CalcFit: Mental Math

    CalcFit: Mental Math is a mental math trainer for iPhone and Android, with practice that adapts to you. Run short speed drills and timed multiplication tests on times tables, squares and cubes for free, with percentages, fractions and estimation added by CalcFit Plus, and build a daily streak. It works offline and needs no account.

    CalcFit mental math trainer: speed drills for sharper arithmetic, showing a timed 47 times 6 question

    Coming soon to the App Store and Google Play

    CalcFit is not available to download yet. Want a note when it launches? Email info@etestweb.com.

    See CalcFit in action

    • CalcFit timed drill: a countdown ring, question 5 of 7 and a correct answer on the keypad screen
      Timed speed drills
    • CalcFit session results: 4 of 7 correct, average speed, best streak, total time and a weak spot in Tables
      Accuracy and speed
    • CalcFit drill picker: Mixed speed round (your unlocked skills, 60 s limit), Tables, and Squares and Cubes are open; Percentages, Estimation and Fractions show a lock and Included in CalcFit Plus
      Pick your drill
    • CalcFit progress screen with a 7-day accuracy chart, a streak grid and skill levels, shown with CalcFit Plus
      Progress charts (CalcFit Plus)
    • CalcFit home screen with a 12-day streak, today's Tables session and this week's practice days
      Daily streak

    Mental arithmetic training, one skill at a time

    Mental math speed drills

    Short rounds of mental arithmetic training with a visible timer. Each answer is scored for accuracy and speed, so you can see how accurate and how fast you are.

    Timed multiplication tests

    Run a timed Tables drill, with factors from 2 up to 20 that grow as your level rises, or practice squares and cubes. Every set shows your accuracy and average speed, so you can aim to beat them next time.

    Mixed speed round

    A mixed speed round across your unlocked skills, with a 60-second limit. Tables, squares and cubes are free, and CalcFit Plus adds percentages, fractions and estimation to the mix. Free sets are capped at 7 questions, and Plus rounds run up to 50.

    Percentages

    Practice finding 10%, 15%, 25% and other common percentages quickly, the way you need them for tips, discounts and exam questions. Part of CalcFit Plus.

    Fractions

    Fractions of a number (such as 3/4 of 36) and fractions as percentages (such as 3/4 as a %, at higher levels), with the answer checked for you every time. Part of CalcFit Plus.

    Estimation

    Estimation drills train you to get close fast. Answers within a tolerance count, so you build the habit of rounding sensibly instead of calculating everything. Part of CalcFit Plus.

    Streaks and progress charts

    Keep a daily streak and level up each skill. Progress charts of your accuracy and speed over the last 7 days are part of CalcFit Plus.

    Works offline, with no account

    Practice on a flight, on the bus or anywhere with no signal. There is nothing to sign up for, and your progress and settings are stored only on your device. See the CalcFit privacy policy.

    How CalcFit works

    1. Step 1

      Pick what you are training for

      Say whether you are training for exams, interviews or just sharper arithmetic. CalcFit adapts to your answers as you practice.

    2. Step 2

      Start a session

      Pick a drill, or let the app choose a mixed round across your unlocked skills. Questions adapt to your level in each skill.

    3. Step 3

      Fix weak spots

      Your results show the skills where your accuracy fell below 70%, and the next session can start on the weakest one.

    4. Step 4

      Come back tomorrow

      Short daily sessions build a streak. An optional reminder is scheduled on your device only.

    Pricing summary

    Basic practice with times tables, squares and cubes is available with a daily session allowance, and you can watch an optional rewarded ad to unlock one extra session. Adaptive difficulty, weak-spot practice and a free streak freeze each week are included for everyone. CalcFit Plus adds the Percentages, Fractions and Estimation drills, unlimited sessions, longer 20-question sets and progress charts, plus an extra streak freeze for every 7-day streak.

    Monthly

    $3.99 per month

    Renews until you cancel.

    Yearly

    $19.99 per year

    Starts with a 7-day free trial for eligible new subscribers.

    Lifetime

    $39.99 once

    One payment, no renewal.

    Prices shown are US dollar base prices. Prices vary by country, and the store shows the exact price in your currency before you confirm. Subscriptions renew automatically until canceled in your App Store or Google Play subscription settings.

    Frequently asked questions

    Independence

    CalcFit is an independent practice tool. It is not affiliated with, or endorsed by, any school, exam board or testing body. The app CalcFit: Mental Math is published by John Osakwe (Etest Tech Hub). Last updated October 14, 2026.