The investor and professional category — thirty-one tools in two groups. Deal math: the cap rate calculator (income yield that prices rental property), cash-on-cash return (the actual annual cash flow on your invested dollars), the DSCR loan calculator (the debt-service-coverage ratio investor lenders underwrite on), LTV, house flipping costs, mortgage refinance, and the HECM proceeds calculator for reverse mortgages. The chain to internalize: price on cap rate, finance on DSCR, and know that lenders typically want 1.20-1.25 or better — the property's income, not your salary, is what qualifies the loan.
Document and field work: the summarizers and classifiers — home inspection notes, lease clauses in plain English, listing description quality, buyer email priority, mortgage document routing — plus the practical outdoor calculators (lot size, gravel). The lease-clause tool deserves a note: it translates the section of a lease that will matter most during a dispute into ordinary language, which is exactly when you want to have read it — before signing, not after.
| If this is you… | Start with | Because |
|---|---|---|
| Screening a rental property listing | Cap Rate + Cash-on-Cash Calculators | Yield and actual cash return, the two screens that filter fast |
| Getting financing as an investor | DSCR Loan Calculator | Property income coverage is what investor lenders underwrite |
| Reading a lease before signing | Lease Clause Plain-English Summarizer | The binding fine print, translated before it binds you |
| Inspecting a property or planning site work | Inspection Note Summarizer / Lot Size + Gravel Calculators | Field notes and materials math for the physical side |
How we order these tools: deal-stage order: screen, finance, then manage the paperwork. Yield screening leads — it decides which deals deserve the paperwork.
Real Estate
Investment property, mortgage, commission and property-tax calculators for buyers, owners and investors.
Airbnb / Short-Term Rental Profit Calculator
Estimates annual and monthly profit for a short-term rental from nightly rate, occupancy, stay length, fees, cleaning, utilities and mortgage. Also shows break-even occupancy and a comparison with renting long term.
Buyer Email Priority Classifier
Paste a buyer's email and an AI model in your browser rates priority from financing and timing signals and lists reply points. Free, private.
Cap Rate Calculator - Capitalization Rate for Real Estate
Divide a property's net operating income by its price to see the cap rate, and judge a deal in seconds.
Cash on Cash Return Calculator
Measure the first-year pre-tax return on the cash you actually put into a rental, including down payment, closing costs and rehab.
Concrete Calculator
Calculate concrete volume needed for slabs, columns, footings, walls, stairs, and curbs. Includes waste factor and bag estimates.
DSCR Loan Calculator for Rental Properties
Find the debt service coverage ratio on a rental, the rent a lender needs to see, and the largest DSCR loan the property can support.
FHA Loan Calculator
Estimate your FHA mortgage payment including upfront and annual mortgage insurance, then compare it against a conventional loan.
Gravel Calculator
Work out how many cubic yards and tons of gravel, crushed stone or river rock you need for a driveway, path or bed, with extra for compaction.
HECM Reverse Mortgage Proceeds Calculator
Estimate how much cash a HECM reverse mortgage could put in your hands after it pays off your current mortgage and the upfront costs: maximum claim amount, principal limit, 2% upfront MIP, origination fee, the first-year disbursement cap, payout options, and loan balance and home equity at 5, 10 and 20 years.
Home Equity Calculator
See how much equity you have in your home, your LTV and combined LTV, how much a lender could let you borrow, and how equity grows as you pay down the mortgage.
Home Inspection Note Summarizer
Sort home inspection notes into safety items, major systems and minor repairs with an AI model in your browser. Free, private, no signup.
House Flipping Calculator: Profit, ROI & 70% Rule
Estimate a fix-and-flip deal's net profit, cash needed, ROI and annualized ROI, and test the price against the 70% rule maximum offer.
Lease Clause Plain English Summarizer
Paste a lease clause and an AI model in your browser restates it in plain English and lists what it leaves unsaid. Not legal advice. Free, private.
Listing Description Quality Checker
Paste a listing draft and an AI model in your browser flags filler, missing facts and fair-housing wording risks. Private. Not legal advice.
Lot Size Calculator (Acreage)
Find the area of a lot in acres, square feet and hectares from its length and width, from four sides plus a diagonal for irregular lots, or from survey corner coordinates.
LTV Calculator (Loan-to-Value Ratio)
Calculate loan-to-value ratio for mortgages and refinancing. Check if you meet lender LTV requirements. Free LTV calculator.
Mortgage Document Type Router
Paste a mortgage packet's document list and an AI model in your browser files each as income, assets, property and more. Free, private, no signup.
Mortgage Refinance Calculator
Calculate your potential savings and new monthly payments when refinancing.
Neighborhood Note Signal Extractor
Paste neighborhood notes and an AI model in your browser lists positives, concerns and what to verify in person. Free, private, no signup.
Open House Feedback Summarizer
Paste open house feedback and an AI model in your browser groups likes, concerns, price comments and follow-ups. Free, private, no signup.
Paint Calculator
Estimate how many gallons of paint and primer a room needs from its size, doors, windows, number of coats and the coverage on the can.
PMI Calculator
Calculate private mortgage insurance (PMI) costs. Estimate monthly PMI payments and when you can remove PMI. Free PMI calculator.
Price Per Square Foot Calculator - Real Estate Comparison
Calculate price per square foot for any property and compare up to three listings side by side to find the real value.
Property Photo Alt Text Preview
Choose a property photo and image models in your browser draft editable alt text and a file name. The image never leaves your device. Free, no signup.
Property Tax Calculator
Calculate your property tax based on home value and local tax rate.
Real Estate Commission Calculator - Agent Fees & Net Proceeds
Calculate real estate agent commissions, buyer and listing agent splits, and your net proceeds from a home sale, with percentage or flat-fee options.
Renovation Scope Classifier
Paste a renovation scope and an AI model in your browser rates it cosmetic, moderate or major and lists likely permits. Private. Not legal advice.
Rent Per Square Foot Calculator
Calculate rent per square foot, effective monthly cost, annualized rent per square foot, concessions, fees, and market rent differences for apartments and leases.
Rental Application Risk Note Analyzer
Organise notes on a rental application with a quick word check in your browser. No AI model runs and nothing is uploaded. Not legal advice.
Rental Property Calculator - Cash Flow & ROI Analysis
Analyze a rental property's cash flow, cash-on-cash return, cap rate, and NOI to see whether the deal actually makes money.
Roommate Rent Split Calculator
Splits a shared rent four ways: equally, by room size, by room size adjusted for private baths and shared space, and by income. Shows each person's difference from an equal split and share of income.
Square Footage Calculator
Add up the square footage of rooms and areas of any shape (rectangles, L-shapes, triangles, trapezoids and circles) in feet and inches or meters, with an optional cost estimate.