Cold email bounce cost calculator: bounces, thresholds and the cost to clean
Enter your list size, the bounce rate you expect, how many contacts you email a day and across how many inboxes. The calculator estimates bounces in total, a day and per inbox, shows which published platform lines (Brevo 2%, HubSpot 5%, Instantly 5%, Amazon SES 5%, Postmark 10%) the list is over before and after the share you expect verification to remove, and prices one verification pass. Every figure is an estimate from your inputs.
The values below are examples to replace with your own. None is a benchmark, and every result is an estimate.
Unique people you plan to email, up to 1,000,000.
Your last campaign's hard bounce rate on a similar list is the best guess.
First-step sends across all inboxes.
Mailboxes the campaign rotates through.
Your assumption, not our claim. A verification report gives the real figure for your file.
Estimate, from your inputs
- Projected bounces
- 300
- Bounces a day
- 18
- Per inbox a day
- 1.8
- Removed by verifying
- 250
- Days to send the whole list
- 17
- Bounces a day that keep you at 2%
- 6
- Bounces a day that keep you at 5%
- 15
- Day the campaign passes 200 sends
- Day 1
- Bounce rate after removal
- 1%
- Projected bounces after removal
- 48
Published bounce lines, before and after removal
| Platform line | Before (6%) | After (1%) |
|---|---|---|
| Brevo 2%hard bounces above this can suspend campaigns or the account | Over | Under |
| HubSpot 5%hard bounce rate in a month at which the account may be suspended | Over | Under |
| Instantly 5%default auto-pause for a campaign, after 200+ sends | Over | Under |
| Amazon SES 5%account placed under review (10% may pause sending) | Over | Under |
| Postmark 10%must stay below this or sending is suspended | Under | Under |
Bounces arrive at about the same rate throughout a send, so a list over a line is over it from the first batch, and it shows as soon as a platform starts measuring. Google and Yahoo publish no bounce percentage; their 0.3% line is for spam complaints.
Cost to verify 5,000 contacts once
| Verifier | Cost | How it is bought |
|---|---|---|
| DeBounceas of 12 Oct 2026 | $13.80 | One month of the 5,000/mo plan |
| EmailListVerifyas of 20 Oct 2026 | $16 | One month of the 5,000/mo plan |
| SimpleVerifier | $18 | One-time packs: 2 × 2,500 emails ($9), credits never expire |
| Bounceras of 19 Oct 2026 | $28 | One month of the 5,000/mo plan |
| Emailableas of 12 Oct 2026 | $32.30 | One month of the 5,000/mo plan |
| MillionVerifieras of 19 Oct 2026 | $39 | 10,000-credit pack at $3.90 per 1,000 |
| NeverBounceas of 19 Oct 2026 | $40 | $8.00 per 1,000, billed per email |
| Clearoutas of 20 Oct 2026 | $40 | 5,000-credit pack at $8.00 per 1,000 |
| Kickboxas of 19 Oct 2026 | $40 | 5,000-credit pack at $8.00 per 1,000 |
| ZeroBounceas of 12 Oct 2026 | $69 | 5,000-credit pack at $13.80 per 1,000 |
Each vendor’s cheapest published route for one pass, read off its own pricing page on the date shown. Some cost less than us for some list sizes, and the table shows that. Prices change; confirm on the vendor’s page.
Next step
At 6% this list is over Brevo's 2% line from the first send: about 18 bounces a day.
Verifying first removes addresses the mailbox server says do not exist, so they never reach your sending inboxes. This list would cost $18 to check once here.
- Drop your list as a CSV
- See its rows, duplicates and bad formats, free
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Ready to verify now? Verify the list
Sample result
5,000 contacts at 6% bounce means about 300 bounces, 18 a day: over every 5% line from the first batch.
- Projected bounces (estimate)
- 300
- Bounces a day
- 18
- After removing 5%
- 1%
What this means for you
Removing 5% first brings the estimate to 1%, under every published line. It costs $18 to check here.
- Bounces in total, a day and per inbox
- Published 2% to 10% lines, before and after
- Removal share is your input, not a claim
- Cleaning cost across dated vendor prices
- Cold email
- Bounce rate
- Pricing
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
How do I estimate bounces for a cold email campaign?
- Enter how many unique contacts the campaign will email.
- Enter the hard bounce rate you expect if the list goes out unverified. Your last similar campaign is the best guide.
- Enter new contacts emailed a day across all inboxes, and how many inboxes share the load.
- Enter the share of the list you think verification would remove. This is your assumption; a verification run gives the real number.
- Read the bounce estimates, the before-and-after line table and the cost table. Open a vendor's pricing page from its row before you buy.
