Free business & legal calculators.
Rent, loans, pay, and ownership — instant answers, no signup.
All business and legal calculators
Prorated Rent
Move in on the 14th? Get the exact partial-month rent, by daily or banker’s method.
Late Rent Fee
Flat fee, percentage, or daily — what a late payment actually adds up to.
Rent to Income
Screen applicants with the 30% rule and 3× rent standards in seconds.
Lease Dates
Termination, renewal, and notice-to-vacate dates from any lease term.
Lease Break Cost
What ending a lease early really costs, with re-rental credits counted.
Loan Payment & Amortization
Monthly payment plus the full payment-by-payment schedule for any loan.
Simple & Compound Interest
What a balance grows to — or costs — under either interest method.
Loan Payoff
When you’ll be debt-free, and what extra payments save you.
Salary ↔ Hourly
Convert pay both directions with real work-year assumptions you control.
Overtime Pay
Time-and-a-half math done right, including blended rates.
PTO Payout
What unused vacation is worth when someone leaves.
Equity & Partner Split
Fair ownership percentages from contributions, cash, and sweat.
Invoice Late Fee
Late fees and interest on unpaid invoices — and what to put in the demand letter.
Contract Dates
Terms, renewals, deadlines, and business days from any start date.
You’ve got the number.
Now make it official.
Every calculator above pairs with a BizDocs document — the lease, note, invoice, or agreement that puts your number in writing. Create it in minutes.