Scaling on TikTok Shop is exhilarating—until the operations drag you down. The right decisions on fulfillment, staffing for live events, and inventory sync determine whether you ship on time or scramble for days.

Below are three free, in‑browser calculators:

• FBT vs. Seller Shipping Cost (find the cheaper path for your catalog),
• Live‑Sale Surge Capacity Planner (know how many people you need), and
• Inventory Sync Risk Estimator (see oversell risk and what to change).

Nothing you enter leaves your browser. Tweak the defaults to match your workflow.

1) FBT vs. Seller Shipping Total Cost Calculator

How to read it: You’ll see cost per order and monthly totals for both paths, plus a recommendation and savings estimate. Use it to decide when to keep self‑fulfilling, when to move SKUs to FBT, or when to do a hybrid mix.

2) Live‑Sale Surge Capacity Planner

How to read it: Enter your expected orders and live duration. You’ll get required staff for manual vs. automated workflows, time to clear the queue, and whether you’ll make your SLA (e.g., ship within 24 hours).

3) Inventory Sync Risk (Oversell) Estimator

How to read it: The tool models inventory drift between syncs to estimate potential oversells per month, a risk score, and concrete fixes (e.g., “sync every 3 hours” or “add 4 units of safety stock”).

Notes & assumptions

• These are directional planning tools—adjust defaults to your reality.
• Calculators exclude carrier surcharges, TikTok incentives, and complex storage tiers for clarity.
• For mixed catalogs, run the FBT vs Seller tool per product group (fast movers vs slow movers, bulky vs light).

What to do next

• If the FBT vs Seller delta is small, test a hybrid: fast movers in FBT, long‑tail via Seller Shipping.
• If live capacity is your bottleneck, standardize a picking wave and use batch labels right after the 1‑hour hold.
• If inventory risk is high, either sync more frequently or raise safety stock on SKUs with uneven demand.