Calculate the real cost of downtime and the value of a rescue
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Rescue build calculator guide
Estimate the value of emergency site fixes and the cost of delayed action on failed e-commerce projects. Planning estimate of loss avoided by acting now vs. waiting; actuals vary by context.
What this tool does
Calculates how much money you’re losing from downtime, conversion drops, and brand damage.
Shows how quickly a rescue fix can pay for itself.
Lets you compare “do nothing” versus “rescue now” scenarios.
Updates results as you change your inputs, no waiting.
Explains every calculation with live formulas, so you always know how the numbers add up.
Calculates how much revenue you miss out on while your site isn’t live
Separates what you can’t recover from what you can still use from previous work
Focuses only on new money you plan to spend, so ROI is clear
Shows every calculation with your own numbers as you type
Updates results instantly with every change
How it calculates
Works out lost revenue by multiplying your monthly sales with the number of days affected
Adds up direct losses, conversion drops, and brand reputation hits all at once
Standard mode uses every affected day for all loss types
Conservative mode applies a safety factor of 0.75 unless you split downtime and impairment
Gives you key numbers like ROI, how many times your investment pays off, and how long it takes to break even
Works out your missed revenue by multiplying expected monthly sales with the number of delay days
Adds in any short-term brand reputation loss if your launch delay is public
Subtracts any part of your previous spend that you can reuse
Only counts new rescue spending for ROI and payback
Gives you key numbers like ROI, how many times your investment pays off, and how long it takes to break even
What you’ll get
See the total loss you avoid in both standard and conservative views
Get your ROI as a percentage based on your new rescue investment
See how much loss you avoid for every dollar spent
Payback time is shown in days and months so you know when you break even
Get a status rating like excellent, strong, moderate, or poor
See the total loss you avoid by launching sooner
Get your ROI as a percentage based on your new rescue investment
See how much loss you avoid for every dollar spent
Payback time is shown in days and months so you know when you break even
Get a status rating like excellent, strong, moderate, or poor
What to enter
Monthly revenue before the issues started
Number of affected days as a whole number
Percentage drop in conversion rate during the problem period
Estimate for brand impact as a percentage
Amount you plan to invest in the rescue
Available budget for planning which doesn’t affect ROI
Your expected monthly revenue after launch
Number of days until you can realistically go live
Amount already paid to a previous vendor
Percentage of that spend you can still use
Rescue investment needed to complete project and launch
Brand impact percentage if the delay hurts your reputation or demand
Assumptions & limits
All types of losses are counted together
Everything is based on revenue, not profit
Brand impact is short-term only
Conservative mode uses a safety factor of 0.75 unless you split downtime and impairment
Inputs need to be positive numbers and percentages between 0 and 100
ROI is shown with one decimal for clarity
No revenue comes in before launch, so all delay days are counted as lost opportunity
Only new rescue spending is used for ROI, not what you already spent
Any reusable work from before is counted as a credit to reduce your costs
Brand impact is optional and should be a small percentage unless the delay was public
Inputs need to be positive numbers and percentages between 0 and 100
ROI is shown with one decimal for clarity
Example defaults and live updating
Standard and conservative views show ROI and payback and update with every change
Change any field and the example numbers refresh instantly
ROI is always based on your rescue investment, not your overall budget
Results are displayed with one decimal so they’re easy to read
Change any field and see the example numbers refresh instantly
ROI is always based on your rescue investment, not your overall budget
Results are displayed with one decimal so they’re easy to read
Delay window uses your current delay days and expected revenue
Salvage credit updates automatically when you change inputs
Live breakdown of how your results are calculated
Total loss avoided:
Net savings:
ROI:
Multiple:
Payback:
Conservative note:
Total before rescue:
Net benefit:
ROI:
Multiple:
Payback:
Rescue build inputs
What your site made each month before problems started
Total days your site was down or not working right. If you had both downtime and impaired days, split them to avoid double-counting
Down + impaired days exceed affected days.
Percentage drop in your conversion rate during the problem period
Estimated short-term hit to your reputation or demand
Budget available for rescue work
The amount you plan to spend now to fix the site and get back on track
Use the slider to test scenarios quickly
Investment exceeds available budget.
Rescue build value analysis
Direct revenue loss
Revenue not realized during full downtime across the affected days.
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Conversion-related revenue loss
Revenue lost from reduced conversion rate during the impaired period.
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Brand-related revenue loss
Near-term revenue impact from demand/reputation drop tied to the incident.
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Total loss without rescue
Direct + conversion + brand losses for the affected period.
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Rescue investment
The amount you plan to spend now; ROI calculations use this value.
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Net loss avoided
Total loss without rescue minus your rescue investment.
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Return on rescue investment
Enter monthly revenue, affected days, and rescue investment to begin.
Multiple
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Payback
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Status
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Pre‑launch inputs
What you think you’ll make each month once your site goes live
DHow many days until your site can realistically launch
Money you’ve already invested on the project with previous agency
Part of your earlier spend that still counts toward the new build
What you still need to spend to get the site live
Small percentage if the launch delay hurts your reputation or demandy