newsletter owners tracking list health
- Agencies reporting campaign engagement
How it works
- Enter your Unique opens and Emails delivered
- See your % open rate instantly, no submit button needed
- Use the number in your reporting or planning
Frequently asked questions
Is the Email Open Rate Calculator free?
Yes. Every one of GrowthGadgetAi's Marketing Toolkit tools, including the Email Open Rate Calculator, is completely free with unlimited use — no credits, no plan requirement and no credit card.
Do I need to create an account to use it?
The Email Open Rate Calculator runs without signing up — a free GrowthGadgetAi account only matters if you want your history saved, and it never requires a card.
How is the Email Open Rate Calculator's result calculated?
It's a direct formula, not an AI guess — the Email Open Rate Calculator computes your % open rate from the numbers you enter, instantly and the same way every time.
How do I use the Email Open Rate Calculator?
1) Enter your Unique opens and Emails delivered. 2) See your % open rate instantly, no submit button needed. 3) Use the number in your reporting or planning. The whole process takes about a minute and runs on this page, on desktop or mobile.
What is the formula behind the Email Open Rate Calculator?
Open Rate = Opens ÷ Delivered × 100. The share of successfully delivered emails that were opened at least once — the first funnel checkpoint for any email send.
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