Twelve calculators for the operations decisions nobody has a spreadsheet for.
Single-file HTML. No install, no signup, no tracking, MIT licensed. Built while running a $40M P&L across nine countries — these are the models I kept rewriting at every job.
$40M
P&L owned
9
countries operated
12
years in marketplace ops
22
documented cases
Start here
All twelve, by domain
Fraud & chargeback
01
Agent ROI Calculator
Scale, optimize, or investigate a review queue — now with false-positive LTV cost.
BIN Monitoring Detection
Catch BIN-level attack patterns before they reach chargeback.
Chargeback Dispute Wizard
Reason code to action in six questions, evidence package included.
Supply & logistics
03
Surge Simulator (PID)
Tune the zone, not the city.
Logistics Supply Forecaster
Turn a demand forecast into couriers, vehicles, sorters and dock hours.
Driver / Courier Scorecard
Rank couriers without punishing the ones with thin tenure data.
Workforce & queues
05
Workforce Forecast Calculator
How many agents you actually need — in-house vs vendor split.
Queue Operations Command Center
Are we behind on SLA, and what should the agent pick next.
Escalation Decision Calculator
Auto-resolve, wait, route to a human, or page on-call.
Money & leadership
10
Customer Feedback Cost Analyzer
The number you bring when the question is fix-it-now vs absorb-it-forever.
90-Day Operating Plan Generator
Your first ninety days, structured and paste-ready.
Vendor Performance Scorecard
Weighted tiers, sensitivity on the weights, money on the table.