All-In-One Calculator

Name: All-In-One Calculator
Availability: InStock
Rating: 4.699999809265137 (169880 reviews)
Author: allinonecalculator.com

allinonecalculator.com

Contains adsIn-app purchases

170K reviews

PEGI 3

10M+

Downloads

PEGI 3

Learn more

About this app

All-In-One Calculator combines a clean scientific calculator with 50+ calculators and unit converters for everyday use. Get more from your calculator — for FREE!

🏆 Trusted by over 10 MILLION users worldwide!

Scientific calculator
• Trigonometry, logarithms, exponents
• Graphing calculator: plot functions
• Complex number support (√-1 → i)
• Fraction results (0.3333 → 1/3)
• Memory buttons: MC, M+, M-, MR
• Calculator history with notes

Currency converter
• 160+ currencies, live exchange rates
• Convert multiple currencies at once
• Works 100% offline

Unit converter
• Length, weight, volume, temperature
• Area, speed, pressure, power, energy
• Digital storage, cooking, shoe size
• Regional, historic & scientific units
• Combined units (ft + in, L + mL)

Math calculators
• Percentage calculator & discount
• Average & proportion calculator
• Equation solver: linear, quadratic, etc.
• Area & volume of shapes and bodies
• Step-by-step solutions

Finance calculators
• Tip calculator & sales tax calculator
• Loan & interest calculator
• Unit price comparison

Date & health
• Age calculator & date calculator
• Time between two dates
• BMI, body fat & calorie calculator

Extra features
• Cloud sync across your devices
• Calculator widget for your home screen
• Simple, classic & modern layouts
• AMOLED dark theme to save battery

👋 A note from the developer

Hi, I'm Andrei, the developer behind this app. My goal since 2016 has been to create the most comprehensive, clean and easy-to-use calculator on the market, continuously improving it based on your feedback.

Try it out and let me know what you think!

The original All-In-One Calculator with Unit & Currency Converter

Updated on

Aug 12, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.

No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App activity and 2 others
Data is encrypted in transit
You can request that data be deleted

Ratings and reviews

164K reviews

Ilia Kowalzik

July 26, 2025

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.

64 people found this review helpful

Proffessor Xhem

September 15, 2026

I got the lifetime pro version of this app years ago because I believe this to be the best calculator I'd used up to that point period. For some reason I no longer have access to it. Hitting the "Restore purchase button literally does nothing and I'm starting to think that the devs just wants another purchase. I really did love this app and found it useful. It would cost 3x the amount that I paid for it and I find that to be insane. "Lifetime" is supposed to mean LIFETIME!

5 people found this review helpful

Toshe Andonov

August 25, 2026

I have already bought the lifetime access for this app a couple of years ago. I am seeing ads all of a sudden. Been using this app for years. Their contact page has not been working for a month. I've sent an email, without a response. No idea what this is. Hitting the very very very small text 'restore purchases' on the 'Upgrade to pro' page - does nothing. OK. Everything is good on my tablet. This is a problem on my phone.

1 person found this review helpful

allinonecalculator.com

August 25, 2026

Hi Toshe. Have you tried pressing the "Restore purchases" button? The app checks for purchases on start-up and every two hours. This happens, altough rarely, so pressing that button should fix your issue. Sorry for the trouble!