Miacalc

Online Calculators Toolbox

39 free calculators · works instantly · all calculations run locally

Runs locally · no upload Instant · no sign-up 100% free · no ads
Popular Mortgage Income Tax Paycheck Scientific BMI Extra Payment / Early Payoff

Finance8

Mortgage Calculator
Monthly payment with taxes, insurance & PMI, plus full amortization schedule.
Extra Payment / Early Payoff Calculator
See how an extra monthly payment shortens your mortgage and how much interest you save.
Auto Loan Calculator
Monthly car payment, total interest and payoff schedule from price, down payment, APR and term.
Compound Interest Calculator
Project investment growth from a starting amount plus monthly contributions, with a growth chart.
Savings & CD Interest Calculator
Interest earned, ending balance and APY for a savings account or CD, simple or compound.
Home Affordability Calculator
How much house you can afford using the 28/36 rule, with max price, max loan and PITI breakdown.
Savings Goal Calculator
Monthly amount needed to reach a savings goal by a target date, with optional return.
Debt-to-Income Calculator
Front-end and back-end DTI ratios with mortgage approval guidance.

Salary & Tax6

Income Tax Calculator
Estimate 2025 federal income tax, effective rate and after-tax income by filing status.
Paycheck Calculator
Take-home pay after federal tax, Social Security, Medicare and state tax — per paycheck and per year.
Bonus Tax Calculator
Federal supplemental withholding (22%/37%), FICA and state tax on a bonus, with net take-home and effective rate.
Overtime Pay Calculator
FLSA time-and-a-half overtime: regular, overtime and total weekly pay.
Tenure Calculator
Exact years of service from hire date to any date.
Social Security Full Retirement Age Calculator
Find your Full Retirement Age (FRA) by birth year and see how claiming at 62 vs delaying to 70 changes your benefit.

Health & Life8

BMI Calculator
Enter height and weight to find your BMI and healthy weight range.
Age Calculator
Exact age in years, months and days, plus days to your next birthday and star sign.
Due Date Calculator
Estimate your pregnancy due date and gestational age from your last menstrual period.
Ovulation Calculator
Estimate your ovulation day, fertile window and next period from your cycle.
Body Fat Calculator
Estimate body fat % with the US Navy method and a BMI-based estimate.
Calorie Calculator
Find your BMR and TDEE with Mifflin–St Jeor, plus targets to lose or gain weight.
Ideal Weight Calculator
Ideal body weight by Devine, Robinson & Miller plus a healthy BMI range.
Child Height Predictor
Predict a child’s adult height from the parents’ heights (mid-parental method).

Utilities17

QR Code Generator
Turn a URL or text into a QR code; pick size and error correction; download PNG.
Percentage Calculator
Percent of a number, ratio, and percent change — three calculations in one.
Number to Words Converter
Spell out amounts in words for checks, invoices and contracts.
Discount Calculator
Find the sale price, amount saved and effective percent off.
Geometry Calculator
Area, perimeter and volume for circles, squares, rectangles, triangles and cylinders.
Fuel Economy Calculator
MPG, L/100km and km/L plus total fuel cost and cost per mile.
Countdown Calculator
Find out how many days until (or since) any date.
Base Converter
Convert between binary, octal, decimal and hexadecimal.
GPA Calculator
Find your weighted and unweighted GPA on the 4.0 scale from letter grades and credit hours.
Electricity Bill Calculator
Estimate your monthly electric bill from kWh usage and flat or tiered rates.
Word Counter
Count words, characters, sentences, paragraphs and reading time.
Unix Timestamp Converter
Convert Unix epoch time to a date and back — local and UTC, seconds or milliseconds.
Base64 Encode / Decode
Encode and decode Base64 with UTF-8 (Unicode) support.
Color Converter
Convert between HEX, RGB and HSL color codes with a live preview.
Scientific Calculator
Trig, log, powers, roots and π/e with keypad and keyboard input; degrees or radians.
Unit Converter
Convert length, weight, volume, temperature, area and data between US and metric units.
Date Calculator
Days between two dates, or add and subtract days from a date.

About Miacalc Online Calculators

Miacalc is a free collection of online calculators for everyday finance, health and productivity, with rules localized for the United States. Every tool runs entirely in your browser — no sign-up, no download, and no data is uploaded.

Note: results are for reference only. Always confirm with your bank, accountant or local regulations.