build Free Tools

Free Contract Tools

Calculate hidden fees, understand your risks, and know what you're signing before ink meets paper.

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Instant results
No account required
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Private by default
Runs in your browser
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Built for real contracts
Designed around common clauses
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Car Rental Extra Charge Calculator

Find out how much extra you're actually paying beyond the advertised daily rate. Calculates Loss of Use exposure, fuel fees, toll surcharges, insurance upsells, and more.

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Security Deposit Timeline Tracker

Track move-out deadlines, itemized deduction windows, and the exact date your deposit should be returned.

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Late Fee Cap Checker

Enter your rent amount and property details to see if a late fee is likely within legal bounds.

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Rent Increase Cap Estimator

Estimate whether a proposed increase looks reasonable based on common rent cap formulas.

How Our Tools Help You Spot Risk

Each calculator is designed to answer the one question renters and travelers ask too late: “What will this actually cost me?”

Step 1

Enter the numbers you see

Start with the advertised price or lease terms and adjust any defaults to match your contract.

Step 2

See the full cost impact

We break out fees and show how much the fine print changes your total bill.

Step 3

Use the right guide next

Pair tools with the relevant lease or car rental red flag guide to validate clauses.

Use These Tools With Our Guides

Tools FAQ

Are these tools free to use?

Yes. Every calculator and guide is free to access. No signup required.

Do you store the numbers I enter?

No. Calculations run in your browser, and inputs are not saved on our servers.

Why do the defaults look different from my bill?

Defaults are starting points. Replace them with the exact fees quoted in your agreement to get the most accurate estimate.

Will you add more tools?

Yes. We are actively building lease and rental calculators. Check back for new releases.