9 categories × 18 calculators

Every calculator you need.
Nine at a time.

Fast, accurate calculators for money, health, fitness, cooking, travel and more. No signup, no clutter — type your numbers, get your answer.
162
calculators
9
categories
free
no signup
Most popular calculators
finance
Mortgage calculator
Monthly repayments, total interest and full amortization schedule.
health
BMI calculator
Body mass index with healthy range — metric and imperial.
finance
Compound interest
Watch savings grow with monthly contributions and any compounding frequency.
health
TDEE calculator
Total daily energy expenditure and calorie targets for your goal.
finance
Currency converter
Live exchange rates for 30+ currencies, straight from the ECB.
health
Due date calculator
Estimated due date and week-by-week milestones from your LMP.
maths
Percentage calculator
Find X% of Y, percentage change, and what percent one number is of another.
pets
Dog age in human years
Your dog's real human-year age, adjusted for breed size.
travel
Fuel cost calculator
Trip fuel cost from distance and consumption — MPG or L/100km.
Browse all 9 categories
finance18
Everyday money · crypto & planning
health18
Body metrics · health tracking
fitness18
Performance · training
cooking18
Kitchen maths · nutrition
travel18
Trip planning · on the road
maths18
Numbers · geometry & stats
science18
Physics & chemistry · biology & earth
pets18
Dog & cat · all pets
pregnancy18
Pregnancy · baby & newborn

What is got9.com?

got9.com is a collection of 162 free online calculators organised into nine categories: finance, health, fitness, cooking, travel, maths, science, pets and pregnancy. Every calculator is a fast, standalone page with clear inputs and an instant result — no account, no download, no paywall. Whether you're working out a mortgage repayment, checking your BMI or scaling a recipe, the answer is a few keystrokes away.

Why nine of everything?

The site is built around a simple structure: nine categories, each with eighteen calculators arranged nine to a page. That constraint keeps every category focused on the tools people actually use, rather than padding lists with duplicates. Each page of nine covers a coherent theme — everyday money, body metrics, kitchen maths — so related calculators are always one click apart.

Accurate and transparent

Every calculator on got9.com uses standard, published formulas — from amortization maths for loans to the Mifflin-St Jeor equation for calorie needs and WHO growth standards for baby percentiles. Currency conversions use live European Central Bank rates. Where a result is an estimate, such as health metrics or medication guidance for pets, the page says so and explains the method behind the number.

Free, fast and shareable

All 162 calculators are free to use with no signup. Pages are lightweight and load quickly on any device, and every result can be shared with a single link that pre-fills your inputs — handy for comparing a mortgage scenario with a partner or sending a running pace to a training buddy. New categories are being added regularly, working towards the full nine.