Calculators
The working numbers behind small-business paperwork. Every calculator runs in your browser in exact cents, uses current official rates where rates apply, and links the document generator you will probably want next.
Markup Calculator
Cost and markup percent to selling price and profit, with the margin translation most people get wrong.
Prorated Rent Calculator
Partial-month rent by both methods: actual days in the month and the 30-day banker's month.
Overtime Pay Calculator
The weekly regular/overtime split at time and a half, with state daily-overtime rules included.
Mileage Reimbursement Calculator
Miles to dollars at the 2026 IRS rates, including the July 1 midyear increase.
Per Diem Calculator
Trip totals at GSA FY2026 rates with the 75% first and last day rule applied automatically.
Net 30 Calculator (Invoice Due Date)
Invoice date plus net terms to the exact due date, and days remaining or overdue.
Labor Cost Calculator
An hourly wage loaded into its true cost: payroll taxes, insurance, and benefits per hour.
Billable Hours Calculator
The hourly rate that actually hits your income target, solved from realistic billable hours.
Each calculator links the document generator you will probably want next. Browse all generators → · The rates these run on →