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Everyday utilities
Essential everyday calculation tools
Quick, reliable utilities for percentages, exact dates, shared bills, and scale proportions without complex spreadsheets.
Most popular
Percentage calculator
Calculate percentage change, markups, discounts, and proportions for daily transactions.
Key readoutChange, off & total
Precise
Age calculator
Determine exact chronological age down to years, months, weeks, and total days lived.
Key readoutYears, months & days
Work & calendar
Date duration calculator
Count working business days, holidays, and total calendar duration between two dates.
Key readoutBusiness day count
Bill split
Tip calculator
Split restaurant bills evenly across your party and adjust customary service percentages.
Key readoutPer-person split
Proportions
Unit ratios calculator
Simplify aspect ratios, recipe proportions, and proportional scaling factors in seconds.
Key readoutAspect & scale ratios
All calculations run locally on your device with instant mathematical accuracy and zero stored inputs.
Engineering utility
Multi-mode percentage engine
Calculate percentage changes, price markdowns, and proportional ratios with real-time mathematical precision.
Interactive percentage calculator
Compute additions, subtractions, and growth percentages on any baseline number.
Live computation readout Real-time
Computed final outcome
180
Baseline 150 + 20%
Difference amount (Delta)+30.00
Effective multiplier× 1.2000
Applied shift+20% growth
Applied formula
Final = Base × (1 + 20/100)
Calculated step: 150 × 1.20 = 180.00
Frequently asked percentage questions
Clear breakdowns of foundational formulas and computational steps.