Calculators and spreadsheets that show their math
Free browser tools and matching Excel and Google Sheets templates for owner-operator truckers and network engineers. Every formula is visible, versioned and checked.
For owner-operator truckers
Fuel tax, cost per mile, per diem, driver pay and bookkeeping, worked out the same way every quarter.
For network engineers and homelab builders
Subnetting, PoE and power budgets, UPS runtime, cabling and documentation, planned before the rack is built.
How the math is checked
39hand-worked test cases pass for the 8 calculators
16spreadsheet templates recalculated with 0 formula errors
32,477formulas in those workbooks, all visible and unlocked
v1.0every template shows its version and file date
Drafted with AI assistance, then checked against worked examples and automated tests. No external audit is claimed. Read the method.
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Templates
Driver Pay Settlement Sheet for Small FleetsA weekly driver pay settlement workbook for small fleet owners that calculates per mile and percentage pay and$15
Hot Shot Trucking Profit Planner and Break-Even Rate CalculatorA hot-shot trucking planner that helps you check, in about two minutes, whether a load rate covers deadhead, f$14
Owner Operator Bookkeeping Workbook with IFTA and Cost Per MileAn all-in-one Excel bookkeeping workbook for owner-operators who run their own authority. Log loads, fuel, mil$28
Backup 3-2-1 Plan Worksheet for Home LabsCheck each dataset against 3-2-1, your recovery targets and your real restore and upload speeds. What you get:$12
Docker Service Inventory and Port Map TrackerOne sheet for every service, host, port and backup flag. Finds duplicate ports before a container fails to sta$12
Home Lab Bill of Materials and Cost Tracker SpreadsheetTrack every purchase, tax and shipping, budget vs spend by category and status, and 3-year cost of ownership. $12
Guides
- GuideWhat is the 3-2-1 backup rule and how do I apply it to a homelab?The 3-2-1 backup rule means keeping three copies of your data, on two different types of storage, with one copy stored offsite.
- GuideHow do I work out my real cost per mile as an owner operator?Your real cost per mile is your total operating costs for a period divided by the total miles you drove in that period, including empty miles.
- GuideHow do I subnet a home or small office network?Subnetting means cutting one block of IP addresses into smaller blocks, each one a separate network.