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Set the lead load per rep before follow-up quality falls apart.
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- Claude, via MCP
How many inbound leads can one SDR handle?
Work out quality touches per day (selling hours × 60 ÷ minutes per touch), divide by touches per lead in your cadence, then multiply by working days. Five selling hours at 8 minutes a touch and a 7-touch cadence gives about 5.4 new leads a day, or 113 a month, per SDR.
You’re over capacity, 900 leads against room for 563. Either leads get worked poorly or dropped. You’d need ~8.0 SDRs to cover it at full cadence.
"Quality touch" time is where plans break, padding cadence with low-effort touches inflates capacity but not results.
About this calculator
SDR headcount decisions usually get made on gut feel, "we're drowning" or "we have room", when the real question is arithmetic: how many leads can a rep actually work at a real cadence, and does that multiply out to cover your inbound volume. This planner builds capacity up from selling hours and touch time rather than down from a headcount target, so you can see exactly where the ceiling is.
How to use it
- Enter SDRs on the team, selling hours per day each (after meetings, admin, breaks), and working days per month.
- Enter minutes per quality touch, the real time a properly-worked call, email, or LinkedIn touch takes, and touches per lead, how many touches your cadence requires before moving on.
- Enter inbound leads per month.
- Read leads worked per rep per day, team monthly capacity, capacity utilization, and reps needed to cover the current inbound volume.
Methodology
Touches per day is (selling hours × 60) ÷ minutes per touch, how many individual touches a rep can physically execute in their selling hours.
Leads per rep per day is touches per day ÷ touches per lead, since a full cadence spreads several touches across each lead rather than one touch per lead.
Team monthly capacity is leads per rep per day × SDRs × working days per month, total leads the team can properly work in a month. Capacity utilization is inbound leads ÷ that capacity, as a percentage.
Reps needed is inbound leads ÷ (leads per rep per day × working days), the headcount required to work every lead at full cadence, given as a decimal so you can see how close you are to needing a full additional hire versus a partial capacity gap.
The model assumes every touch is a genuine quality touch at the stated minutes-per-touch figure. Padding cadence with low-effort touches to hit an activity number inflates capacity on paper without improving actual results, the ceiling this tool computes only holds if the touch quality is real.
SDR capacity from time, touch length and cadence
Touches per day = Selling hours × 60 ÷ Minutes per touch Leads per rep per day = Touches per day ÷ Touches per lead Team monthly capacity = Leads per rep per day × SDRs × Working days Utilisation = Inbound leads ÷ Team monthly capacity × 100 Reps needed = Inbound leads ÷ (Leads per rep per day × Working days)
- Selling hours
- Hours a day each SDR spends on prospect contact, after meetings, admin and training.
- Minutes per touch
- Average time for one quality touch: research, a call attempt or a personalised email, plus logging it.
- Touches per lead
- Number of touches in your cadence for each new lead.
- Working days
- Selling days in the month, after holidays.
The model treats capacity as steady state: each day an SDR starts a share of new leads and continues cadences already running. Utilisation over 100% means some leads get a shorter cadence or none at all. Faster touches raise capacity on paper, so check whether a shorter touch is still a quality touch before cutting minutes.
Worked example: five SDRs and 900 inbound leads a month
An inbound SDR team of five spends about five hours a day on prospect contact. A quality touch, including a quick look at the company and logging the call, takes about eight minutes. Each lead gets seven touches across calls, emails and WhatsApp. There are 21 working days in the month and 900 inbound leads.
- Touches per day = 5 × 60 ÷ 8 = 37.5.
- Leads per rep per day = 37.5 ÷ 7 = 5.36.
- Team monthly capacity = 5.36 × 5 × 21 = 562 leads.
- Utilisation = 900 ÷ 562 = 160%.
- Reps needed = 900 ÷ (5.36 × 21) = 8.0 SDRs.
- Alternatively, a 5-touch cadence for low-fit leads raises capacity per rep to 7.5 leads a day.
The team can work about 560 leads properly and receives 900, so roughly 340 leads a month get a partial cadence. Before hiring three more SDRs, grade leads and give low-fit ones a shorter, automated cadence; the lead grading calculator helps sort them. For the cost of leads waiting too long, see the lead routing delay cost calculator.
SDR activity and productivity benchmarks (2025)
| Measure | Median or average |
|---|---|
| Total daily activities | 112 (44 phone, 41 email, 19 LinkedIn, 8 text or other) |
| Quality conversations per day | 4.1 |
| Monthly quota, meetings held | 10 |
| Ramp time | 3.0 months |
| Average tenure | 1.9 years |
What is a good SDR utilisation level?
Aim for utilisation in the range where every lead gets its full cadence and SDRs still have slack for spikes:
- Under 70%: spare capacity. Add outbound work or a longer cadence for high-fit leads.
- 70% to 85%: well used with room for busy weeks.
- Above 85%: expect spikes to push leads into partial cadences.
- Above 100%: some leads are not being worked properly. Grade leads, automate low-fit cadences or hire.
The 85% and 100% thresholds match the tool's colour coding; they are planning rules, not published benchmarks.
SDR capacity in India vs the US
Indian inbound teams often run phone and WhatsApp as the main channels, and conversations happen quickly, so minutes per touch can be shorter than for email-led teams. But many leads arrive outside office hours, and the peak can be lunchtime or evening, so plan capacity by hour, not just by day. Language matters too: routing leads to SDRs who speak the lead's language raises the share of quality conversations.
US teams are more often email and phone led, with more research per touch for larger accounts. The Bridge Group data shows a median of about 4 quality conversations a day, so the number of leads an SDR can actually talk to is far below the number they can touch. Pair this calculator with the sales rep ramp calculator, because new SDRs take about three months to reach full capacity.
Common SDR capacity planning mistakes
- Counting all working hours as selling hours. Meetings, training and admin usually take a large share of the day.
- Using total activity counts from a sales engagement tool as quality touches.
- Giving every lead the same cadence regardless of fit.
- Hiring for average monthly volume when leads arrive in spikes after campaigns or events.
- Forgetting ramp: a new SDR hired today adds little capacity for the first months.
Sources
- 2025 SDR Models and Metrics Report, The Bridge Group. Accessed 2026-10-19.
Go deeper
FAQ
It means inbound volume exceeds what your team can work at full cadence, leads are either getting a lighter touch than planned or dropped entirely. The reps-needed output tells you how many additional SDRs would close that gap at the same cadence standard.
Time an experienced rep through a real cadence step, a properly personalized call attempt with notes logged, or a genuinely tailored email, not a templated blast. Eight to ten minutes per touch is a common range for outbound-style touches on inbound leads.
Not automatically, more touches per lead raises the bar for how thoroughly each lead gets worked but directly lowers how many distinct leads a rep can cover in a day, since the two are inversely related in this formula. The right number depends on how much a touch typically moves conversion versus how much unworked inbound volume costs you.
It depends on the lead. High-fit inbound leads usually justify more touches over a longer period than low-fit ones. Test cadence length by measuring at which touch most meetings are booked, and stop adding touches after that point.
It works if inbound leads always come first, because they decay fastest. Teams that mix the two should protect inbound response time with alerts and a rule that inbound is handled before outbound blocks.
Time a sample of real touches for a week, including research and logging, and take the median. Activity timestamps in your sales engagement tool can help, but check them against observation.
Numbers looking off?
If the model says one thing and the pipeline says another, that gap is usually where the revenue is. A 30-minute call finds it.
It starts with a 30-minute call. Pick a time below.