Email Sending Cost Calculator
Exact monthly costs for the plans you enter — ranked cheapest-first for your send volume.
At a glance
Email Sending Cost Calculator is a free, client-side tool that computes exact monthly costs for up to five email-sending plans you enter — price, included volume and overage rate — then ranks them cheapest-first for your send volume and finds the breakeven point. No vendor prices are asserted and nothing leaves your browser.
Compare five email plans at your monthly send volume
Enter your volume once, then each provider's own plan numbers. It ranks every plan by exact monthly cost at your volume, shows the overage math line by line, and computes the breakeven point between the two cheapest options. Prices in USD per month, 100% in your browser.
| Rank | Plan | Base $/mo | Included | Overage $/1K | Overage sends | Overage cost | Monthly cost | Annual cost | $/1K sends |
|---|
How much does 25,000 sends a month cost on two example plans?
Worked example using example rates — not a vendor quote: Plan A costs $20/month including 10,000 sends with $0.90 per 1,000 beyond that; Plan B costs $35/month including 50,000 sends. At 25,000 sends per month the costs are:
The exact math, line by line
| Plan | Line | Calculation | Amount |
|---|---|---|---|
| Plan A ($20/mo, 10K included, $0.90/1K) | Base price | — | $20.00 |
| Overage (25,000 − 10,000 = 15,000 sends) | 15,000 ÷ 1,000 × $0.90 | $13.50 | |
| Monthly total | $20.00 + $13.50 | $33.50 | |
| Plan B ($35/mo, 50K included, $0.90/1K) | Base price | — | $35.00 |
| Overage (25,000 within 50,000 included) | max(0, 25,000 − 50,000) = 0 | $0.00 | |
| Monthly total | $35.00 + $0.00 | $35.00 | |
| Verdict | Cheaper by $1.50/mo ($18.00/yr) | breakeven: 26,667 sends (both $35.00) | Plan A |
These figures are hypothetical inputs, not current vendor prices. The live calculator above recomputes this exact example — "Load hypothetical example" fills it in — and the unit test suite verifies these numbers.
When do the plans flip? Breakeven volume explained
Breakeven volume is the monthly send count where two plans cost exactly the same. Below it one plan is cheaper; above it the other wins, so it is the volume where switching stops paying. It is computed from the numbers you enter — plan price, included quota and overage rate — with no estimates involved.
The calculator uses one fixed identity for every plan:
monthly cost = base + max(0, sends − included) ÷ 1,000 × overage per 1,000.
Breakeven is the smallest volume where two plans' monthly costs are equal; when their per-1K overage rates are identical
but quotas differ, the crossing sits inside the higher-quota plan's interval. In the example above, Plan A is cheaper
below 26,667 sends; at 26,667 both cost $35.00; above it Plan B stays cheaper at every volume.
Why Use This Email Sending Cost Calculator?
How to Use Email Sending Cost Calculator
Enter your monthly send volume
Type the number of emails you send per month, or plan to send.
Fill in each plan you're considering
For each slot, enter the plan name, monthly price, included sends and overage price per 1,000 — copy them from the vendor's pricing page, your quote or your latest invoice.
Read the ranked result and breakeven
The table sorts plans by monthly cost at your volume, flags overage, and shows the breakeven point between the two cheapest options. Download the CSV if you want it in a spreadsheet.
Costing a 25,000-send month with two entered plans
The engine matches your volume against each entered plan's included quota, bills any overage at the entered per-1K rate, ranks the totals, and computes the volume where the two cheapest plans cost the same. All values in this example are hypothetical inputs, not vendor prices.
Monthly sends: 25,000 Plan A: $20/mo, includes 10,000 sends, $0.90 per 1K overage Plan B: $35/mo, includes 50,000 sends, $0.90 per 1K overage
Plan A: $20.00 + (25,000 − 10,000) ÷ 1,000 × $0.90 = $20.00 + $13.50 = $33.50/mo Plan B: $35.00 + $0.00 overage = $35.00/mo Cheapest: Plan A by $1.50/mo Breakeven: 26,667 sends/mo
Technical Specifications & Engine Details
| Specification | Details |
|---|---|
| Supported Formats | SEND-VOLUME, USD-MONTHLY-PRICES, PLAN-QUOTA-DATA → USD-TOTALS, COMPARISON-TABLE, CSV |
| Execution Mode | 100% Client-Side In-Browser (client) |
| Browser Requirements | Modern browser with JavaScript and standard DOM APIs enabled. |
| Performance Constraints | Plan values are user-entered: this page asserts no vendor prices. Inputs are bounded to sane ranges (price $0–$10,000/mo; included sends 0–100,000,000; overage $0–$100 per 1K; volume 0–100,000,000/mo) and invalid entries are rejected with a hint. Deliverability, taxes, currency conversion and contact-list billing mechanics are out of scope. |
100% Client-Side Privacy Guarantee
Inputs stay on your device. Zero data is transmitted to external servers.
Frequently Asked Questions
Does this tool use current email provider prices?
How is the monthly cost calculated?
What is breakeven volume?
Can I compare plans that charge per contact instead of per email?
Is my data sent anywhere?
Methodology
Costs are calculated from the send volume, plan fees and overage rates you enter.
Last updated .