Blood Type Calculator
Predict possible blood types of children from the parents', or infer plausible parent combinations from a child's type. Covers ABO and Rh systems. Fully processed in your browser.
Runs in your browser
Real-time
Known types
Direction
Computed from ABO allele combinations with AA/AO treated as equally likely; AO is more common in reality, so true odds differ slightly.
Possible child types
| Genotype | Share |
|---|
About this tool
Predict possible blood types of children from the parents', or infer plausible parent combinations from a child's type. Covers ABO and Rh systems. Fully processed in your browser.
How to use
- Fill in the input box above, or click "Fill sample" to try it instantly
- Adjust the options as needed — results update as you type
- Click "Run" to get the result, then copy or export it in one click
Tips
- Runs entirely in your browser — your data never leaves the device
- Completely free, no registration, no usage limits
- Most tools compute in real time as you type