All-In-One Calculator

allinonecalculator.com

Contains adsIn-app purchases

About this app

The original All-In-One Calculator for Android
It's a FREE, complete and easy to use multi calculator & converter.

What does it do?
Designed with simplicity in mind, it helps you solve everyday problems.
From simple or complex calculations, to unit and currency conversions, percentages, proportions, areas, volumes, etc... it does it all. And it does it good!

This is the PERFECT Calculator
Passionate development combined with constant feedback we receive from our users resulted in that we think is the best multi calculator on the store.
Featuring over 75 FREE Calculators and Unit Converters packed in with a Scientific Calculator, it's the only calculator you will need from now on on your device.

Oh, and did we say it is completely FREE?
Yes, it is free. We think everyone should enjoy this.

If you are a student, teacher, engineer, handyman, contractor or just somebody who struggles with math & conversions, you really should give this one a try.
• Use it for simple or complex calculations
• Convert units or currencies in the same app
• Enjoy easier homework or school assignments

So, on with the features...

MAIN CALCULATOR
• Clear design with big buttons
• Multiple calculator layouts
• Editable input & cursor
• Copy & paste support
• Scientific functions
• Fraction calculator
• Calculation history
• Memory buttons
• Home widget

75 CALCULATORS & CONVERTERS
• Algebra, Geometry, Unit Converters, Finance, Health, Date & time
• Currency converter with 160 currencies (available offline)
• Instant results delivered as you type
• Smart search for faster navigation

Algebra
• Percentage calculator
• Proportion calculator
• Ratio calculator
• Average calculator - arithmetic, geometric and harmonic means
• Equation solver - linear, quadratic and equation system
• Greatest common factor & Lowest common multiple calculator
• Combinations and permutations
• Decimal to fraction
• Fraction simplifier
• Prime number checker
• Random number generator

Geometry
• Shape calculators for square, rectangle, parallelogram, trapezoid, rhombus, triangle, pentagon, hexagon, circle, circle arc, ellipse
• Body calculators for cube, rect. prism, square pyramid, sq. pyramid frustum, cylinder, cone, conical frustum, sphere, spherical cap, spherical frustum, ellipsoid

Unit converters
• Acceleration converter
• Angle converter
• Length converter
• Energy converter
• Force converter
• Torque converter
• Area converter
• Volume converter
• Volumetric flow converter
• Weight converter
• Temperature converter
• Pressure converter
• Power converter
• Speed converter
• Mileage converter
• Time converter
• Digital storage converter
• Data transfer speed converter
• Numeric base converter
• Roman numerals converter
• Shoe size converter
• Ring size converter
• Cooking converter

Finance
• Currency converter with 160 currencies available offline
• Unit price calculator
• Sales tax calculator
• Tip calculator
• Loan calculator
• Simple / Compound interest calculator

Health
• Body mass index - BMI
• Daily calories burn
• Body fat percentage

Date & time
• Age calculator
• Add & subtract - Add or subtract years, months, days, hours and minutes from a date
• Time interval - Calculate the difference in time between two dates

Miscellaneous
• Mileage calculator
• Ohm's law calculator - voltage, current, resistance and power

Developed in Transylvania 🇷🇴

Ratings and reviews

I downloaded this app for the widget, but the widget is very imprecise. 1/100 and 1/160 both gave me 0.01. Not really useful for me since I want more than two decimal places. The app itself does the math right and seems to have a lot of useful tools, so it's worth giving a look. I'm not going to delete it yet, but I might if I don't find myself using the other functions.

Hands down the best calculator app I've used. Highly customizable for just about every calculation you would need for everyday use. Currently has over 70 different calculation options (length, area, volume, speed, force, distance, data, time, etc). Better yet is the ability to enter one value, say 1 mile for distance and see its equivalent value for every other measurement in that category (km, ft, light-year, etc). Has ads but works perfectly without wifi. $5 in-app upgrade removes ads forever.

Samsung phone somehow did not come with calculator pre installed, go figure, so I downloaded this one. Easily one of the best apps, even has dark mode & a bit of customization options. Lots of measurements, conversion tools, and extras. 10/10. Edit: 2026, they changed the layout and added intrusive ads. Skip this. 1 out of 5 now.

What’s new

Advanced calculator options
• New toggle to remember last calculation
• New toggle to keep screen on

Unit converter improvements
• Added 450+ new units across all converters
• Added more combined units where possible
• Removed icons for a cleaner look
• Grouped units by category