Free Online Calculators & Converters

60 free tools for finance, health, maths, dates, and words — no sign-up, no downloads, works in your browser.

Browse All Tools →

Browse by Category

All 60 tools, grouped into five categories. Tap a section to see everything inside.

FinanceMortgages, loans, savings & returns 18 tools
Mortgage Calculator Mortgage Payoff Amortization Schedule Compound Interest Investment Calculator Savings Calculator How Long Will My Money Last Average Return ROI Calculator Take-Home Pay (UK) Interest Calculator Interest Rate Loan Payment Table Finance Calculator US Auto Loan LTV Calculator Pay Rise Calculator Credit Card Payoff Calculator View all Finance →
Date & TimeAges, durations, time zones & calendars 16 tools
Age Calculator Date Calculator Day Counter Day of the Week Week Number Time Calculator Time Duration Timezone Converter World Clock Timezone Map Daylight Saving Time Sunrise & Sunset Calendar Pregnancy Countdown Age Difference Business Days Calculator View all Date & Time →
HealthBody, fitness & nutrition metrics 14 tools
BMI Calculator BMR Calculator Body Fat Calculator Macro Calculator Lean Body Mass Healthy Weight Ideal Weight Protein Calculator Pace Calculator Steps Calculator Height Calculator Weight Calculator Sleep Calculator WHR Calculator View all Health →
MathsConverters, percentages & probability 8 tools
Unit Converter Base Converter Hex & RGB Converter Percent Calculator Probability Calculator Decimal to Fraction Fractions Calculator Ratio Calculator View all Maths →
WordsAnagrams, unscramblers & text tools 4 tools
Anagram Solver Word Unscrambler Wordle Solver Case Converter View all Words →
Advertisement
[Advertisement — 728×90 or 300×250]

Popular Tools

The most-used tools on yootils — click any to get started instantly.

Percentage Calculator
Find X% of Y, percentage change and reverse percentages.
Use tool →
BMI Calculator
Your Body Mass Index and healthy weight range.
Use tool →
Mortgage Calculator
Monthly repayments, total interest and LTV ratio.
Use tool →
Age Calculator
Your exact age in years, months, weeks and days.
Use tool →
Unit Converter
Length, weight, temperature, speed and volume.
Use tool →
Take-Home Pay
UK net salary after tax and National Insurance.
Use tool →
Date Calculator
Days between two dates, or add days to a date.
Use tool →
Sleep Calculator
Best bedtime or wake-up time by sleep cycle.
Use tool →
Compound Interest
How savings grow with monthly contributions.
Use tool →
Business Days
Working days between dates, minus bank holidays.
Use tool →
LTV Calculator
Loan to value, equity and the next rate band.
Use tool →
Pay Rise Calculator
What a rise really adds to your take-home pay.
Use tool →
Advertisement
[Advertisement — 728×90 or 300×250]

Simple tools for simple problems

Everything you need, nothing you don't.

Fast & private

Every calculation happens in your browser — nothing is sent to a server. Your data stays on your device. Learn more about yootils.

No sign-up required

All 60 tools are completely free with no account, no email, and no paywall. Open the page and start calculating.

Works on any device

Every tool is fully responsive — use them on desktop, tablet, or mobile. They're designed to work just as well on a small screen.

No downloads needed

Pure browser-based tools with no app to install. Bookmark the ones you use most and they're always one click away.