Calculator Place

Free, fast, no-signup calculators for money, health, and everyday life.

Calculator Place is a free, ad-supported collection of 50+ calculators covering personal finance, health and fitness, online seller fees, and everyday math. Every calculator shows its work and produces a shareable permalink — no signup, no email capture, no tracking beyond standard analytics.

New here? Browse the in-depth explainers in the Guides section.

Financial

Plan loans, investments, retirement, and more.

Auto Loan Calculator

Monthly payment and amortization schedule.

Mortgage Calculator

Monthly payment with tax, insurance, and PMI.

Mortgage Compare

Put two mortgages head-to-head with an overlay chart.

Refinance Calculator

When does the monthly savings cover closing costs?

Rent vs. Buy

Year-by-year break-even between renting and buying.

Credit Card Payoff

Months to payoff and total interest, two ways.

Debt Snowball/Avalanche

Snowball or avalanche debt payoff simulator.

Investment Calculator

Compound growth with monthly contributions.

Retirement Calculator

How much you need and whether you are on track.

401(k) + Employer Match

Future balance, employer match, missed-match alerts.

Roth vs. Traditional

Side-by-side Roth vs. Traditional IRA outcomes.

Paycheck Calculator

Take-home pay after federal, FICA, and state taxes.

Inflation Calculator

See how inflation erodes (or has eroded) purchasing power.

Net Worth

Add up assets and liabilities to get your net worth.

APR ↔ APY

Convert annual percentage rate to effective yield.

Health

BMI, calorie, heart rate, and hydration.

BMI Calculator

Body Mass Index in metric or imperial.

Body Fat (Navy)

US Navy tape-measure method.

Lean Body Mass

Boer, James, and Hume LBM estimates.

Calorie Calculator

BMR, TDEE, and macronutrient split.

Macro + TDEE

BMR, TDEE, and protein/carb/fat targets.

Target Heart Rate Calculator

Training zones and max heart rate.

VO₂ Max

Cooper test, resting HR, or Rockport walk.

One-Rep Max

Six formulas + %-of-1RM programming table.

Running Pace

Solve for pace, time, or distance; splits included.

Hydration Calculator

Daily water based on weight and activity.

Pregnancy Due Date

Due date, gestational age, and trimester.

Sellers

Marketplace fee calculators for eBay, Etsy, PayPal, and more.

eBay Fee Calculator

eBay final value fees, promoted listings, and net payout.

Etsy Fee Calculator

Etsy transaction, payment, and offsite ads fees with profit and goal-seek mode.

PayPal Fee Calculator

PayPal merchant fees for checkout, invoicing, micropayments, and reverse-fee lookup.

Stripe Fee Calculator

Stripe processing fees for cards, ACH, invoicing, subscriptions, with reverse-fee lookup.

Square Fee Calculator

Square fees for in-person, online, invoice, and keyed transactions with reverse lookup.

Mercari Fee Calculator

Mercari selling fee + payment processing with profit and goal-seek mode.

Poshmark Fee Calculator

Poshmark tiered fees ($2.95 under $15, 20% above) with profit and goal-seek mode.

Venmo Business Fee Calculator

Venmo Business profile fees (1.9% + $0.10) with optional instant transfer and reverse-fee lookup.

Shopify Payments Fee Calculator

Shopify Payments processing fees by plan tier (Basic/Shopify/Advanced/Plus), online vs in-person, plus third-party gateway surcharge.

Miscellaneous

Everyday calculators for tips, ages, dates, and units.

Percentage

Classic % calculations.

Fraction Calculator

Add, subtract, multiply, and divide fractions.

Scientific Calculator

Full expression evaluator with functions and constants.

GPA Calculator

Weighted GPA across up to 12 courses.

Sales Tax

Add tax to a price or back it out of a total.

Tip Calculator

Tip and split the bill.

Gas Mileage / MPG

MPG, km/L, L/100km, and trip cost.

EV vs. Gas

Fuel cost comparison over a multi-year horizon.

Unit Conversion

Length, weight, temperature, and more.

Time Zone Converter

Convert a moment across multiple zones at once.

Age Calculator

Your exact age plus zodiac and next birthday.

Date Difference

Business days, weeks, and midpoint between dates.

Hex ↔ RGB ↔ HSL

Convert between hex, RGB, and HSL color values.

Color Contrast (WCAG)

WCAG contrast ratio with AA/AAA pass–fail.

Random Generator

Secure random numbers, passwords, and strings.

Password Strength

Live entropy and crack-time estimate, 100% client-side.

QR Code Generator

Generate a QR code from any text or URL.

How we build these

Every calculator on the site is built from a published formula and tested against known reference values — textbook answers, regulator publications, or the original research papers the formula came from. Tax brackets, seller fee schedules, and similar figures are pulled from primary sources and updated as they change. Where a field has genuine disagreement (there are six accepted body fat formulas, for example), we pick a default that's well-cited and explain the alternatives in the matching guide.

More on the project on the About page or get in touch via Contact.