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T3 T4 Ratio Calculator helps you quickly find accurate thyroid hormone ratios using lab values. Easy, fast, and reliable tool for understanding thyroid health.
Your thyroid runs your body like a tiny power station. It keeps your energy up, your weight steady, and your mind sharp. Two key hormones do this job. They’re called T3 and T4. When these two fall out of line, your body feels it. That’s why the T3 T4 Ratio matters.
We built a T3 T4 Ratio Calculator to help you check this balance in seconds. It’s simple. It’s fast. It makes your thyroid report easy to understand.
The T3 T4 Ratio shows how well your body converts T4 into T3. T4 is the storage form. T3 is the active form. Your body turns T4 into T3 every day.
A higher ratio tells you your body is converting more T4 into T3. A lower ratio may mean slow conversion or thyroid stress.
The ratio helps you get a clear picture of your thyroid activity. Doctors use it to check for Graves’ disease, thyroiditis, and conversion issues. When the ratio shifts too much, it can point to a bigger issue under the hood.
T3 and T4 values come in different units. So we convert them into one base unit first.
The classic formula is simple.
T3 T4 Ratio = T3 (ng/dL) ÷ T4 (µg/dL)
This formula is used in clinical tests to check thyroid function.
Some labs give free hormone values instead of total.
Here’s the formula for free hormones.
Free T3 T4 Ratio = FT3 (pmol/L) ÷ FT4 (pmol/L)
It’s the same method. Only the units change.
A normal ratio shows that your thyroid is moving T4 into T3 at a steady pace. Most healthy ranges fall into a simple pattern.
For total hormones, the typical range is around twenty. If the ratio drops under twenty, the body may face a drop in conversion. If the ratio rises above twenty, the body may push more T3 than usual.
For free hormones, most people fall between zero point three and zero point four. It’s a small number, but it tells a big story.
Graves’ disease speeds up your thyroid. When this happens, T3 often rises faster than T4.
This makes the ratio go up.
This isn’t a diagnosis. But it offers a strong clue.
Normal values change a little across labs. But most ranges stay close.
These numbers help you see how your own result fits into the picture.
Using the calculator feels like a walk in the park. You pick your test type. You add your T3 value and unit. Then you add your T4 value and unit. The calculator converts everything for you. It uses medical conversion factors.
You tap the button. You get the ratio. You also get the full steps. This helps you see how the math works. You’ll even get a clinical note. It gives you a short and clear idea of what the ratio may mean.
Your thyroid deserves care. Small shifts in T3 or T4 can change how you feel. The T3 T4 Ratio Calculator makes this easy to track. It’s fast. It’s clear. It’s built to help you stay aware of your thyroid health. Use it when you get your lab report. Use it when you want peace of mind. It gives you the insight you need in seconds.
It shows how well your body turns T4 into T3. This tells you a lot about thyroid activity.
A high ratio can suggest it. But you’ll still need a full medical check.
A very low ratio may show weak conversion or thyroiditis. It’s best to talk to your doctor.
Yes. It uses standard medical formulas and conversion factors.
Yes. The calculator supports all common lab units.