Business tools that show the math.
A growing shelf of free, clear-formula calculators for freelancers and small businesses. We show the assumptions and formulas so you can verify the numbers before you act.
The Tool Shelf
Start with a live tool built for a specific business decision—from overdue invoices and cash planning to hiring costs and sales payouts. Each page explains the method and shows you what to do with the result.
Invoices & payments
Manage customer accounts, overdue balances, interest charges, and payment reminders with clear formulas.
- Invoice Late Fee Calculator Available
- Accounts Receivable Aging Tracker Available
Cash flow
Plan runway, burn, and cash timing decisions before you hire, spend, or wait on receivables.
- Cash Runway Calculator Available
Payroll & hiring
Translate salary offers into true employer cost, productive hours, and loaded hourly rates.
- Employee True Cost Calculator Available
Sales & commissions
Model rep payouts, draws, bonuses, quotas, splits, and tiered commission plans.
- Sales Commission Calculator Available
Built for the next decision
Useful answers need context. These tools keep the assumptions visible, explain the method, and help you move from a business question to a practical next step.
01 Inputs with context
Plain-language labels and guidance make it clear what each number means before you enter it.
02 Assumptions in view
Rates, dates, rounding choices, and planning limits stay visible instead of hiding behind a result.
03 Results you can inspect
See the underlying method and the important lines that move the answer, not just a black-box number.
04 Ready for action
Use the result in a pricing, hiring, cash-flow, invoice, or sales decision with fewer assumptions left unstated.