offlinewebtools.com — free, watermark-free browser tools that stay on your device with nothing uploading to our servers
Blood-Type Matcher & Donation Rule Checker
Match donor and recipient blood types, and check age, weight, and donation-interval safety rules before planning a donation.
What this tool does
Blood-Type Matcher & Donation Rule Checker helps you match donor and recipient blood types, and check age, weight, and donation-interval safety rules before planning a donation.
What you get
Blood-Type Matcher & Donation Rule Checker produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.
Try this first
- Start by entering donor blood type and then complete the remaining inputs from left to right.
- Need clarification? Use each field hint below for what each input expects.
- Press the action button when your values are complete to run the calculation.
Use full numbers for timeline values unless the tool explicitly supports decimals.
Select one weight unit option that matches your assumptions.
Recent inputs
Return to your last calculator, converter, or text tool inputs with one click.
Enable analytics consent to use persistent recent-input history.
No recent inputs yet.
Report a bug
If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.