Example
- You enter
- 5,000 contacts, a 6% expected bounce rate, 300 new contacts a day across 10 inboxes, and an assumed 5% removed by verification.
- You get
- About 300 bounces, 18 a day or 1.8 per inbox, against 6 a day at 2% and 15 at 5%: over the Brevo, HubSpot, Instantly and Amazon SES lines from day 1. Removing 5% leaves an estimated 1%. One pass costs $18 here (two 2,500 packs), beside each other verifier's dated price.
- Limits
- Lists of 1 to 1,000,000 contacts. Runs in your browser.
Why do bounces matter more in cold email?
A cold list has never been mailed by you, so nobody on it has confirmed the address. Lead databases go stale as people change jobs, and sequencers send from a handful of inboxes on new domains with little reputation to absorb a bad day. A bounce counts against the sending inbox and domain the same way whether the campaign is cold or not.
Mailbox providers say this directly. Google's Email sender guidelines tell senders to reduce volume when messages start bouncing and to unsubscribe recipients with multiple bounces. Yahoo's Sender Best Practices say to remove invalid recipients promptly. Neither publishes a bounce percentage; their 0.3% figure is for spam complaints.
The percentages come from sending platforms. Brevo's 2% hard bounce line is the lowest published one; HubSpot, Amazon SES and Instantly's default auto-pause act at 5%; Postmark at 10%. Instantly checks a campaign only after 200 sends, so at a few hundred sends a day the pause can arrive on day one. The bounce rate limits by platform post has each line with its source.
How are the numbers worked out?
Projected bounces are contacts times the bounce rate. Bounces a day are new contacts a day times the rate, and per inbox divides that by the inbox count. The 2% and 5% rows show how many bounces a day those rates allow at your daily volume, so you can see how far over or under the estimate is.
Bounces arrive at roughly the same rate across a send, so the line table compares the rate itself: a list at 6% is over a 5% line from the first batch, not after some number of days. After removal, the rate is the expected rate minus the share removed, on the assumption that every removed address would have bounced. Verification also flags catch-all addresses as risky rather than valid, which this simple model does not count.
The cost table prices one pass over the list. SimpleVerifier's figure is the cheaper of its one-time packs ($9 for 2,500 emails, $19 for 10,000 emails, credits never expire) and one month of Pro at $29.99, unlimited. ZeroBounce, NeverBounce, Bouncer, Clearout, Kickbox, DeBounce, MillionVerifier, Emailable, EmailListVerify are priced on their cheapest published route for that list size, from the figures in our pricing comparisons, each dated.
Who uses this tool, and for what?
- Cold emailers
- Check whether a fresh export would trip a sequencer's auto-pause on day one, before it goes into Instantly or Smartlead.
- Agencies
- Show a client what their list's bounce rate means per inbox and per day, and what cleaning it costs, with every platform line linked to its source.
- SaaS growth teams
- Size the inbox count and daily volume for an outbound push, and see how far a cleaning pass moves the projected bounce rate.
What can’t this tool tell you?
- Every output is an estimate from your inputs. The bounce rate and the share removed are your assumptions, not measurements.
- It treats the bounce rate as even across the send. A list sorted by source or age can bounce in bursts.
- It does not model spam complaints, spam traps or catch-all addresses, which affect reputation without showing as bounces.
- Platform lines and vendor prices were read on the dates given and can change without notice.
Common questions
- What bounce rate is too high for cold email?
- Under 2% keeps you below every published sending-platform line we know of; Brevo's 2% is the lowest. At 5% you are at HubSpot's and Amazon SES's lines and Instantly's default auto-pause. Google and Yahoo publish no bounce percentage, but both tell senders to remove addresses that bounce.
- How many bounces a day can one inbox take?
- No provider publishes a per-inbox bounce allowance. The calculator shows bounces per inbox a day so you can see how the load spreads, but the rate is what platforms measure: at 2%, 30 sends a day from one inbox allow fewer than one bounce.
- How much of my list will verification remove?
- It depends on the list, which is why it is an input. Fresh, recently checked data loses little; old exports and guessed addresses lose much more. A verification run gives the real count for your file, split into valid, risky and invalid.
- Is verifying cheaper than the bounces?
- The calculator does not put a dollar figure on a bounce, because no one publishes one. What it shows is the cost to clean: from $9 for 2,500 emails here, set against a campaign that would be over a platform's line from its first batch.
- Are the competitor prices current?
- Each was read from the vendor's own pricing page on the date shown in its row. Prices change, so open the vendor's page from the table and confirm before you buy.
Sources
The calculator makes the case better than we can.
Every per-address model above recurs each time you clean. A flat plan does not.
- Unlimited verifications, no monthly cap
- The email finder and enrichment included, also unlimited
- Published limits, so nothing is a surprise later
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