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

Edit: still terrible after the update; what happened to continuously displaying the fractional equivalent of decimals? Man this new design really broke it. Since the update (around March 2025) the appearance has changed significantly, which would be fine except now the buttons don't respond the same. They often miss my taps and a few times have just frozen. Sadly this calculator is starting to become less reliable, which sucks because I use it everyday for both calculations and conversions.

I really like this calculator, so much that I paid the one time lifetime access payment. but there is one thing I wish the devs would add in an update: a discount calculator, for discount only. I've spent the last few hours playing w/the app, & yes if you know your maths you can make do with some of the included calculator modes, but one devoted to discount only would greatly be appreciated by myself & many others. that's the reason for 4 stars. EDIT: omg! thank you guys! Idk how I missed it!

Very upset that all settings and favorites were lost and without any warning as the app auto updated. Would like a way to go back to the old UI. New UI makes things larger and more spread out. this causes longer numbers to be cut off in the unit converters. Also things do not get saved anymore such as setting numeric base, the. closing out and coming back resets to default base values.

What’s new

Version 3.0.5
Choose between two calculator layouts
• Classic - Round, big buttons in a 4-column layout
• Modern - Square buttons in a 5-column layout
Try the new fraction operator
• Use "/" to get your result as a fraction
• Example: 1/2+3/4 → 5/4
You can now show or hide the memory buttons
Bug fixes, improvements, new units, etc..