Prorate Calculator Pro

Landlords: stop guessing at prorated rent, late fees, and deposits. 6 calculators with built-in state law guidance for all 50 states + DC. Free to start.

Stop guessing at prorated rent, late fees, and deposit deadlines. Prorate Calculator Pro gives landlords, property managers, and tenants six calculators with built-in state law guidance for all 50 states plus DC — so every number you share is accurate and defensible.

SIX CALCULATORS • Rent Proration — Get the daily rate and prorated amount instantly using Actual Days, Banker's Month, or Annual Rate methods. Compare all three side by side for your apartment, condo, or home. • Affordability — Evaluate tenant income against the 3x Monthly, 40x Annual, and HUD 30% benchmarks. Works both directions. Always free. • Late Fee — Calculate flat or percentage-based fees with state-specific grace periods and fee caps. Know exactly what you can legally charge. • Security Deposit Interest — Compute interest owed on tenant deposits with state and city-level rates. Tracks the return deadline after move-out. • Rent Increase — Check proposed increases against state rent caps with live CPI data for California, Oregon, DC, and more. Flags notice period requirements. • Utility Split — Allocate shared bills across rental units using equal, square footage, occupant, or hybrid methods with per-unit breakdowns.

PROPERTY AND LEASE MANAGEMENT Track your properties, tenants, and leases in one place. See lease status, days remaining, and expiration alerts at a glance. Open any calculator from a lease and inputs auto-populate with the lease data.

SMART ALERTS Automatic notifications for lease expirations at 90, 60, and 30 days. Monthly rent due reminders. Deposit return deadline alerts. Rent increase notice period warnings.

AI-POWERED INSIGHTS On-device intelligence ranks your upcoming lease events by urgency and surfaces plain-language next steps. 100% on-device — no data leaves your phone.

FREE TO START The rent proration and affordability calculators are free with no limits. Upgrade to Premium to unlock all six calculators, property management, iCloud sync, smart alerts, AI insights, widgets, and move-in/move-out photo documentation.

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