How to calculate transaction (sales) conversion rate
Transaction conversion rate = (transactions ÷ sessions) × 100. If your store had 200 transactions from 10,000 sessions, that’s (200 ÷ 10,000) × 100 = 2%. That’s the core formula — but “transaction,” “sales,” and “payment” conversion rates are measured slightly differently, and mixing them up is why stores get numbers that don’t match their analytics.
The formula, step by step
- Count your transactions (completed orders) over a period.
- Count your sessions (visits) over the same period.
- Divide transactions by sessions.
- Multiply by 100 to get a percentage.
Example: 350 orders ÷ 14,000 sessions = 0.025 → 2.5%.
Sessions vs users vs orders — pick one and stick to it
The formula changes depending on your denominator:
- Session-based (most common): transactions ÷ sessions. One person visiting twice counts as two sessions.
- User-based: transactions ÷ unique visitors. Usually gives a higher rate than session-based.
- Order-based vs unit-based: one order can contain several items — don’t mix orders and units.
Most analytics tools (and most benchmarks) use session-based, so use that unless you have a reason not to. Whatever you choose, keep it consistent or your trend line becomes meaningless.
Transaction vs payment conversion rate
These sound the same but measure different stages:
- Transaction / sales conversion rate = completed orders ÷ sessions. Measures your whole funnel.
- Payment conversion rate = successful payments ÷ payment attempts. Measures just the checkout/payment step — a good way to catch failed cards or a broken gateway.
A healthy transaction rate with a poor payment rate points straight at a checkout problem.
Skip the math — the free conversion rate calculator works out your rate and compares it to your industry average and top performers.
What’s a good number?
Once you have your rate, it only means something in context. The overall ecommerce average is ~2%, but it ranges from ~1% (jewellery) to ~4.5% (food & beverage). See what’s a good ecommerce conversion rate by industry, or if your number looks low, why is my conversion rate low.
The bigger picture
Calculating the rate is step one; finding where buyers drop off is the real work. Revyfix adds every leak — speed, checkout, CTAs, AI visibility — into one score and ranks the fixes by payback.