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Use our Transferrin Saturation Calculator to find your TSAT from serum iron and TIBC. Learn the formula, steps, and what your result may mean.
| Mode | Formula | Notes |
|---|---|---|
| Serum Iron + TIBC | TSAT (%) = (Serum Iron / TIBC) × 100 | Primary mode; use when TIBC is reported directly |
| Serum Iron + UIBC | TIBC = Serum Iron + UIBC; TSAT (%) = [Serum Iron / (Serum Iron + UIBC)] × 100 | Use when only UIBC is reported |
| Unit Conversion | 1 µg/dL = 0.1791 µmol/L | Both inputs must use the same unit; the ratio is unchanged either way |
Use our Transferrin Saturation Calculator to find your TSAT in seconds. Enter your serum iron and TIBC from your blood test. The tool will show your result as a percent.
TSAT tells you how much of the iron-carrying protein in your blood has iron bound to it. Think of this protein as a bus. Iron fills its seats. TSAT tells you how many seats are full.
Transferrin Saturation (%) = (Serum Iron ÷ TIBC) × 100
Serum iron is the iron found in your blood. TIBC tells how much iron your blood can bind. Both values must use the same unit, such as µg/dL or µmol/L. If not, change them to the same unit first.
Divide serum iron by TIBC. Then multiply the answer by 100. The result is your TSAT percent.
Enter serum iron. Copy the value from your blood test.
Enter TIBC. Use the TIBC value from the same test.
Check the units. Both values must use the same unit.
Click Calculate. The tool will work out your TSAT.
Read your result. Check the percent and your lab's own range.
If your report shows UIBC, add serum iron and UIBC to get TIBC. Then use the main formula. Use the same unit for both values.
Say your serum iron is 90 µg/dL and your TIBC is 300 µg/dL.
Step 1: 90 ÷ 300 = 0.30
Step 2: 0.30 × 100 = 30%
Your TSAT is 30%. This means 30% of the iron-binding capacity is in use.
Many labs use a range near 20% to 45% for adults. The right range can vary by lab and person. Check the range on your own report.
Yes, 55% is above many common adult ranges. It does not prove that you have too much iron. Your doctor may check other blood tests or ask you to test again.
An 8% result is low for most adults. It may mean that your body has too little iron to use. Ask your health care provider what your result means.
Our Transferrin Saturation Calculator gives you a quick TSAT result from serum iron and TIBC. Use values from the same lab report and check the units. The result is one part of the full picture, not a diagnosis.
TSAT means transferrin saturation. It shows the share of iron-binding capacity used by iron in your blood.
Yes, if you have UIBC. Add serum iron and UIBC to get TIBC. Then use the main formula.
No. TSAT alone cannot tell if you have anemia or iron overload. A health care provider may need other tests.
No. It does the math only. Ask your health care provider to explain your result.