シキカル - 式を直せる電卓・時間・税計算

StackWorks LLC

About this app

This calculator displays the formula directly, allowing you to correct intermediate numbers by tapping.

It records office and store calculations like a single line in a ledger.

■ Correct Formulas by Tapping
Select and re-enter numbers, and the answer will update instantly. Supports operator substitution, term deletion, parentheses, and square roots. You can return to the original formula after opening AC or history.

■ Sales Tax and Rounding
Calculate with tax-inclusive and tax-exclusive amounts using the keys. Switch between 10% and 8% and display the breakdown of base price, sales tax, and tax-inclusive price. Round the tax amount to the nearest yen, either by rounding down, rounding to the nearest yen, or rounding up.

■ Time, Profit, Withholding Tax
You can input time into formulas, such as 8:30 + 7:45 = 16:15, or hourly wage 1,500 x 8:30 = 12,750. Minutes and seconds can be displayed from 0 to 59, even exceeding 24 hours.

This tool calculates the selling price from the cost and gross profit margin, the cost from the selling price and gross profit margin, and the gross profit margin from the cost and selling price. Selling prices are rounded to the nearest 1, 10, or 100 yen. Gross profit margin and markup percentage are also displayed.

This tool calculates withholding tax on Japanese remuneration and fees, displaying consumption tax, withholding tax amount, and net payment amount. You can switch between targeting the base price or tax-inclusive price. Users should confirm whether the remuneration is eligible and the terms of the transaction.

■ Calculate accurately and continue with the displayed values
Intermediate calculations are performed precisely using arbitrary-precision integers and rational numbers, and rounded only once at the final result. 0.1 + 0.2 = 0.3, 10 ÷ 3 × 3 = 10.

In fractions, 1 ÷ 3 is 1/3. Strict fractions are used even in calculations that continue directly. Constant calculations can be repeated by repeating the equals sign.

Percentage increases and decreases are displayed below the formula. You can choose automatic or 0-4 decimal places.

■ GT - Memory and History
GT, M+, M-, and MR can be used in portrait mode. They don't disappear in AC mode and remain even when the app is closed.

Add notes to your history and search by numbers or words. "1,980", "1980", and "１９８０" will match the same amount. Pin frequently used formulas and open them in history to recalculate.

■ Shikical Plus
Plus allows you to view and search all history entries, export to CSV, use four themes (natural, black, indigo, young bamboo), and expand the number of pinned items. Even older history entries exceeding 100 in the normal display are saved without being deleted.

■ Use on Your Own Device
There are no ads or app-specific accounts. Calculation formulas, records, and notes are saved on your device and not sent to the developer. Google Play Billing processes purchase information and technical diagnostics.

The sample mode in settings allows you to try operations without affecting normal formulas, records, or purchase status.

Supports dark mode, font size adjustment, text-to-speech, and external keyboards.

Privacy Policy: https://stackworksdev.github.io/shiki-calc-android/privacy.html
Terms of Use: https://stackworksdev.github.io/shiki-calc-android/terms.html
Support: https://stackworksdev.github.io/shiki-calc-android/support.html

What’s new

Android版の初回リリースです。
式の数字をタップして修正、時間・消費税・利益・源泉計算、GTとメモリー、メモ付き履歴に対応しました。
設定の見本モードで、通常の記録と購入状態を保ったままPlusの機能を試せます。