Free Legal Calculators & Tools
Free legal calculators and tools can help you estimate amounts, check dates, organize information, and prepare for common legal tasks. Know Your State Law offers 11 tools covering rent and security deposits, eviction notices, pay, small claims court, and power of attorney requirements.
These tools perform calculations from the information you enter. They do not decide whether money is legally owed, whether a deduction is allowed, or whether you can bring a particular claim.
Find the Right Legal Tool
Choose a tool based on the question you are trying to answer. Each link below takes you directly to the calculator or guide.
Rent and Security Deposits
Security Deposit Refund Calculator
Estimate the remaining deposit after listed deductions and refunds.
Security Deposit Deadline Checker
Check a potential return or notice date for the states covered by the tool.
Late Rent Fee Calculator
Calculate a fee using rent and a percentage you enter.
Rent Increase Calculator
Compare current and proposed rent, including the dollar and percentage change.
Eviction and Notice Dates
Eviction Notice Deadline Calculator
Count calendar days from a period you enter; confirm the actual legal deadline separately.
Eviction Notice Draft Builder
Organize key facts into a draft worksheet before checking your state’s notice rules.
Work and Pay
Overtime Pay Calculator
Estimate gross pay from your hourly rate, regular hours, overtime hours, and multiplier.
Unpaid Wages Calculator
Estimate a basic pay difference from hours, rate, and the amount already paid.
Small Claims Court
Small Claims Court Amount Checker
Total the amount you are considering claiming, then verify the court’s limit and exclusions.
Small Claims Court Filing Guide
Prepare a checklist of information and steps to verify before filing.
Power of Attorney
Power of Attorney Requirements Checker
Build a checklist of state-specific requirements to confirm before signing.
Quick tip: If you are unsure where to start, choose the tool closest to your situation, then read the related state-law guide and confirm important details with an official source.
Overtime Pay Calculator
Enter your hourly rate, regular hours, overtime hours, and overtime multiplier. The default multiplier is 1.5. This is a mathematical estimate only; overtime rules and exemptions vary by jurisdiction and worker classification.
For related information, explore our employment and workplace law guides.
Unpaid Wages Calculator
Enter hours worked, hourly rate, and amount already paid. The result estimates the difference. It does not calculate overtime premiums, tips, commissions, penalties, interest, deductions, or other wage-law remedies.
Security Deposit Refund Calculator
Use our dedicated Security Deposit Refund Calculator to estimate the remaining balance after listed deductions and any amount already returned. It does not determine whether a deduction is lawful or what deadline applies.
For state-specific rules, see our security deposit law guides.
Rent Increase Calculator
Use our dedicated Rent Increase Calculator to compare current and proposed rent, percentage change, and estimated cost over time. The result does not establish whether an increase is lawful.
Small Claims Court Amount Checker
Use the Small Claims Court Amount Checker to total the amounts you may claim. Then compare the correct figure with the official limit and exclusions for your specific court.
How to Use These Legal Calculators
- Enter accurate numbers and check your inputs.
- Treat the result as a preliminary estimate.
- Identify the state, court, employment classification, lease, or contract rules that apply.
- Confirm deadlines, limits, eligibility requirements, and remedies with official sources.
- Consider qualified legal advice when the issue involves substantial money, eviction, job loss, court deadlines, or other serious consequences.
How the Tools Work
Each legal calculator uses the numbers you enter. The tools do not automatically determine the law, check every state statute, interpret a contract, decide employment classification, or establish court jurisdiction.
| Tool | What it helps with | What it does not decide |
|---|---|---|
| Security Deposit Refund Calculator | Estimate the remaining balance after listed deductions and refunds | Whether deductions are lawful or a deadline was missed |
| Security Deposit Deadline Checker | Check a potential return or notice date for covered states | The exact legal deadline in every situation |
| Late Rent Fee Calculator | Calculate a fee from rent and a percentage you enter | Whether the fee is allowed by law or lease |
| Rent Increase Calculator | Compare current and proposed rent | Whether the increase is legally permitted |
| Eviction Notice Deadline Calculator | Count calendar days using a period you enter | The legally required notice period or final deadline |
| Eviction Notice Draft Builder | Organize information into a draft worksheet | Whether the notice wording, service, or timing complies with law |
| Overtime Pay Calculator | Estimate gross pay from hours and rate | Whether you qualify for overtime or are owed that amount |
| Unpaid Wages Calculator | Estimate a basic straight-time pay difference | Overtime premiums, penalties, interest, or legal entitlement |
| Small Claims Court Amount Checker | Total the amount you are considering claiming | Court jurisdiction, claim eligibility, or recoverability |
| Small Claims Court Filing Guide | Prepare a filing checklist | Whether your claim meets local court rules or deadlines |
| Power of Attorney Requirements Checker | Build a checklist of state requirements to verify | Whether a document is valid or suitable for your circumstances |
Frequently Asked Questions
Are these legal calculators official government tools?
No. They are informational tools from Know Your State Law. Verify important results with the applicable government or court source.
Do state laws affect the results?
Yes. The math may be simple, but the legal meaning of the result can vary by state, local jurisdiction, facts, and date.
Will a calculator prove that money is owed?
No. A calculation cannot verify the legal facts needed to establish a claim.
Related Legal Resources
After using a tool, browse State Laws for state-specific information or explore Legal Topics to research the subject. Read our Legal Disclaimer before relying on general information.
Disclaimer: Know Your State Law provides general legal information for educational purposes. Laws and procedures can change. Verify important information with current official sources or a qualified attorney.