Estimated Blood Volume Calculator
Nadler blood volume in liters and ml by sex and size.
What it does
Blood volume sets the context for donations, draws, and fluid plans. Adults carry several liters, scaled to body size by tested equations rather than flat per pound rules. A quick estimate frames what a unit means.
The tool above applies Nadler prediction. A man at 180 cm and 80 kg lands at 5.32 L, which is 5319 ml, beside a 0.5 L donation note. The imperial match is 70 in with 176 lb toward 5.24 L.
Sex changes the constants because body composition differs. Male and female equations share the cubed height plus weight shape with their own fitted numbers from the 1962 study. Height drives the cubic term while weight adjusts linearly.
Estimates inform but never prescribe. Labs, bleeding, fluids, and pregnancy move real volumes around the prediction. Donation staff and clinicians own eligibility and transfusion calls.
How to use
- Pick metric (cm, kg) or imperial (in, lb).
- Pick male or female formula.
- Enter height: 180 cm or 70 in.
- Enter weight: 80 kg or 176 lb.
- Read liters first.
- Read ml and the donation note.
Formula
- H
- Height in meters.
- W
- Weight in kilograms.
- k1, k2, k3
- Sex specific constants from Nadler 1962.
Nadler prediction uses height cubed plus weight with sex specific constants, returning liters. A 150 to 180 lb adult carries about 1.2 to 1.5 gallons, near ten units, which matches mid range outputs. Whole blood donations run about 0.5 L beside these totals.
Worked example
Example: man 180 cm, 80 kg
Metric defaults: male, 180 cm, 80 kg. These are also the default values, so the page opens on this answer.
- Man, 180 cm, 80 kg.
- Height cubed: 1.80 x 1.80 x 1.80 = 5.832.
- First term: 0.3669 x 5.832 = 2.1398.
- Second term: 0.03219 x 80 = 2.5752.
- Add constant: 2.1398 + 2.5752 + 0.6041 = 5.3191.
- Round: 5.32 L, which is 5319 ml.
- Tool shows 5.32 L with 5319 ml and a 0.5 L donation note.
- Imperial match: 70 in with 176 lb gives 5.24 L.
Reference table
| Person | Liters | ml |
|---|---|---|
| Man 175 cm, 70 kg | 4.82 | 4824 |
| Man 190 cm, 95 kg | 6.18 | 6179 |
| Woman 160 cm, 55 kg | 3.46 | 3461 |
| Woman 170 cm, 70 kg | 4.25 | 4248 |
Limits
- Estimate only, not clinical guidance.
- Ignores fluids, bleeding, and pregnancy.
- Uses binary sex formulas.
- Donation rules vary by agency.
Common mistakes
- Using flat per pound rules.
- Mixing cm with inches.
- Expecting donation math to match exactly.
- Applying male constants to women.
- Reading estimates as orders.
Try it yourself
Quick checks. Answers sit tucked under each question.
Woman 165 cm, 60 kg?
3.77 L with 3768 ml.
Woman 65 in, 132 lb imperial?
3.77 L with 3766 ml.
Questions
How is male volume found?
Apply Nadler with height in meters and weight in kg. Here 0.3669 x 5.832 + 0.03219 x 80 + 0.6041 = 5.32 L.
Female formula?
Women use 0.3561, 0.03308, and 0.1833 with the same height cubed plus weight shape.
Liters to ml?
Multiply liters by 1000. Here 5.32 x 1000 = 5319 ml after rounding.
Donation size?
About 0.5 L per whole blood donation.
Does it guide transfusion?
No. Anesthesia, fluids, and bleeding shift real volumes; clinicians decide transfusion needs.
Imperial version?
Yes: 70 in with 176 lb converts to the same math toward 5.24 L.