Negotiation Range Calculator: Offer Floor and Counter Script
Calculate a resale offer floor, target close price, live accept/counter/decline decision, and editable buyer response script from costs, fee basis, urgency, and ROI.
What this tool helps you do
Calculate a cost-and-ROI price floor, target close price, live accept/counter/decline decision, and editable buyer response script with optional fee-basis add-on before replying to an offer.
Interactive inputs and calculations load after the app boots. Use this prerendered preview to understand what the tool covers before opening the live experience.
Best for
- negotiation calculator
- price floor calculator
- counter offer script
- offer response strategy
- haggling calculator
Calculate a defendable price floor before you answer an offer
The calculator separates the number you cannot cross from the number you would like to close at. Your absolute floor is based on item cost, seller-paid shipping, packing or promotion costs, the estimated transaction fee, an optional fee-basis add-on, and the minimum return you require on the full invested amount.
Platform presets are dated US estimates, not universal promises. eBay, Poshmark, Mercari, and Depop all have different fee bases and exceptions, so the fee field and fee-basis add-on stay editable when a current official page or payout statement shows a different effective rate.
The live offer input applies the same math to the buyer number in front of you. It returns accept, counter, or decline, shows expected profit and ROI, suggests a counter when appropriate, and writes a neutral script that avoids unsupported comp or authenticity claims.
- Floor formula: invested costs plus required profit plus estimated transaction fees, with buyer-paid amounts added only to the fee basis when needed.
- Strategy inputs: listing age, urgency, and real buyer interest.
- Decision zones: decline below floor, counter below target, accept at or above target.
- Safety rule: time pressure can lower the target, never the mathematical floor.
Official fee sources checked August 8, 2026
eBay selling fees
Official fee rules, category differences, per-order charges, and seller-specific exceptions.
Poshmark seller fees
Official US flat-fee threshold and percentage fee policy.
Mercari selling fees
Official US seller-fee basis and current transaction rules.
Depop seller fees
Official US selling-fee and payment-processing guidance.
Frequently Asked Questions
How does a negotiation range calculator work for resale offers?
It separates two decisions that sellers often mix together. The floor is mathematical: item cost, seller-paid shipping, packing or promotion costs, estimated transaction fees, and required ROI. The target close price is strategic: asking price, listing age, urgency, and current buyer interest.
What should my price floor include?
Include every cost that still belongs to you after the sale: acquisition cost, seller-paid postage, packing materials, authentication or cleaning, promoted-listing cost when applicable, and the platform fee. If the platform charges the seller fee on buyer-paid shipping, tax, or handling, put that amount in the fee-basis add-on instead of counting it as a seller cost. Apply the ROI target to the full invested amount.
Should I counter or decline an offer below my floor?
If the offer cannot cover your costs and minimum return, decline it or state the lowest workable price. Counter only when there is a realistic path above the floor. Avoid claiming that sold comps support your number unless you actually checked the same model, condition, date range, and shipping terms.
What does the live offer decision add?
The live offer input checks the actual buyer number against the cost-and-ROI floor and the target close price. It returns accept, counter, or decline, shows expected profit and ROI, suggests a counter when appropriate, and writes a neutral script.
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