The most common question we hear from restaurant operators considering voice ordering isn't "how does it work?" — it's "how do I know if it pays for itself?" That's a better question, and it has a concrete answer if you're willing to pull three numbers from your own operation.
This isn't a case for voice ordering. Whether it pencils out depends entirely on your specific location's call volume, abandonment rate, and average ticket. For some operations the math is obvious. For others it isn't. This guide shows you how to find out which category you're in before signing anything.
The Three Numbers You Need
An ROI calculation for voice ordering reduces to three inputs:
- Monthly inbound call volume — total call attempts to your ordering line per month
- Current abandonment rate — percentage of those calls that go unanswered or hang up before ordering
- Average phone order value — average ticket size for phone orders (typically higher than counter, because phone orders are often group orders)
If you don't have all three of these numbers, stop here and get them before running any calculation. An ROI projection built on guesses is a vendor's story, not your math.
Getting Your Call Volume
Your phone carrier or VoIP system (RingCentral, Vonage, 8x8, Nextiva) logs inbound call attempts. This is distinct from answered calls — you want total attempts. Pull the last 90 days and average it monthly. If you're on a basic POTS line and your carrier doesn't have a portal, call and request the data or consider switching to a VoIP system that logs it natively.
If you truly can't get call attempt data, you can estimate by adding: (answered calls per month) ÷ (1 - your estimated abandonment rate). This requires knowing your abandonment rate first, which creates a circular problem — which is exactly why operators without call data should prioritize getting it before running an ROI model.
Getting Your Abandonment Rate
Answered calls ÷ total inbound attempts × 100 = answer rate. Subtract from 100 for abandonment rate. Do this calculation specifically for your peak hours (11 AM–1 PM and 5 PM–7 PM separately), not just as a daily average. Peak abandonment is the number that matters; off-peak abandonment is low everywhere and tells you little.
Industry-realistic ranges for single-line restaurant operations: 8–15% overall, 25–40% during peak hours. If your overall rate is below 8%, voice ordering's value proposition on the abandonment-recovery side is limited (though the labor cost side may still pencil out). If your peak rate is above 30%, the revenue recovery opportunity is meaningful.
Getting Your Average Phone Order Value
Some POS systems tag orders by channel (phone, walk-in, drive-thru, app). If yours does, pull it directly. If it doesn't, sample 2–3 weeks of phone orders manually: when a phone order comes in, note the ticket total in a separate log. A 3-week sample gives you enough data to calculate a reliable average. Phone order average tickets typically run 15–30% higher than walk-in tickets because phone callers are more often ordering for multiple people.
The Calculation Framework
Once you have your three numbers, the calculation follows this structure:
Step 1: Recoverable Revenue per Month
Abandoned calls per month = Monthly call volume × Abandonment rate
Example: 400 calls/month × 32% abandonment = 128 abandoned calls
Recoverable orders = Abandoned calls × Recovery rate
Recovery rate is what percentage of previously abandoned callers will successfully place an order with an automated system versus just not ordering. This is not 100%. Some callers will still hang up (they don't want to interact with an automated system, or they'll order via app instead). A realistic recovery rate is 55–75% of previously abandoned callers. Use 60% as a conservative starting estimate.
Example: 128 abandoned calls × 60% recovery = approximately 77 additional orders per month
Recovered revenue = Additional orders × Average phone order value
Example: 77 orders × $24 average ticket = $1,848/month in recovered revenue
Step 2: Labor Cost Offset
This is the second value driver and it's often underestimated. An automated phone ordering system handles calls that would otherwise require staff time. The question is: what's that staff time actually worth in your operation?
If you have a dedicated phone person during peak, the offset is straightforward: voice ordering may allow you to redeploy that person to higher-value tasks during peak (expo, customer service, counter support). In most QSR operations without a dedicated phone role, the calculation is less clean — the opportunity cost is the interruption value, which is harder to quantify but real.
A useful conservative estimate: if voice ordering handles 80% of calls that would otherwise require human time, and average call handle time is 2.5 minutes, and you have 400 calls per month at an effective labor cost of $16/hour for the person who handles them:
400 calls × 80% automation rate × 2.5 min ÷ 60 min × $16/hour = approximately $213/month in direct labor hours offset
This number is typically smaller than the revenue recovery number, but in high-volume operations (600+ calls/month) or operations with a dedicated phone role, it can be significant.
Step 3: Total Monthly Value vs. Monthly Cost
Total monthly value = Recovered revenue + Labor offset
Example: $1,848 + $213 = $2,061/month
Compare this against the monthly cost of the voice ordering solution. Typical pricing structures in the market range from $300–$800/month for a single-location implementation, sometimes with a per-call or per-order transaction fee layered on. If the solution costs $500/month and your calculation shows $2,061/month in value, the payback case is clear. If it shows $600/month in value and the solution costs $500/month, it's marginal and the decision hinges on whether your volume estimates are accurate.
Sensitivity: What Makes the Numbers Move
The ROI calculation is most sensitive to three variables:
- Abandonment rate — this is the primary driver. A location with 15% abandonment and a location with 35% abandonment at the same call volume have a 2.3x difference in the recoverable revenue calculation. Get this number right.
- Recovery rate — the assumption that 60% of previously abandoned callers will now complete orders is the biggest unknown. It depends on your caller demographics, your menu complexity, and how good the automated system actually is. If your callers are comfortable with voice automation (younger demographic, lower menu complexity), 70–75% is realistic. If your caller base is older or your menu is complex, 50–55% is safer.
- Call volume seasonality — a calculation built on a summer month may not represent November. Run the calculation on your 3-month average, not your best month.
What the Calculation Doesn't Capture
This framework is conservative by design — it only counts revenue recovery and direct labor offset. It doesn't attempt to quantify the customer experience improvement for callers who do get through (shorter wait, no hold music), the staff experience improvement from reduced interruption during peak, or the potential upsell-attach rate that a well-designed automated system can achieve by consistently offering add-ons at the right moment in the order flow.
We're not saying those benefits are small. For some operations they're significant. But they're harder to pre-calculate with confidence, so they're better treated as upside potential in your business case rather than inputs to the core ROI argument. If the math works on just recovered revenue and labor offset, any additional value is gravy. If the math only works when you include estimated upsell lift, be cautious — you're building a case on assumptions that haven't been tested in your specific environment.
Running the Numbers for Your Location
Pull your call data this week. The specific inputs you need are in the section above. A 90-minute exercise with your phone system's admin portal or a call to your carrier is all it takes to get the raw numbers. Once you have them, the calculation is arithmetic.
If the numbers show a clear positive case — total monthly value materially above the solution cost — then the decision becomes about which system is right for your POS, your caller demographics, and your operational context. If the numbers are marginal or negative, voice ordering may not be the right investment for your location right now, and that's useful to know before spending any more time on it.
The operators who get this wrong are typically the ones who skip the calculation and make the decision on demo impressiveness. Demo impressiveness is a vendor's input into your decision. Your call volume, abandonment rate, and average ticket are yours. Run your own numbers.