Lead Source ROI Calculator
Compare ROI, cost per acquisition, and revenue across up to five lead sources to find your highest-return channel.
Google Ads
Revenue / mo
$16.0k
ROI
+433%
Cost / deal
$938
LinkedIn Outreach
Revenue / mo
$12.0k
ROI
+1400%
Cost / deal
$333
Referrals
Best ROIRevenue / mo
$15.0k
ROI
+7400%
Cost / deal
$67
Combined summary
Want to track this automatically? HelloGrowthCRM tags every lead with its source and tracks close rates per channel so you always know where your best deals come from. See lead management and analytics and reporting.
About lead source ROI
What does this tool do?
Calculates revenue, ROI percentage, and cost per acquisition for each lead channel using your real conversion rates and spend.
Why does it matter?
Knowing which channels produce the best ROI helps you allocate budget more confidently instead of spreading spend equally across all sources.
Definition
Lead source ROI measures the return on investment for each marketing or sales channel: (Revenue minus Cost) divided by Cost, expressed as a percentage.
Assumptions
- Close rates are applied uniformly across all leads from a given source.
- Deal value is set as an average — seasonal or segment variation will affect real output.
How do you interpret your results?
A high ROI channel with low deal volume may not be scalable. Balance ROI with lead volume when deciding where to invest more budget.
How can you improve your numbers?
Track by CRM source
Tag every lead with its source in your CRM so historical close rates reflect actual performance rather than estimates.
Include time cost
Add the cost of sales rep time per channel to get a truer cost per acquisition across inbound vs. outbound sources.
Track lead source ROI automatically in HelloGrowthCRM
HelloGrowthCRM tags every lead with its source, tracks close rates per channel, and shows you ROI without a spreadsheet.
What the Lead Source ROI Calculator does
The Lead Source ROI Calculator compares up to five marketing or sales channels side by side. For each one you enter leads per month, monthly cost, close rate, and average deal value; it returns monthly revenue, ROI as a percentage, and cost per closed deal, and marks the channel with the highest return. Underneath, a summary totals monthly spend and monthly revenue across every channel and names the current best performer.
Most small businesses know their total marketing spend and their total revenue and almost nothing in between. That is enough to know whether marketing works and not enough to decide what to cut. Splitting the numbers by channel turns an argument about opinion into an arithmetic problem: the channel everyone likes may be producing leads that never close, and the boring one may be quietly carrying the pipeline.
The maths is deliberately simple and it inherits the quality of your inputs. It applies one close rate to every lead from a channel, one average deal value across all wins, and counts only the cost you type in - so unless you include your own time, an outbound or referral channel will always look cheaper than it is. It also cannot see sales cycle length, so a channel with slow, large deals looks weak in a monthly view.
How to use the Lead Source ROI Calculator
List the channels you actually spend on
Name up to five: paid search, referrals, outbound, events, whatever applies to you. The comparison is only as honest as the categories, so avoid a catch-all bucket that quietly absorbs half your leads.
Enter leads per month from each channel
Use a real count from the last full month or an average of the last three, not a good month you remember fondly. If you cannot count leads by source at all, that gap is the first thing worth fixing.
Use close rates taken from closed deals
Calculate the rate from what actually closed rather than from impression. Estimated close rates are the single largest source of error in this comparison, and they run optimistic far more often than they run low.
Include every cost you can reasonably attribute
Ad spend, tool subscriptions, agency fees, event costs, and a fair estimate of the hours your team puts in. Leaving out labour is what makes outbound and referral channels look unbeatable when they are not.
Compare cost per deal, not only ROI
The badge marks the best percentage return; the cost per deal figure tells you what growth would actually cost. Read both columns before moving budget, because a channel can win on ROI and still be the wrong place to put another thousand in spend next month.
How to read your results
The highest ROI percentage is not automatically the channel to invest in. Referrals routinely post the best return and the worst scalability - spending twice as much on a channel that produces ten leads a month may simply not be possible. Read ROI next to lead volume: a strong return on a small base tells you to protect that channel, while a moderate return on a large base is usually where extra budget can actually go.
The mistake that ruins this comparison is inconsistent attribution. If referrals get credited whenever somebody mentions a friend, but paid search is only credited on last click, the two channels are not being measured the same way and the winner is decided by bookkeeping rather than by performance. Agree one rule for tagging a lead to a source, apply it everywhere, and rerun the comparison monthly.
Real-world examples
A commercial cleaning company deciding whether to renew an ad budget
Paid search produced the most leads and the fewest signed contracts, and nobody had put those two facts side by side before. Once close rate and average contract value went in per channel, the referral column showed a fraction of the volume and several times the return. Half the ad budget moved to a referral incentive the following month.
A B2B services firm defending a trade show line item
Finance saw only the event invoice and wanted it gone. Entering the show as a channel, with its full cost and the deals it produced over the following quarter, put its cost per deal in line with the paid channels. The line item survived, with an agreement to track it the same way next year.
A two-person agency deciding where the founder's time goes
Adding an estimate of the founder's hours as a cost turned outbound from the apparent winner into the most expensive channel per deal they had. They kept doing it, because it was the only channel they could switch on at will, but capped the hours and shifted effort toward partner referrals over two quarters.
Lead Source ROI Calculator — frequently asked questions
Quick answer
How do I calculate lead source ROI?
- Which lead source is typically the most cost-effective