Free
Discount & Savings Calculator
Calculate sale price, stacked discounts, coupon savings, sales tax, and the effective discount before you buy.
- Stacked discounts
- Coupon amount
- Sales tax
Free buyer tools
Make the numbers easier before you buy.
Compare prices, calculate real savings, and understand recurring costs with private tools built for shoppers and small businesses.
- No sign-up required
- Calculations stay in your browser
- Mobile friendly
Quick calculators
Choose the decision you want to make.
Each calculator has its own guide, examples, and shareable URL.
Free
Unit Price Calculator
Compare two products across weight, US or imperial liquid volume, metric volume, or item counts.
- Mass conversion
- US and imperial volume conversion
- Item comparison
Free
Subscription Cost Calculator
Add recurring subscriptions and calculate their combined monthly, annual, and five-year cost in your preferred currency.
- Multiple subscriptions
- Flexible billing cycles
- Annual total
Built for real decisions
Simple inputs. Clear answers. No account.
Private by design
Numbers are calculated on your device and are not submitted to HelpingDude.
Multi-currency ready
Supports USD, CAD, GBP, EUR, AUD, NZD, and INR.
Made to compare
Results explain the difference instead of showing a number without context.
Creator utilities moved
Visit YouTube Tool Hub
Looking for YouTube tools?
YouTube-specific utilities now live together on YouTube Tool Hub, including the Comment Downloader, Thumbnail Downloader, Transcript Toolkit, and analytics tools.