Apps That Run More Than One Calculator at Once

“Multi calculator” means two different things on the App Store. Most apps using the phrase offer many kinds of calculator — a tip calculator, a loan calculator, a BMI calculator — one at a time. A much smaller group runs several calculators simultaneously on one screen. This page is about the second kind, which is the one people searching for “two calculators at once” actually want.

What is in the category

Panel counts and features checked against each app’s public App Store listing on September 1, 2026. Verify the current listing before deciding — these apps update.

Which one to pick

If the panels need to do different things and talk to each other

This is the case CalcBoard was built for, and it is the case the category has historically handled worst covers. Each panel runs a different mode — scientific next to a unit converter next to programmer — and results move between panels through a shared value tray or named variables that work everywhere. Everything else here gives you the same basic calculator twice.

If you want a lot of calculations visible at once

CalcBoard runs eight, each independent, on the view that a phone screen stops being readable past that. Multiple Calculators offers ten basic panels if sheer count is what you are after.

If two plain calculators is genuinely all you need

A dedicated dual calculator does that with a simpler interface. So does CalcBoard’s free tier — two independent panels, no ads, nothing to pay — with four modes, exact decimal arithmetic and up to eight panels there if you ever want them.

If you are on Android

CalcBoard is iPhone and iPad only (plus Apple Silicon Macs and Apple Vision). Calc x2 is the established two-pane option on Android.

What CalcBoard adds beyond panel count

• Four modes per panel: basic, scientific, programmer (four bases at once), and a 79-unit converter.
• Exact decimal arithmetic — 0.1 + 0.2 is exactly 0.3, which matters when the two numbers you are comparing differ by pennies.
• No ads in any version, and no subscription — $2.99 once.
• iPad layouts and Split View, plus Apple Silicon Macs and Apple Vision through iPad app compatibility.
• Searchable history with bookmarks, labels, and CSV export.

Why this category exists at all

Because iOS will not do it for you. iPhone has no split-screen multitasking, and iPadOS will not open two copies of the same calculator app side by side. There is no system-level way to see two calculators at once, so it has to be solved inside an app — the full explanation, including the workarounds that do not need any app, is here.

Frequently Asked Questions