"₹4.5 a minute" is easy to quote and almost impossible to budget from, because nobody buys minutes. You buy qualified leads, screened candidates or confirmed appointments — and the number that matters is what one of those costs.
The arithmetic is not complicated, but it has three terms people routinely leave out.
The formula
Cost per qualified lead = (total minutes billed × rate) ÷ number that qualified.
The trap is that "total minutes" is not "number of leads × call length". Three things sit in between.
1. Connect rate
Not everyone answers. On a cold list, 30–50% is typical; on people who just submitted a form, 60–80%. Unanswered calls bill no minutes, which is the good news — but they also produce no leads, so they change the denominator.
2. Short calls
A meaningful share of connected calls end in fifteen seconds: wrong number, "not interested", someone driving. These bill a little and qualify nobody. In practice they are 10–20% of connects.
3. Qualification rate
Of the people who have a real conversation, some fraction meets your bar. This varies enormously — 10% on a cold list, 50%+ on inbound enquiries — and it is the term with the largest effect on the final number.
Worked example
1,000 inbound leads from a form, called within a few minutes of submitting:
- Connect rate 70% → 700 connected
- 15% end short at ~0.3 min → 105 calls, ~32 minutes
- 595 real conversations at ~4 minutes → 2,380 minutes
- Total ≈ 2,412 minutes × ₹4.5 = ₹10,854
- Qualification rate 35% of real conversations → 208 qualified leads
≈ ₹52 per qualified lead.
Compare against a person doing the same work: 1,000 dial attempts at roughly 13 minutes of real time per lead reached, at ₹300/hour of salaried time, is somewhere north of ₹40,000 — before considering that those hours came out of something else.
The lever that matters most
Not the per-minute rate. Look at the sensitivity:
- Negotiating the rate from ₹4.5 to ₹4 saves about 11%.
- Cutting average call length from 4 minutes to 3 saves about 25%.
- Raising the qualification rate from 35% to 45% cuts cost per lead by 22%.
- Raising the connect rate from 70% to 85% improves it further, and improves everything downstream.
Call length and connect rate are both things you control. Call length is a prompt problem — an agent told to keep replies to one or two sentences finishes the same conversation a minute sooner. Connect rate is a timing problem — calling a form submission within five minutes rather than the next day roughly doubles it.
Both are free. The rate negotiation is the smallest lever and the one people spend the most time on.
Two costs to include for honesty
The number. A dedicated caller ID is ₹500/month. On 208 leads that is ₹2.40 each — immaterial at volume, material if you are running fifty calls a month.
Setup. Writing a good prompt and rating rubric is half a day of someone's time, once. Amortised over the first thousand calls it is negligible; over the first fifty it dominates everything else. This is the real reason low-volume automation does not pay.
Run your own numbers with the estimator on the home page, or see the current plans.