Sodium mg to mmol: divide milligrams of sodium by 23 (22.99). 1 mmol of sodium = 23 mg = 1 mEq. So 300 mg of sodium = 13.0 mmol, 1 g of sodium = 43.5 mmol, and 100 mmol of sodium = 2,299 mg. For blood tests, sodium mg/dL ÷ 2.299 = mmol/L.
Sodium (Na⁺) Calculator
Conversion settings
The calculator converts blood sodium (mg/dL ↔ mmol/L). For sodium in food, supplements and salt, use the charts below.
Sodium Conversion Factors (mg, mmol, mEq, g, Salt)
| Convert sodium | Formula | Example |
|---|---|---|
| mg to mmol | mmol = mg ÷ 22.99 | 480 mg = 20.9 mmol |
| mmol to mg | mg = mmol × 22.99 | 40 mmol = 920 mg |
| g to mmol | mmol = g × 43.5 | 1 g = 43.5 mmol |
| mmol to g | g = mmol × 0.023 | 100 mmol = 2.30 g |
| mmol to mEq | mEq = mmol (charge 1) | 20 mmol = 20 mEq |
| sodium to salt (NaCl) | salt = sodium × 2.54 | 200 mg sodium = 0.51 g salt |
| salt to sodium | sodium = salt × 0.393 | 1 g salt = 393 mg sodium |
| mg/dL to mmol/L (blood) | mmol/L = mg/dL ÷ 2.299 | 322 mg/dL = 140.1 mmol/L |
Sodium mg to mmol Chart (with % Daily Value and Salt)
Nutrition labels list sodium in mg and as a percentage of the Daily Value (DV), which is 2,300 mg in the US. This chart converts sodium mg to mmol and shows the % DV and the equivalent amount of salt.
| Sodium (mg) | Sodium (mmol) | % Daily Value | Equivalent salt |
|---|---|---|---|
| 23 mg | 1.0 mmol | 1% | 0.06 g |
| 50 mg | 2.2 mmol | 2% | 0.13 g |
| 100 mg | 4.3 mmol | 4% | 0.25 g |
| 140 mg | 6.1 mmol | 6% | 0.36 g |
| 190 mg | 8.3 mmol | 8% | 0.48 g |
| 200 mg | 8.7 mmol | 9% | 0.51 g |
| 230 mg | 10.0 mmol | 10% | 0.58 g |
| 300 mg | 13.0 mmol | 13% | 0.76 g |
| 400 mg | 17.4 mmol | 17% | 1.02 g |
| 480 mg | 20.9 mmol | 21% | 1.22 g |
| 500 mg | 21.7 mmol | 22% | 1.27 g |
| 600 mg | 26.1 mmol | 26% | 1.53 g |
| 700 mg | 30.4 mmol | 30% | 1.78 g |
| 800 mg | 34.8 mmol | 35% | 2.03 g |
| 1,000 mg | 43.5 mmol | 43% | 2.54 g |
| 1,200 mg | 52.2 mmol | 52% | 3.05 g |
| 1,500 mg | 65.2 mmol | 65% | 3.81 g |
| 2,000 mg | 87.0 mmol | 87% | 5.08 g |
| 2,300 mg | 100.0 mmol | 100% | 5.85 g |
| 3,000 mg | 130.5 mmol | 130% | 7.63 g |
| 4,000 mg | 174.0 mmol | 174% | 10.17 g |
| 5,000 mg | 217.5 mmol | 217% | 12.71 g |
How much is 190 mg of sodium? About 8.3 mmol, or 8% of the daily value. How much is 480 mg of sodium? About 20.9 mmol, or 21% of the daily value.
Sodium mmol to mg Chart
| Sodium (mmol = mEq) | Sodium (mg) | Sodium (g) | Equivalent salt (g) |
|---|---|---|---|
| 1 mmol (1 mEq) | 23 mg | 0.02 g | 0.1 g |
| 2 mmol (2 mEq) | 46 mg | 0.05 g | 0.1 g |
| 5 mmol (5 mEq) | 115 mg | 0.11 g | 0.3 g |
| 10 mmol (10 mEq) | 230 mg | 0.23 g | 0.6 g |
| 17.1 mmol (17.1 mEq) | 393 mg | 0.39 g | 1.0 g |
| 20 mmol (20 mEq) | 460 mg | 0.46 g | 1.2 g |
| 40 mmol (40 mEq) | 920 mg | 0.92 g | 2.3 g |
| 50 mmol (50 mEq) | 1,150 mg | 1.15 g | 2.9 g |
| 65 mmol (65 mEq) | 1,494 mg | 1.49 g | 3.8 g |
| 87 mmol (87 mEq) | 2,000 mg | 2.00 g | 5.1 g |
| 100 mmol (100 mEq) | 2,299 mg | 2.30 g | 5.8 g |
| 150 mmol (150 mEq) | 3,449 mg | 3.45 g | 8.8 g |
| 200 mmol (200 mEq) | 4,598 mg | 4.60 g | 11.7 g |
Convert Salt to Sodium (and Sodium to Salt)
Salt is sodium chloride (NaCl). Only about 39% of salt by weight is sodium. To convert mg of sodium to salt, multiply by 2.54; to convert salt to sodium, multiply by 0.393.
