Auction Bid Calculator

Work out the true cost of auction lots on BidSpotter & i-bidder, plus eBay and Amazon resale fees and profit.

The hammer price is only half the story. Commission, VAT and fees quietly add 20–30% to every auction win — and most bidders only find out after they've won. Auction Bid Calculator is a sidebar that opens right on the lot page and shows your all-in cost before you bid, plus what the lot is really worth if you resell it on eBay or Amazon. 🔨 TRUE AUCTION COST — FREE, UNLIMITED • Hammer price + commission + VAT + per-unit maths, computed live as you type • Commission % read automatically from BidSpotter and i-bidder lot pages • Know your walk-away number before bidding opens 🏷️ EBAY FEE & PROFIT ENGINE — FREE, UNLIMITED • The full UK fee table: tiered final value fees by category, fixed order fees, regulatory fee, seller levels, international rates • Private and business seller modes, VAT-registered or not • Break-even analysis and 10/20/30/50% profit targets • Fee rates update from our servers — always current, no extension update needed 📦 AMAZON RESALE CHECK — 10 FREE/MONTH, UNLIMITED ON PRO • Type an ASIN, get live FBA fees, referral rates and the 30-day average Buy Box price • Instant net-profit and ROI verdict on flipping the lot to Amazon • Free account includes 10 checks a month; Pro (£4.99/mo or £49/yr) is unlimited WORKS ON bidspotter.co.uk · bidspotter.com · i-bidder.com HONEST PRICING The auction and eBay calculators run entirely in your browser — free forever, no account needed. Amazon checks use live market data that costs us money per lookup, which is why those are metered. No ads, no data selling, no dark patterns — cancel Pro in two clicks. PRIVACY, PLAINLY Your calculations and history stay on your device. If you sign in we store your email and a monthly lookup count — nothing else. Payments are handled by Stripe; we never see card details. Full policy: https://bidcalculator.co.uk/privacy/ Auction Bid Calculator is an independent tool and is not affiliated with Auction Technology Group, BidSpotter, i-bidder, eBay or Amazon. All calculations are estimates for guidance only. ``` Category: Shopping Language: English (United Kingdom)