House Affordability Calculator (Max Home Price + Payment)

Use this house affordability calculator to estimate the highest home price you can afford and the monthly housing payment it would create, including taxes, insurance, HOA, and mortgage insurance. It also shows what rule limits you most (DTI, housing ratio, budget, or cash to close) so you know what to change. Annual household income (before … Read more

Rental Property Calculator (Cash Flow, Cap Rate, Cash-on-Cash)

Use this rental property calculator to estimate monthly cash flow, net operating income (NOI), cap rate, and cash-on-cash return from rent, financing, and common expenses. Purchase price (USD) ? The price you pay for the property (not including closing costs). Expected monthly rent (total) (USD/month) ? Total rent you expect to collect each month if … Read more

Rent Calculator (Affordable Rent and Qualification Estimate)

Use this rent calculator to estimate a monthly rent you can afford based on your take-home pay (net), your bills, and your savings goal, then compare it to a landlord-style estimate based on gross income (before taxes). This is a budgeting estimate, not a guarantee of approval. Calculator mode ? Budget-based affordability Landlord-qualification estimate Choose … Read more

Debt-to-Income (DTI) Ratio Calculator

Use this debt-to-income (DTI) ratio calculator to turn your income and monthly debt payments into a percent, like many lenders do. You can also see a housing-only (front-end) DTI and how much your debt or income would need to change to hit a target DTI. Gross income amount ? USD Enter your gross income (before … Read more

Hubble Law Distance Calculator

Use Hubble’s law to estimate a galaxy’s distance from its recessional velocity (or do the reverse), with optional redshift input for low z and built-in unit conversions. This is a linear approximation that works best for relatively nearby galaxies, so the calculator also flags when your inputs may be outside that range. What do you … Read more

Wavelength to Energy Calculator (Photon Energy in eV and J)

Convert one known light value (wavelength, frequency, or energy) into the other two using the standard light equations, with an optional refractive index for wavelength in a medium. What do you know? ? Pick one quantity you have: wavelength, frequency, or energy. The calculator computes the other two. Wavelength Frequency Energy Known value ? Enter … Read more

Simple Interest Loan Calculator

Calculate simple interest on a loan using principal, rate, and time. See total interest, total payback (including optional fees), and an equivalent monthly amount. Loan amount (principal) USD Interest rate (simple APR) % Simple interest means it uses the original principal for interest math (no compounding [interest earning interest]). Loan term (years) yr Loan term … Read more

Interest Rate Calculator

Solve the interest rate from a loan amount, loan term, and monthly payment. Optionally subtract taxes, insurance, or other non-loan costs. Loan amount (principal) USD Loan term (years) yr Loan term (months) mo This uses standard monthly payments (principal + interest [the part that pays down the loan plus the cost of borrowing]). Monthly payment … Read more