3 Free TikTok Shop Calculators: FBT vs. Seller Shipping, Live‑Sale Capacity, and Inventory Sync Risk

All tools run in your browser—no data leaves this page.

Scaling on TikTok Shop is exhilarating—until operations bog down your day. These three calculators help you make faster decisions about fulfillment, live‑sale staffing, and inventory sync. Edit any number to match your workflow and get instant answers.

On this page

FBT vs. Seller Shipping — Total Cost

What it does: Compares per‑order and monthly costs for TikTok’s Fulfilled‑by‑TikTok (FBT) vs. self‑fulfillment (Seller Shipping).
Use it to: Decide when to remain self‑fulfilled, when to move SKUs to FBT, or when to run a hybrid mix.

How to read it

• Seller cost / order vs FBT cost / order
• Monthly totals and Monthly savings
• A Recommendation with the per‑order cost delta

Live‑Sale Surge Capacity Planner

What it does: Estimates staffing and time‑to‑ship for your next live event.
Use it to: Check whether you’ll hit your ship‑by SLA and see staff needed with and without automation.

Live‑Sale Surge Capacity Planner

Estimate staffing and time‑to‑ship for your next live event. Compare manual vs. automated workflows.

Expected orders (event)

Live duration (hours)

Staff on shift

Packages/hour per person (manual)

Automation multiplier (×)

Ship‑by SLA (hours from event start)

Orders/hour (inflow)

—

Even spread across the live window

Manual capacity/hour

—

= staff × manual pph

Automated capacity/hour

—

= manual capacity × automation multiplier

Time to ship all (manual)

—

—

Time to ship all (automated)

—

—

Required staff to meet SLA

— (manual) • — (automated)

Assumes your pph and automation multiplier above

Copy settings link Reset

How to read it

• Orders/hour (inflow) during the live
• Capacity/hour (manual and automated)
• Time to ship all and whether you’ll meet SLA
• Required staff to meet SLA (manual vs. automated)

Inventory Sync Risk (Oversell) Estimator

What it does: Estimates oversell risk caused by inventory drift between syncs.
Use it to: Choose between faster syncs or raising safety stock per SKU.

Inventory Sync Risk (Oversell) Estimator

Estimate oversell risk from inventory drift between syncs, plus concrete fixes (faster syncs or more safety stock).

Currency

# SKUs sold on TikTok

Median stock per SKU (units)

TikTok sales per SKU per day

Other‑channel sales per SKU per day

Sync frequency (hours)

Safety stock per SKU (units)

Penalty / lost GMV per oversell (per order)

Expected drift per sync (per SKU)

—

= (TikTok + other) × (sync hours / 24)

Potential oversells / month (all SKUs)

—

Assumes one unit/order

Monthly risk (estimated)

—

Risk score

—

—

Recommended sync cadence

—

To keep drift ≤ safety stock

Or raise safety stock to

—

If cadence can’t change

Copy settings link Reset

How to read it

• Expected drift per sync (per SKU)
• Potential oversells / month and Monthly risk ($)
• A Risk score and recommended sync cadence (or safety stock)

Notes & assumptions

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

What to do next

• If FBT and Seller are close on cost, try a hybrid: fast movers in FBT, long‑tail self‑fulfilled.
• If live events push you over SLA, raise staffing or increase your automation multiplier (batch labels, picklists, carrier rules).
• If oversell risk is high, either sync more frequently or raise safety stock on SKUs with spiky demand.

FAQ

Do these calculators send my data anywhere?
No. Everything runs entirely in your browser.

How accurate are the defaults?
They’re conservative baselines. Adjust inputs to reflect your operation—the results update instantly.

Can I share my scenario?
Yes. Use the Copy settings link button on any calculator to save or share your inputs and outputs.