Single-purpose calculators and checks for tradespeople, operators and small-business owners. Each one does exactly one job and does it honestly.
Claims vs Evidence Verifier →
Test delivery, liveness, credential, config and external-receipt claims against fresh evidence at the layer each claim describes; export a portable JSON receipt.
Job Profitability & Break-Even Calculator →
Find your true break-even billable rate from labor burden, overhead and crew utilization, then price any job to a real net margin.
Scope-Creep & Change Order Cost Calculator →
Add up the hidden admin, schedule-delay and overhead costs buried in a construction change order so you charge the true price.
Service Call Minimum & Trip Charge Calculator →
Turn burdened crew rate, drive time, dispatch, and truck cost into a true diagnostic / trip-charge floor that still leaves net margin.
RFP Bid Go / No-Go Scorer →
Score fit and risk, then check whether the expected value of bidding covers estimate cost and opportunity cost before you chase an RFP.
Late Invoice Interest & Carrying Cost Calculator →
Turn unpaid principal, contract annual rate, and days past due into accrued interest, daily carrying cost, and a total-to-request figure for the follow-up.
Cold Email Deliverability Preflight →
Check your SPF, DKIM and DMARC records and lint your outbound copy for spam triggers before you hit send.
Get a free job-profit review from Corbelworks
Tell us your trade and what's costing you — we'll look at the numbers and reply within 1 business day. No pitch, no commitment.