🇺🇸🇬🇧🇦🇺🇨🇦🇮🇳🇳🇿 Works Globally

Free Online Calculators
for Everyone, Everywhere

40 free calculators for finance, tax, health, fitness and everyday life — instant results for the US, UK, Australia, Canada, India and New Zealand. No sign-up, always free.

40

Free Tools

6

Countries

35

How-To Guides

0

Sign-ups

💰 Finance Calculators

Mortgage, loans, savings, investing and retirement planning

Mortgage CalculatorPopular

Monthly repayments, total interest and amortization. US, UK, AU, NZ and CA.

Mortgage AffordabilityNew

How much can you borrow? Based on income and country-specific DTI rules.

Loan Calculator

Monthly payments and total interest for any personal or car loan.

Credit Card PayoffNew

How long to become debt-free — and how much interest you save.

Compound Interest

Watch your savings grow with daily, monthly or annual compounding.

Investment ReturnNew

Calculate CAGR and total portfolio value for any investment.

Retirement Calculator

How much to save monthly and when you can retire.

Savings GoalNew

How long to reach any savings target, with interest factored in.

Calculate and split a restaurant bill for any group size.

India-specific equated monthly instalment for home, car and personal loans.

💼 Tax & Salary Calculators

Take-home pay, tax refunds, VAT and stamp duty

Salary Calculator (US)

Take-home pay after federal tax, Social Security and Medicare.

Tax

Salary Calculator (UK)

PAYE, National Insurance and student loan take-home calculator.

Tax

Salary Calculator (AU)

ATO 2024/25 rates, Medicare Levy and HECS take-home pay.

Tax

Salary Calculator (NZ)

PAYE, ACC earner levy and KiwiSaver deductions for NZ.

Tax

Salary Calculator (CA)New

Federal + provincial tax, CPP and EI for all 10 Canadian provinces.

Tax

Tax Refund (US)

Estimate your US federal refund or balance owed.

Tax

VAT CalculatorNew

Add or remove UK 20%, EU and other VAT rates from any price.

Tax

GST CalculatorNew

Add or remove 10% AU GST or 15% NZ GST from any price.

Tax

SDLT for England, LBTT for Scotland, land duty for Australia.

Tax

Percentage Calculator

All three percentage types — what % of, what % is, and % change.

❤️ Health & Fitness Calculators

BMI, body fat, calories, macros, hydration, sleep and running

BMI CalculatorPopular

Body Mass Index for adults and children. Metric and imperial.

Body Fat Calculator

Navy circumference method — more accurate than BMI for body composition.

Daily calorie needs using the Mifflin-St Jeor formula and activity level.

Macro CalculatorNew

Daily protein, carbs and fat for fat loss, maintenance or muscle gain.

Ideal WeightNew

Healthy weight range using BMI, Devine, Robinson and Hamwi formulas.

Water IntakeNew

How much to drink daily based on weight, activity and climate.

Running PaceNew

Pace, finish time and distance for 5K, 10K, half and full marathon.

Sleep CalculatorNew

Best wake or bedtimes based on natural 90-minute sleep cycles.

Due Date Calculator

Pregnancy due date, trimester dates and milestone tracker.

Ovulation CalculatorNew

Fertile window and ovulation date based on your cycle length.

📅 Date & Time

Age, date differences and time arithmetic

Exact age in years, months and days from any date of birth.

Date

Date Difference

Days, weeks and months between any two dates. Business days too.

Date

Time CalculatorNew

Add, subtract and convert hours, minutes and seconds. Decimal hours.

🔧 Converters & Tools

Currency, units, area, scientific calculator, password generator and GPA

Currency ConverterPopular

30+ world currencies with live mid-market rates.

Length, weight, temperature, volume, area, speed and more.

Area CalculatorNew

Square footage and square metres for rooms, circles and triangles.

Scientific CalculatorNew

Trig, log, powers, roots and keyboard support.

Math

Password GeneratorNew

Strong random passwords with configurable length and characters.

Tool

Weighted, unweighted and cumulative GPA on the 4.0 scale.

📚 Calculator Guides

Step-by-step guides explaining how every calculation actually works

How Compound Interest Works

The formula, the Rule of 72, and why starting 10 years earlier can double your final balance.

🏖️ Retirement

How Much Do I Need to Retire?

The 4% rule and 25× formula — calculate your exact retirement number.

🇬🇧 UK Tax

UK Take-Home Pay Guide 2025

PAYE, National Insurance and student loan — full worked example.

How Much Can I Borrow?

US DTI rules, UK income multiples, AU serviceability and NZ DTI caps.

What Is TDEE and How to Calculate It

BMR, activity multipliers and calories for fat loss, maintenance or muscle gain.

The only fair way to compare investment returns — formula, benchmarks and examples.

View all 35 guides →