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A2ZCalc

Financial & Everyday Calculators

73 free calculators for loans, investments, health and quick maths.

Financial Calculators

Tax & Salary

Federal Tax Refund Calculator (2026)
Estimate your US federal tax refund for tax year 2026 from gross income, filing status, withholding and deductions (standard or itemized).
US Take-Home Salary Calculator (2026)
Calculate your US net paycheck for 2026 (federal tax, FICA, state tax, 401(k), health insurance) with bi-weekly, monthly and annual breakdowns.
Income Tax Calculator
Estimate income tax for any country using your own editable progressive tax brackets: enter any rates and thresholds for any tax year.
Take-Home Salary Calculator
Estimate your net take-home pay after tax, retirement contributions and deductions.
VAT Calculator
Add or remove VAT from any amount for UK, EU and global VAT rates. Supports standard, reduced and zero rates.
Sales Tax Calculator
Add sales tax to a price or back it out of a total, with an editable average combined rate for every US state from Tax Foundation data.
Paycheck Calculator (US)
Estimate your net take-home pay per paycheck after federal tax, Social Security, Medicare and state income tax for all 50 US states.
Overtime Pay Calculator
Calculate overtime pay from an hourly rate, regular and overtime hours, and a multiplier, plus optional double-time hours and the effective hourly rate.
Hourly to Salary Calculator
Convert an hourly wage to annual, monthly, biweekly, weekly and daily pay, or work out the hourly rate behind a salary.
UK Take-Home Pay Calculator (2026/27)
Calculate UK take-home pay for 2026/27 (income tax, National Insurance, student loan and pension) for England, Wales, Northern Ireland and Scotland.

Investing & Savings

UK ISA Calculator (2026-27)
Project the future value of your UK ISA contributions for the 2026-27 tax year. Supports Stocks & Shares, Cash and Lifetime ISA with 25% government bonus.
TFSA Calculator
Calculate your total Canadian TFSA contribution room since 2009, check for over-contributions, and project tax-free growth from monthly contributions.
Compound Interest Calculator
See how savings grow over time with compound interest and optional regular contributions.
Recurring Investment Calculator
Project the future value of any recurring monthly investment given the contribution, expected annual return and time horizon.
Inflation Calculator
See how inflation changes the purchasing power and future cost of a sum of money.
Simple Interest Calculator
Calculate simple interest and the maturity amount on a principal sum, for any annual rate, period and currency without compounding.
Investment Return (ROI) Calculator
Work out what an investment really returned, including regular contributions: money-weighted annual return, total return and net profit.
Lump Sum Investment Calculator
Estimate the future value of a one-time lump sum investment at a given annual return over any period, with monthly or annual compounding.
Savings Goal Calculator
Work out the monthly saving needed to reach a financial goal by a target date.
529 College Savings Calculator
Project how much your 529 college savings plan will grow given monthly contributions, investment return and years until enrollment.
CAGR Calculator
Calculate Compound Annual Growth Rate, or solve it backwards for the ending value or the years needed to reach a target.

Health Calculators

Everyday Calculators

Percentage Calculator
Work out percentages, percentage change and what percent one number is of another.
Tip Calculator
Calculate the tip on a restaurant bill at any percentage and split the total fairly between any number of people in seconds.
Age Calculator
Calculate your exact age in years, months, days and total days from any date of birth, plus a countdown to your next birthday.
Discount Calculator
Calculate the sale price and money saved after a percentage discount, with support for chained or stacked discount offers.
Quadratic Equation Solver
Solve any quadratic equation axยฒ + bx + c = 0. Returns roots, discriminant, vertex and axis of symmetry.
Date Difference Calculator
Calculate the exact number of days, weeks, months and years between any two dates, with business-day and weekend breakdowns.
Mean, Median & Mode Calculator
Paste a list of numbers and get the mean, median, mode, range, standard deviation and more.
Triangle Calculator
Enter three sides of a triangle to find the area, perimeter, angles and type (equilateral, isosceles, scalene).
Fuel Cost Calculator
Estimate the fuel cost of a trip from distance, fuel economy and fuel price.
Prime Number Checker
Check whether a number is prime, find its factors, and see the nearest prime numbers above and below it.
GPA Calculator
Calculate your Grade Point Average from course grades and credit hours, for both letter-grade and percentage-based grading systems.
Grade Calculator
Calculate your current weighted grade from any number of categories, or solve for the score you need on a remaining category to hit a target.
Hours Calculator
Calculate hours worked between a start and end time, including overnight shifts and an unpaid break, as hours and minutes or decimal hours.