TOOL 05 / CALCULATE

Trade-up calculator.

Enter contract collection shares, current candidate counts and normalized input floats to model per-item odds and output float. No item prices or profit claims.

Contract inputs

MATH ONLY · NO PRICES

Input rarity

All inputs are StatTrakAt least one input is Souvenir

StatTrak and Souvenir cannot be selected together. Valve’s special five-item Covert rule has separate output rules; check the live contract screen before using items.

Normalized float for each input (0–1, 10 values)

Enter each input’s normalized float: (item float − that skin’s minimum) ÷ (that skin’s maximum − minimum). The calculator averages these normalized values before mapping them to each target skin’s wear range.

Collection shares and target item

0 / 10 input items assigned

Collection group 1Collection / case nameTarget skin to model

Inputs from hereEligible next-tier outcomesTarget skin min floatTarget skin max float

Collection group 2Collection / case nameTarget skin to model

Inputs from hereEligible next-tier outcomesTarget skin min floatTarget skin max float

Collection group 3Collection / case nameTarget skin to model

Inputs from hereEligible next-tier outcomesTarget skin min floatTarget skin max float

CALCULATION

Possible outcomes

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Enter exactly 10 normalized floats from 0 to 1. Assign exactly 10 valid whole-number inputs across collections, with an eligible outcome count and target float range for each active row.

Rules and limits: Standard contracts use 10 items of the same eligible rarity (Industrial through Covert); the special Covert option uses 5 Covert items. Valve’s October 22, 2025 update says five regular Covert items can return a regular knife or gloves, while five StatTrak Covert items return a StatTrak knife. Since May 22, 2026, Souvenir inputs may be used alongside normal items; Souvenir attributes are removed and the output is normal quality. This tool requires you to supply current eligible-outcome counts and does not model collections, prices, wear availability, or expected value automatically. Valve: 5-Covert contracts ↗ · Valve: Souvenir contracts ↗ · Community data cross-check ↗