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Sell-Through by Week Calculator

Track weekly sell-through rate on a buy — units sold versus units received — and project the weeks to clear the remaining stock at the current pace.

Units received (the buy)

Units sold so far

Weeks on sale so far

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How it works

Sell-through % = units sold ÷ units received × 100 · Weekly rate = sell-through % ÷ weeks · Weeks to clear = units remaining ÷ (units sold ÷ weeks)

Sell-through measures how much of a specific buy has actually sold, and doing it by week turns a static snapshot into a pace. Dividing units sold by units received gives the percentage gone; dividing that by weeks elapsed gives a weekly velocity you can compare against plan and use to project when the remaining stock will clear. A healthy fashion buy often targets 60–70% sell-through over 8–12 weeks at full price; a rate far below that flags an early markdown, while one far above it flags a missed reorder.

Worked example

A 500-unit buy has sold 180 units in 3 weeks — a 36% sell-through, or 12% per week, at 60 units a week. With 320 units left, at that pace it will take 320 ÷ 60 ≈ 5.3 more weeks to clear, keeping the whole run inside a healthy sub-9-week window.

Frequently asked questions

What is a good weekly sell-through rate?

It varies by category and price point, but many apparel buyers look for roughly 5–8% a week to reach 60–70% by the end of a full-price window. Basics can run slower and still be fine; fast fashion expects more. Compare to your own history and plan.

How is this different from a plain sell-through rate?

A plain sell-through rate is the cumulative percentage to date. Doing it by week adds velocity and a projection — how fast stock is moving and when it will run out — which is what actually drives markdown timing and reorder decisions.

When should low sell-through trigger a markdown?

When the projected weeks-to-clear runs past the season or the point where the goods lose relevance. If this calculator shows you will still be sitting on units after your selling window closes, an earlier, shallower markdown usually beats a late, deep one.

Related calculators

Retail Markdown Cadence Calculator

Plan a staged retail markdown cadence — successive percent-off steps from full price to clearance — and see the final price, cumulative discount and margin at each stage.

Open-to-Buy Budget Calculator

Calculate open-to-buy — the merchandise dollars a retail buyer still has left to order this period after planned sales, markdowns and stock targets.

Sell-Through Rate Calculator

See what share of received stock actually sold in a period — sell-through rate, units remaining and days of inventory left at the current pace.

Inventory Turnover Calculator

Calculate inventory turnover from COGS and average inventory, plus days inventory outstanding — how many days of stock you hold.

Educational estimate, not financial advice.