PrefixCalc vs Gratuity Lab

This calculator supports Metric‑prefix such as kilo and giga. The calculator supports quetta (10^30) and quecto (10^-30), which were added in 2022. Main Functions ・Support for arithmetic operations (+ - ×÷) ・Results converted to Japanese numerals for display ・Delete one character at a time with the "DEL" button 　Press and hold to delete all ・Press and hold to copy calculation formulas and results 　English (Short scale, Long scale) and 　Chinese numerals can also be selected. ・Calculations that include prefixes such as 2M+1k, 2M×1μ, etc. Note: ・Very large numbers that exceed 200 digits may be rounded off for display and calculation purposes. 　Please note this when precision is required. ・Short scale and Long scale are currently supported up to 10^198. ・Kanji notation is supported up to 10^72. 　If it is greater than the number, it will be displayed in Arabic numerals.

Know what you’re tipping on. Gratuity Lab brings receipt scanning, amount verification and bill splitting into one clear workflow. SCAN, THEN CHECK • Scan with the camera or choose receipt photos. • Recognize text on your device. • Compare detected amounts with the original receipt and zoom in on the evidence. • Review uncertain values and detected charges before using the numbers. • Try a sample receipt without camera or photo access. SPLIT WITH CONFIDENCE • Choose pre-tax or after-tax tipping. • Use custom percentages or your own quick-tip presets. • Divide a bill among up to 100 people. • See how any remaining cents are allocated when equal shares do not add up exactly. • Keep exact amounts or round the total or each person’s share. KEEP THE DETAILS • Save bills and receipt images in local history. • Search by merchant, add notes and reopen a calculation. • Share a calculation summary. READY FOR YOUR ROUTINE Choose currencies and regional number formats. Use light or dark appearance on iPhone and iPad. Choose from 50 interface language and regional editions. No account is required. Calculations, receipt recognition and saved history work on your device. Recognition results should always be checked against the receipt. Detected service charges and included gratuities are shown for review and are not automatically added to your tip calculation. The app includes banner advertising, with consent and privacy options where required. SAVE YOUR WAY Choose app history, Photos, both, or not now. Remember your choice for next time and change it in Settings. Receipt recognition language support varies by device and iOS version; unsupported languages can be entered manually. Currency selection formats amounts; it does not convert exchange rates.