The customer who messages three shops buys from the one that replies first — not the cheapest, not the best-rated, the first. First response time is the interval between a customer's first message, call or email and your first meaningful reply. It is the single most controllable driver of lead conversion for a small business, and it is usually measured in hours when it should be minutes. This calculator averages your response times across WhatsApp, calls, email and Instagram DMs, shows the median and the worst cases, and compares business-hours performance with after-hours.
The formula
Average first response time = Sum of (first reply time − first message time) ÷ Number of conversations.
Report the median alongside the average — one enquiry left unanswered over a weekend can turn a 12-minute average into 3 hours. Track within business hours separately: a message at 11 pm answered at 9 am is a 10-hour response by the clock but a 0-minute response by your service promise, provided the promise is stated.
How to use the calculator
- Enter response times for the period — paste a list (in minutes), or enter per-channel totals and counts.
- Read the average, median, 90th percentile and the share answered within your target (say 15 minutes).
- Split by channel and by business hours vs after hours.
- Set a target and see how many conversations missed it; those are your lost leads.
- Track weekly; combine with the lead conversion rate to see the effect on sales.
Why minutes matter
Studies of lead response across industries consistently find that replies within five minutes convert many times better than replies after an hour, and that the drop-off continues through the day. For a shop with 40 WhatsApp enquiries a day at 15% conversion, cutting the median response from 45 minutes to 5 can plausibly add 3–5 orders a day. That is worth more than most ad budgets — the CAC calculator will show the equivalent spend.
Getting to a 5-minute median
- WhatsApp Business greeting and away messages — an instant acknowledgement with your hours and a link to the menu or catalogue buys you time without losing the lead.
- Quick replies for the ten most common questions (price, delivery area, timing, GST invoice).
- One person owns the inbox per shift; rotate, but never leave it ownerless.
- Notifications on for the business number; a separate phone for the shop line.
- Calls: miss fewer with a call-back rule — every missed call gets a WhatsApp within 10 minutes.
- After hours: state your hours in the away message; customers accept a next-morning reply if they were told.
- Automation must respect consent rules — see TRAI's new anti-spam rules and WhatsApp Business pricing.
Response time and the other support metrics
Fast replies that do not solve the problem generate repeat contacts — track first contact resolution with it. Satisfaction (CSAT) usually rises with speed until about the 15-minute mark and then plateaus; beyond that, resolution and tone matter more.
Related tools
- Lead conversion rate — where fast replies show up.
- First contact resolution rate — resolve, not just reply.
- CSAT calculator — satisfaction after the interaction.
- WhatsApp direct link — bring enquiries to the channel you answer fastest.
- Sales cycle length — the first stage of the cycle.