What is a free shipping threshold
A free shipping threshold is the order value a customer must reach to unlock free shipping. It solves the single biggest driver of cart abandonment — unexpected shipping costs — and simultaneously encourages shoppers to add another item to qualify. Set it well and you lift average order value without hurting margin; set it wrong and you give away shipping you can't afford.
How to set the right threshold (the margin-safe rule)
A customer who bumps their basket up to your threshold adds (threshold − AOV) in spend, which generates margin × (threshold − AOV) in extra profit. To stay safe, that extra profit must at least cover the shipping you now absorb:
Margin-safe floor = AOV + (shipping cost ÷ contribution margin)
Never set your threshold below that floor. Then make sure it's at least 15% above your AOV so it actually changes behavior — the calculator takes the higher of the two and rounds to a clean, appealing number.
Why thresholds raise average order value
The nudge is pure psychology: when shoppers are a few dollars short of free shipping, adding one more item feels smarter than paying to ship. A visible progress bar amplifies it. Across ecommerce, stores that introduce a free-shipping threshold typically report a 12–20% increase in average order value — which is why the default lift assumption here is a conservative 12%.
When free shipping actually costs you money
Free shipping isn't free — you absorb it on every qualifying order. If your margin is thin or your shipping cost is high, the math can flip negative: the shipping you eat outweighs the extra margin from bigger baskets. This tool models that explicitly, showing your net monthly profit impact and warning you when a profit-safe threshold would sit so high that hardly anyone qualifies. In those cases, flat-rate shipping or pricing shipping into the product is often the better move.
Frequently asked questions
- What is a free shipping threshold?
- A free shipping threshold is the minimum order value a customer must reach to qualify for free shipping (for example, 'Free shipping on orders over $75'). It removes the #1 cause of cart abandonment — surprise shipping costs at checkout — while nudging shoppers to add another item to qualify.
- How do I set the right free shipping threshold?
- Use the margin-safe rule. The extra spend a customer adds to reach the threshold must generate at least as much margin as the shipping you'll now absorb. That floor equals AOV + (shipping cost ÷ contribution margin). Set your threshold at or above that floor — and at least 15% above your AOV so it actually nudges behavior.
- Why do free shipping thresholds raise average order value?
- When a customer is a few dollars short of free shipping, adding one more item usually feels cheaper than paying for shipping. That psychology reliably increases basket sizes — stores running a progress bar ('You're $12 away from free shipping!') commonly see a 12–20% lift in average order value.
- When does free shipping actually cost me money?
- When the shipping you absorb on qualifying orders outruns the extra margin those bigger baskets create. This happens when your margin is thin, your shipping cost is high, or your threshold is set too low. This calculator enforces a profit floor so it never recommends a threshold that quietly loses money.
- Should I offer free shipping at all?
- If your shipping cost is high relative to your margin, a profit-safe threshold may sit so far above your AOV that few customers qualify. In that case, flat-rate shipping or building shipping into your product price can be healthier than a free-shipping bar. The calculator flags this situation for you.
- Is this calculator free?
- Yes — free forever, no signup, no email. Every calculation runs entirely in your browser, so your numbers never leave your device.
Want help wiring this into your store?
Get in touchEstimates based on the numbers and assumptions you enter — not financial advice. Test against your own store data.