✦ AI Tool

Calculate Prorated Rent and Generate Addendums

Instantly calculate mid-month rental costs and generate a professional, Word-compatible rent addendum with full Track Changes transparency.

Free — no credit card
Key features

Built for legal-grade output

01 — Daily Rate Precision

Every edit is tracked, every change explained.

Calculate rent based on the exact number of days in the month to ensure fair payment for both landlord and tenant.

The vendor must maintain commercially reasonable security controls. The vendor should try to keep reasonable security practices in place.

Track Changes Transparency

Every adjustment to your rent agreement is visible, ensuring legal trust through clear, documented revisions.

Word-Grade Export

Download your prorated rent addendum as a perfectly formatted DOCX file that opens flawlessly in Microsoft Word.

Instant Legal Drafting

Go from calculation to a complete, annotated contract draft in under 60 seconds without initial signup.

How it works

From prompt to contract in 3 steps

1

Enter Lease Details

Input your monthly rent amount, move-in date, and the total days in the billing cycle.

2

Review the Calculation

Our AI generates the prorated figure and drafts a formal rent addendum with visible Track Changes.

3

Export to Word

Download your document as a high-fidelity DOCX file ready for digital signature or printing.

Use cases

Who uses this

◇

freelancer

Tenants moving into a new studio mid-month who need to document the exact prorated amount for their records.

◇

small-business

Landlords managing commercial or residential units who need to provide clear, professional rent adjustment notices.

◇

legal-team

Property managers requiring standardized, Word-compatible addendums for lease modifications and move-in credits.

About

A prorated rent calculator is a specialized tool used to determine the specific amount of rent owed when a tenant occupies a property for only a portion of a standard billing cycle. This typically occurs during mid-month move-ins or move-outs. Instead of paying a full month's rent, the cost is broken down into a daily rate—calculated by dividing the total monthly rent by the number of days in that specific month—and then multiplied by the days of occupancy. ContractMaker.ai goes beyond simple arithmetic by instantly generating a formal rent addendum or lease amendment. This ensures that both parties have a written record of the adjusted payment, formatted for professional use in Microsoft Word with full Track Changes enabled for total transparency.

FAQ

Frequently asked questions

Is the prorated rent calculator free to use?
Yes, you can calculate your rent and generate a draft addendum for free. We believe in showing value before asking for a signup.
Does the export work with Microsoft Word?
Absolutely. Our documents are engineered for Word-grade fidelity, meaning they maintain perfect formatting when opened in DOCX editors.
How accurate is the AI calculation?
The tool uses standard accounting logic (Daily Rate = Monthly Rent / Days in Month). The AI then drafts the legal language to match these figures.
Do I need an account to start?
No. You can describe your rental situation and see the generated contract in the editor in less than 60 seconds before creating an account.
Are these documents legally binding?
While our tool provides professional templates and precise calculations, we recommend having any final contract reviewed by local legal counsel.

More AI Contract Tools

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Popular Templates

Start from a contract template and customize it inline.

30-DAY NOTICE TO VACATE
DATE: [DATE OF NOTICE]
TO (LANDLORD/PROPERTY MANAGER): [LANDLORD NAME] PROPERTY ADDRESS: [FULL RENTAL PROPERTY ADDRESS]
FROM (TENANT): [TENANT NAME(S)]
1. NOTICE OF INTENT TO VACATE
Please accept this formal written notice that I/we, the undersigned Tenant(s), intend to vacate the premises located at [FULL RENTAL PROPERTY ADDRESS] on or before [LAST DAY OF TENANCY], which is at least thirty (30) days from the date of this notice.
2. LEASE TERMINATION
This notice is provided in accordance with the terms of the Lease Agreement dated [LEASE START DATE] and pursuant to applicable state and local landlord-tenant laws. The tenancy shall conclude at the end of the day on [MOVE-OUT DATE].
3. REASON FOR VACATING
(Optional) [INSERT REASON FOR MOVING, E.G., END OF LEASE TERM, RELOCATION, ETC.]
4. SECURITY DEPOSIT RETURN
I/we request that the security deposit of $[DEPOSIT AMOUNT] be returned in full to the following forwarding address within the timeframe required by law: Forwarding Address: [NEW MAILING ADDRESS]
5. PRE-MOVE OUT INSPECTION
I/we request a joint walk-through inspection of the premises before the move-out d
30 day notice to vacate
AFFIDAVIT
STATE OF [STATE/PROVINCE] COUNTY OF [COUNTY]
1. IDENTIFICATION OF AFFIANT
I, [FULL LEGAL NAME], residing at [FULL ADDRESS], being of legal age and sound mind, do hereby solemnly swear and affirm under penalty of perjury that the following statements are true and correct to the best of my knowledge, information, and belief.
2. PURPOSE OF AFFIDAVIT
This Affidavit is executed for the purpose of [DESCRIBE PURPOSE, E.G., VERIFYING RESIDENCY, DECLARING IDENTITY, OR WITNESSING AN EVENT].
3. STATEMENT OF FACTS
I hereby attest to the following facts and circumstances:
* [FACT 1: Describe the first factual statement in detail.] * [FACT 2: Describe the second factual statement in detail.] * [FACT 3: Describe the third factual statement in detail.] * [FACT 4: Describe the fourth factual statement in detail.]
4. PERSONAL KNOWLEDGE
The facts stated in this Affidavit are within my personal knowledge and are true. I have not omitted any material facts that would make this statement misleading or inaccurate.
5. COMPETENCY
I am competent to testify to the matters stated herein and have full legal capacity to execute
Affidavit Template
SOFTWARE DEVELOPMENT AGREEMENT
EFFECTIVE DATE: [DATE]
This Software Development Agreement (the "Agreement") is entered into by and between:
DEVELOPER: [DEVELOPER NAME], a [STATE] [ENTITY TYPE], located at [ADDRESS] ("Developer").
CLIENT: [CLIENT NAME], a [STATE] [ENTITY TYPE], located at [ADDRESS] ("Client").
1. SERVICES AND SCOPE OF WORK
Developer agrees to perform the development services described in Exhibit A (the "Project"). Any changes to the scope must be agreed upon in writing via a Change Order signed by both parties.
2. COMPENSATION AND PAYMENT
Client shall pay Developer the total sum of $[AMOUNT]. Payments shall be made according to the following milestone schedule:
• [PERCENTAGE]% upon signing as a non-refundable deposit.
• [PERCENTAGE]% upon delivery of [MILESTONE 1].
• [PERCENTAGE]% upon Final Acceptance.
3. INTELLECTUAL PROPERTY RIGHTS
Upon full payment of all fees, Developer hereby assigns to Client all right, title, and interest in the Work Product created specifically for Client under this Agreement. Developer retains ownership of any pre-existing code, libraries, or tools ("Developer Materials") used in the Project, but grants Cli
app development contract

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