| Salt (NaCl) | Sodium (mg) | Sodium (mmol) |
|---|---|---|
| 0.5 g salt | 197 mg | 8.6 mmol |
| 1 g salt | 393 mg | 17.1 mmol |
| 1.5 g salt | 590 mg | 25.7 mmol |
| 2 g salt | 787 mg | 34.2 mmol |
| 2.5 g salt | 983 mg | 42.8 mmol |
| 3 g salt | 1,180 mg | 51.3 mmol |
| 4 g salt | 1,574 mg | 68.4 mmol |
| 5 g salt | 1,967 mg | 85.6 mmol |
| 6 g salt | 2,360 mg | 102.7 mmol |
| 10 g salt | 3,934 mg | 171.1 mmol |
The WHO recommends less than 5 g of salt a day, which is about 2,000 mg (87 mmol) of sodium.
Sodium mmol to mEq
Sodium (Na⁺) has a single positive charge, so 1 mmol = 1 mEq and blood sodium in mmol/L is the same number as mEq/L. A serum sodium of 140 mmol/L is 140 mEq/L, and a urine sodium result converts the same way.
Blood Sodium: mg/dL to mmol/L
Blood (serum) sodium is almost always reported in mmol/L, usually labelled Na. If you have a value in mg/dL, divide by 2.299 to get mmol/L. A normal sodium of 135–145 mmol/L equals about 310–333 mg/dL, so a figure such as “sodium 125 mg/dL” is almost certainly a mmol/L result with the wrong unit. For the reverse, use the sodium mmol/L to mg/dL converter.
| Sodium (mg/dL) | Sodium (mmol/L = mEq/L) |
|---|---|
| 280 mg/dL | 121.8 mmol/L |
| 290 mg/dL | 126.1 mmol/L |
| 300 mg/dL | 130.5 mmol/L |
| 310 mg/dL | 134.8 mmol/L |
| 315 mg/dL | 137.0 mmol/L |
| 320 mg/dL | 139.2 mmol/L |
| 322 mg/dL | 140.1 mmol/L |
| 325 mg/dL | 141.4 mmol/L |
| 330 mg/dL | 143.5 mmol/L |
| 333 mg/dL | 144.8 mmol/L |
| 340 mg/dL | 147.9 mmol/L |
| 345 mg/dL | 150.1 mmol/L |
| 350 mg/dL | 152.2 mmol/L |
Sodium Concentration in Human Blood (g/L or mmol/L)
Normal blood sodium is 135–145 mmol/L, which is about 3.1–3.3 g/L (140 mmol/L = 3.22 g/L). Readings such as 138, 140 or 141 mmol/L are in the normal range; below 135 mmol/L is low (hyponatremia) and above 145 mmol/L is high (hypernatremia). In French, 1 g de sodium = 43.5 mmol.
Frequently Asked Questions
How do I convert sodium mg to mmol?
Divide the mg value by 23. For example, 300 mg ÷ 23 = 13.0 mmol of sodium.
How many mg is 1 mmol of sodium?
1 mmol of sodium = 22.99 mg, usually rounded to 23 mg.
How many mmol is 1 g of sodium?
1 g (1,000 mg) of sodium = 43.5 mmol.
How much is 100 mmol of sodium in mg?
100 mmol × 23 = 2,299 mg of sodium, or about 5.8 g of salt.
Is sodium mmol the same as mEq?
Yes. Sodium has a charge of +1, so 1 mmol = 1 mEq and mmol/L = mEq/L.
How do I convert sodium mg to salt?
Multiply by 2.54. For example, 700 mg of sodium = 1.8 g of salt.
What is 300 mg/dL sodium in mmol/L?
300 mg/dL ÷ 2.299 = 130.5 mmol/L.
Related: potassium mg to mmol and all electrolyte and mineral conversions.