Simple calculators that just work.
The Calcery is a fast, no-nonsense collection of 84 free calculators for finance, health, math, dates, and everyday life. No clutter, no sign-ups — just answers.
Private, sourced, reviewed — and calculated entirely in your browser.
Popular calculators
Browse by category
Finance & Loans
Mortgages, auto and personal loans, interest, and 401(k)/457(b) retirement withdrawals.
Tax & Paycheck
Take-home pay, sales tax by state, income tax, and paycheck withholding estimates.
Health & Fitness
BMI, calorie needs, macros, body fat, and other everyday health and fitness metrics.
Pregnancy & Baby
Due dates, ovulation windows, and pregnancy week-by-week timing calculators.
Math & Statistics
Percentages, fractions, ratios, averages, and everyday statistics calculators.
Education
GPA calculators and grade-weighting tools for students and teachers.
Date & Time
Age, date differences, work hours, and time-card calculators.
Home & Construction
Estimate materials for concrete, framing, roofing, interior finishing, landscaping, and HVAC — with the waste factor built in.
Automotive
Work out what a car actually costs — financing, leasing, fuel, EV charging, depreciation, tyres, and towing.
Everyday & Fun
Tip calculators, random number generators, and other quick everyday tools.
Free online calculators, built for accuracy
The Calcery covers ten categories and 84 calculators, and every one of them runs entirely in your browser — nothing you type is sent to a server. Our finance and loans tools cover mortgages, auto loans, personal loans, and retirement accounts, including 401(k), 457(b), and hardship withdrawal calculators that show what you actually keep after taxes and penalties. Tax & paycheck calculators handle take-home pay, sales tax by state, and income tax estimates.
The home & construction category is our largest, with calculators for concrete, framing, roofing, interior finishing, landscaping, and HVAC that build in a waste factor so you buy the right amount of material the first time. Automotive covers car payments, auto loans, and fuel costs, while health & fitness, pregnancy, math & statistics, date & time, and education round out the rest.
Every calculator ships with a worked example, a plain-language explanation of the methodology, and cited sources — IRS, CFPB, CDC, and similar authorities — so you can see exactly how the number was reached, not just what it is.
Guides
Longer explainers behind the numbers — how the formulas work and how to use them.
APR bundles your interest rate together with most loan fees into a single yearly cost — here is how it works and why it is usually higher than the rate you are quoted.
Lenders describe a mortgage payment with four letters — PITI. Here is what each part is, how escrow works, and why the total can drift up even on a fixed-rate loan.
Compounding is the engine behind long-term investing: you earn returns not just on what you put in, but on the returns themselves. Here is why time is your biggest advantage.