Speed Calculator

Ninth Gate Doorkeeper

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About this app

How fast can you calculate?

Speed Calculator is the mental math quiz that challenges you to answer 10 questions as quickly as possible — and then beat your own best time.

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HOW IT WORKS
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Pick a category and a number limit, then race through 10 questions. Each question shows 6 possible answers — tap the right one as fast as you can. Your total time is recorded the moment you finish.

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4 CATEGORIES
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• Addition — train your sums up to the limit you choose
• Subtraction — sharpen your mental subtraction skills
• Multiplication — master your times tables and beyond
• Division — practice clean, fast division

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7 DIFFICULTY LEVELS
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Choose your number limit: 10, 50, 100, 250, 500, 1000, or 10 000. Start easy and work your way up as your speed improves.

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TRACK YOUR PROGRESS
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Your best time for every category and difficulty level is saved automatically. Every quiz is a chance to set a new personal record.

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CLEAN & DISTRACTION-FREE
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No accounts, no subscriptions, no complexity. Just you, the numbers, and the clock.

Available in 10 languages: English, French, German, Spanish, Italian, Polish, Portuguese, Russian, Korean, and Chinese.