15 tools that every cross-border seller needs daily — free, no signup required. Pure formula-driven, no AI calls, free forever.
Categories
| Tool |
Input |
Output |
| Profit Calculator |
Price, cost, shipping, ads, commission |
Profit, margin, risk flags |
| Breakeven Calculator |
Fixed cost, price, variable cost per unit |
Breakeven units & revenue |
| ACoS / ROAS Calculator |
Ad spend, ad-driven sales |
ACoS%, ROAS, target bid |
| Multi-platform commission compare |
Price, category |
Net profit on Amazon / Walmart / Newegg / eBay |
| FX impact on profit |
USD price, CNY cost, current FX, swing |
Profit change, margin change |
| Return-cost impact |
Return rate, AOV, return-handling cost |
Annual loss, margin impact |
| Tool |
Input |
Output |
| Dimensional Weight Calculator |
L×W×H (cm), actual weight (kg) |
Volumetric weight, billable weight, carrier comparison |
| Amazon FBA Size Tier |
Dimensions, weight |
Standard / Large Bulky / Extra-Large tier + fee reference |
| Restock Lead-Time Calculator |
Daily sales, current stock, production lead, sea-freight days, safety stock |
Latest reorder date, projected stockout date |
| Tool |
Input |
Output |
| Listing Character-Limit Checker |
Title, bullets, description |
Char counts vs platform limits, over-limit highlight |
| Keyword Density Analyzer |
Full listing copy |
Top 10 keywords, occurrences, density % |
| Readability Scorer |
Description text |
Word count, avg sentence length, Flesch score, suggestions |
| Tool |
Input |
Output |
| VAT Rate Lookup |
Target country |
Standard rate, reduced rate, registration threshold |
| HS Code Duty Estimator |
HS6 code, country of origin, declared value |
Duty rate range, estimated duty |
| Tool |
Input |
Output |
| Inventory Turnover Calculator |
Monthly sales, on-hand stock, unit cost |
Days of inventory, tied-up capital, industry benchmark |
How to use
- Open the Tools home
- Use the top category tabs or search to find a tool
- Click "Try it" on a tool card — no signup needed
Why it's free
The tools are pure-formula and have no AI compute cost. Niceggie's business model is the AI modules (Customer Service, Pre-sales, Listing, Creator outreach); the tools library is the long-term-free ecosystem on-ramp.
Sample: Profit Calculator
See the example →