SigmaCalc - engineering calculator with Wolfram Alpha and LTE
A calculator that explains, not just computes. An ordinary, fast calculator day to day. Enter your PIN and it opens a panel with Wolfram Alpha, messages and a memory card - without reaching for your phone.
Type an equation and SigmaCalc reaches Wolfram Alpha over its own LTE modem, then shows the whole path: alternate form, roots, a plot and every intermediate step. You see why the answer is what it is - the difference between finishing homework and understanding the subject.
The on-screen keyboard mirrors the physical one underneath. A single key handles digits, letters and functions - you switch layers with fun and swap, and send submits the question.
A Quectel EG800K Cat-1 modem and six LTE bands. The device works on its own, at school, in a library or on a train. You can also send and receive text messages to stay in touch with home without pulling out a smartphone.
The extended panel is protected by a PIN you set yourself. Notes, formulas and messages on the microSD card are not available to anyone who simply picks the calculator up.
Polish, English and German, switchable in Settings at any time. That is also where you adjust display brightness and contrast, and check battery level and GSM signal strength.
SigmaCalc is built in Kraków. Every unit carries a plate on the back with its serial number and hardware revision. Under the service cover you will find the USB-C port, nanoSIM and microSD slots and a RESET button - no need to open the case.
| Dimensions | 141 × 139 × 17 mm |
| Display | 4.3" FSTN LCD, 240 × 64 px, LED backlight |
| Processor | ESP32-S3-WROOM-1-N4R2 |
| Modem | Quectel EG800K, LTE Cat-1 |
| LTE bands | B1, B3, B7, B8, B20, B28 |
| Battery | Li-Po 3.7 V, 1500 mAh, IEC 62133 compliant |
| Charging | USB-C, up to 700 mA, BQ25176J charger with BMS protection |
| Connectors | nanoSIM, microSD, USB-C - under the service cover |
| Battery life | up to approx. 25 h calculating, approx. 5 h with LTE active, over 2 years in deep sleep |
| Operating conditions | 0-40 °C, humidity 0-80 %, up to 2000 m above sea level |
| Languages | Polish, English, German |
Battery life figures are estimates derived from average current draw.
The device meets the requirements of directives 2014/53/EU (RED) and 2011/65/EU (RoHS) - EU Declaration of Conformity no. 01/2026. Electromagnetic compatibility was tested at the Central Laboratory of the Office of Technical Inspection (UDT) in Poznań, test report no. 19.5275_2026_1 of 24 March 2026.
12-month warranty, free software updates and dispatch within 24 hours. Free worldwide shipping.
Specifications
Battery life figures are estimates calculated from the average current draw given in the technical documentation. Compliance is confirmed by EU Declaration of Conformity no. 01/2026; EMC testing was carried out at the Central Laboratory of the Office of Technical Inspection (UDT) in Poznań.
Device demo
This is not just a picture. The calculator works for real, and PIN 12345 opens a panel with Wolfram Alpha, messages, and a memory card - exactly like on the actual device.
Customer reviews
FAQ
No. The device has its own LTE modem and connects to the internet on its own. You don't need a phone for calculations, for Wolfram Alpha or for messages.
Yes. SigmaCalc takes a nanoSIM card, which you insert under the service cover. No SIM card or data plan is included - you choose the carrier and plan yourself.
Day to day, the device behaves like an ordinary calculator. Entering the PIN opens a hidden menu with Wolfram Alpha, text messages and the memory card.
The factory PIN is 12345 and you can change it in the device settings. You can try it in the demo above - it works exactly like the hardware.
Only the exam organiser decides which calculators are allowed. SigmaCalc has an LTE modem and connectivity features, and many exam rules exclude devices with internet access.
Check the exam rules beforehand. The candidate is responsible for making sure the device is allowed in the exam room.
Shipping is free worldwide. We usually dispatch orders within 1-2 business days. For deliveries outside the European Union, the recipient may have to pay customs charges.
Yes, but only within Poland. Renting for 3 days costs PLN 600, for 7 days PLN 1,000 and for 14 days PLN 1,500. The refundable deposit is PLN 1,000. If you decide to buy after returning the device, we deduct half of the rental fee from the price of the calculator. You'll find the details in the rental section.
The product comes with a 12-month warranty, and as a consumer you also have 2 years of statutory liability for defects. Software updates are free and we provide them for at least 2 years from purchase.
Yes. SigmaCalc is covered by EU Declaration of Conformity no. 01/2026 under the RED 2014/53/EU and RoHS directives. Electromagnetic compatibility testing was carried out at the Central Laboratory of the Office of Technical Inspection (UDT) in Poznań. The device is designed and assembled in Poland.
Didn't find your question? Write to us: contact@sigmacalc.com
What's next
We are working on these features right now. They will reach you as an update, at no extra cost.
Closed and open-ended problems solved by ChatGPT - with just the answer or the full step-by-step reasoning. You can preview how it works in the demo above.
Upload PNG files to the microSD card and view them on the device's screen. Formulas, charts and visual notes always at hand.
We keep developing the software: faster search, more math functions and small fixes reported by users.
All updates are free for people who already own SigmaCalc - including the ChatGPT one. The price of the device for new customers will go up when it is released. Buy today, pay less and get the same.
Release dates and feature scope may change. Updates are delivered as described in § 9 and § 10 of the Terms of Service.
Upcoming update
The same device after the update. In Sigma mode, below "Calculator", you'll find ChatGPT: closed problems give just the answer, open-ended ones a step-by-step solution. Enter PIN 12345 and try it.
