Browse the tools
AI Prompt Optimizer
Improve your AI prompts: strip filler, save tokens, and add role, format and constraints with a large role library.
Percentage Calculator
Work out percentages, increase, decrease and the difference between two numbers instantly, with a chart.
Password Generator
Create strong random passwords or passphrases in your browser, with a strength meter and crack-time estimate.
ROAS Calculator
Calculate return on ad spend, ROI, cost per acquisition and your break-even ROAS, with a chart.
ROI Calculator
Calculate return on investment, net profit and the annualised return for any project.
UTM Link Builder
Build correctly tagged UTM campaign URLs to track traffic sources in Google Analytics.
Character & Word Counter
Count characters, words, sentences and reading time live, with social and ad platform limits tracked.
Arabic RTL Text Fixer
Fix scrambled numbers, punctuation and Latin words in Arabic ad copy before pasting into Meta, Google or TikTok Ads.
VAT Calculator
Add VAT to an amount or extract it from a VAT-inclusive price at any rate, with a full breakdown.
Discount Calculator
Find the sale price and your saving, and work out stacked discounts correctly.
Age Calculator
Calculate your exact age in years, months and days, plus days lived and time to your next birthday.
Working Days & Leave Calculator
Count working days between two dates, excluding weekends and public holidays.
BMI Calculator
Compute your body mass index and see your health category.
Coming soonUnit Converter
Convert length, weight, temperature, area and volume units instantly.
Why Manarty?
Genuinely fast
Built with no external libraries, so pages open instantly even on slow mobile connections.
Fully private
Every calculation happens on your own device. Your numbers are never sent to a server or stored.
Mobile-first
A layout designed for phones first, that scales smoothly up to any screen size.
Arabic & English
Every tool is fully available in both languages, with complete right-to-left support.