# Mr. Know-It-All
> Your Hand of Calculators & Reference Info

Base URL: https://mrknowitall.net

Mr. Know-It-All is a network of free reference tools and calculators. The parent hub at mrknowitall.net links to all sub-sites. All tools are free and require no sign-up.

## Network sites

### Concrete Knowhow
URL: https://concrete.mrknowitall.net
Description: Free construction material calculators for DIYers and professionals. Results include both volume and unit counts (bags, rolls, pallets) to simplify purchasing.
Tools:
- Concrete Calculator — cubic yards and bag count (60 lb / 80 lb) for slabs, footings, and columns
- Gravel Calculator — cubic yards and tons for driveways, paths, and drainage
- Mulch Calculator — cubic yards and 2 cu ft / 3 cu ft bag counts
- Topsoil Calculator — cubic yards with settling allowance
- Sand Calculator — cubic yards and tons for leveling and fill
- Sod Calculator — rolls and pallets for any lawn area

### Tenant Knowhow
URL: https://tenant.mrknowitall.net
Description: Plain-English tenant rights resource covering all 50 US states and DC. Every claim cites the specific state statute. Not legal advice.
Lookup tools (all 50 states + DC):
- Security Deposit Lookup — return deadlines, deposit limits, allowable deductions, and penalty multipliers for wrongful withholding
- Landlord Entry Lookup — required notice periods, permitted entry reasons, and tenant remedies for unauthorized entry
- Eviction Lookup — notice periods by eviction type, filing procedures, and tenant protections
- Rent Increase Lookup — required notice periods, rent control applicability, and anti-retaliation protections
- Lease Break Lookup — landlord's duty to mitigate, penalty-free exit rights (military, DV, habitability), and early termination fee limits
- Habitability & Repair Rights Lookup — implied warranty of habitability, repair-and-deduct rights and caps, rent withholding/escrow procedures, and retaliation protections
Guides:
- Security Deposit Basics
- What to Do If Your Landlord Won't Return Your Deposit
- What to Do If Your Landlord Enters Without Notice
- The Eviction Process Step by Step
- How to Fight an Illegal Rent Increase
- How to Break a Lease Without Paying the Full Penalty
- What to Do If Your Landlord Won't Make Repairs

## Contact

Use the contact form at https://mrknowitall.net for general enquiries.