Amazon FBA Calculator & Seller Tools – Free Profit, BSR & Fee Analyzer

AMZ Prep Insights — The Most Comprehensive FREE Amazon Seller Chrome Extension Stop paying $39–$99/month for tools that give you half the picture. AMZ Prep Insights is a completely free Amazon FBA calculator and product research suite with 18+ built-in seller tools, updated 2026 fee rates, and real-time analytics across 20+ Amazon marketplaces. Trusted by 50,000+ Amazon sellers worldwide. Built by AMZ Prep — North America's largest FBA prep and 3PL fulfillment provider with 50+ warehouse locations, 280+ logistics specialists, and millions of units shipped monthly. We don't just build seller tools — we live and breathe Amazon logistics every single day. This extension is powered by the same data and expertise that brands like Duracell, Unilever, GNC, Thrasio, and Eight Sleep trust to scale their Amazon operations. ADVANCED FBA FEE CALCULATOR — UPDATED WITH 2026 RATES The most accurate free Amazon FBA fee calculator available. Period. Updated within 24 hours of every Amazon fee announcement. - Real-time FBA fee calculation with official 2026 rate structure (referral fees, fulfillment fees, monthly and long-term storage fees) - FBA vs. FBM side-by-side cost comparison — see exactly which fulfillment method maximizes your margin - Dynamic profit projections with adjustable cost of goods sold (COGS), shipping costs, and prep expenses - ROI and profit margin calculator — instant net profit, profit margin percentage, and return on investment - Category-specific referral fee analysis across all Amazon categories (8% electronics, 15% standard, 17% apparel, and more) - Seasonal fee adjustments — automatically accounts for Q4 peak storage surcharges (Oct 15 – Jan 14) - Low-inventory-level fee tracking with alerts to avoid Amazon's penalty charges - Aged inventory surcharge calculator — model the cost impact of slow-moving stock - Multi-tier storage fee calculations — standard, oversize, dangerous goods, and climate-controlled - Dimensional weight calculator — automatically compares actual weight vs. dim weight and uses the higher value, exactly like Amazon - Size tier classification — instantly determines if your product is Small Standard, Large Standard, Large Bulky, or Extra-Large - Prep service cost breakdown — factor in poly bagging, labeling, bundling, and kitting costs - Break-even analysis — know exactly how many units you need to sell to cover all costs - Monthly cash flow forecasting — project revenue, expenses, and profit across a 12-month timeline Whether you call it an Amazon FBA revenue calculator, Amazon fee calculator, FBA profit calculator, or Amazon seller calculator — this tool handles it all. For even deeper analysis, visit our full web-based calculator: https://amzprep.com/amazon-fba-profit-margin-calculator/ REAL-TIME BSR TRACKING & SALES ESTIMATION Know exactly how a product is performing before you commit a single dollar. - Real-time Best Sellers Rank (BSR) monitoring on any Amazon product page - Estimated daily and monthly sales volume powered by BSR-to-sales algorithms calibrated with real seller data - BSR trend analysis — spot products gaining momentum or losing steam before your competitors do - Category and sub-category BSR tracking — understand where a product ranks within its niche, not just the overall store - Revenue estimation — multiply projected sales by your selling price for instant gross revenue calculations - Historical BSR pattern recognition — identify seasonal products, trending items, and declining categories - BSR percentile indicators — instantly see if a product is in the top 1%, 5%, or 10% of its category For standalone BSR analysis across 9 marketplaces and 18+ categories, try our dedicated tool: https://amzprep.com/amazon-bsr-sales-estimator/ PRODUCT RESEARCH & COMPETITION ANALYSIS Go beyond surface-level data. Understand the competitive landscape before you enter any market. - Competition level indicators — instantly gauge how saturated a niche is - Seller count analysis — see how many sellers are competing for the Buy Box - Buy Box tracking — understand who holds the Buy Box, their pricing strategy, and fulfillment method - Review velocity and rating breakdown — evaluate product quality and customer sentiment at a glance - Product dimension and weight verification — ensure accurate fee calculations before you source - Price positioning intelligence — see where your target price sits relative to the competition - Market saturation indicators — identify whether a category has room for new entrants - ASIN details, category paths, and listing quality signals - Competitive advantage identification — spot gaps in the market that existing sellers are missing - Top competitor tracking — monitor the top 10 sellers in any product niche DYNAMIC PROFIT & ROI CALCULATOR Model your entire business case before you invest. - Monthly revenue projections with adjustable assumptions - Initial investment planning — factor in product cost, shipping, prep, and advertising spend - Inventory level optimization — calculate the ideal stock quantity based on sales velocity and lead time - Growth rate modeling — project how scaling volume impacts your per-unit economics - Seasonal profit adjustment — model Q4 spikes, Prime Day lifts, and off-season dips - Complete ROI timeline estimation — see your payback period and long-term profitability - Cash flow forecasting — month-by-month breakdown of when money comes in and goes out 20+ AMAZON MARKETPLACE SUPPORT The widest marketplace coverage of any free Amazon seller Chrome extension: USA (.com) | UK (.co.uk) | Canada (.ca) | Germany (.de) | France (.fr) | Italy (.it) | Spain (.es) | Japan (.co.jp) | Australia (.com.au) | India (.in) | Mexico (.com.mx) | Brazil (.com.br) | Netherlands (.nl) | Sweden (.se) | Poland (.pl) | Singapore (.sg) | UAE (.ae) | Saudi Arabia (.sa) | Egypt (.eg) | Turkey (.tr) Every marketplace uses its own fee structure, referral rates, and currency. Our calculator handles all of them a…