What is a normal GFR?

About 100-130 mL/min/1.73m² in men and 90-120 in women under 40, declining progressively after age 40.

Why do the formulas disagree?

Each was fitted to different study populations; creatinine-based estimates are also affected by muscle mass and can overestimate clearance by 10-20%.

Which formula is used most?

CKD-EPI 2009 is the most widely adopted for routine eGFR reporting; MDRD remains common in older labs.

GFR Calculator

Estimates kidney function (eGFR) from serum creatinine, age, gender and race using the CKD-EPI equation, with the MDRD and Mayo Quadratic results for comparison, classified by CKD stage.

#gfr calculator#egfr#ckd-epi#mdrd#kidney function

Live calculate

Presets

Serum Creatinine (SCr)

mg/dL

Age

years

Gender

MaleFemale

Race

BlackNot Black

Live mode: results update as you type.

eGFR (CKD-EPI 2009)

99 mL/min/1.73m²

Normal / CKD1 · GFR above 60 is usually adequate

CKD-EPI: 99 mL/min/1.73m²
MDRD (IDMS): 89 mL/min/1.73m²
Mayo Quadratic: 120 mL/min/1.73m²
CKD stage: Normal / CKD1
Inputs: SCr 0.90 mg/dL · male · 50 yr

Chronic Kidney Disease stages

99.2mL/min/1.73m²

Normal (CKD1)

Kidney failure (CKD5)< 15Severe (CKD4)15–30Moderate (CKD3)30–60Mild (CKD2)60–90Normal (CKD1)90+

Formula comparison

Formula	eGFR (mL/min/1.73m²)
CKD-EPI 2009	99
MDRD study (IDMS-traceable)	89
Mayo Quadratic	120

Population mean eGFR: 20-29 yr 116 · 30-39 yr 107 · 40-49 yr 99 · 50-59 yr 93 · 60-69 yr 85 · 70+ yr 75.

eGFR is interpreted alongside urine protein tests and trends over time — a single value does not diagnose kidney disease. Estimates for informational purposes only — not medical advice.

Most useful next

Formula

CKD-EPI: eGFR = 141 × (SCr/κ)^α × 0.993^age × 1.018 [female] × 1.159 [Black], κ = 0.9 (male) / 0.7 (female), α = −0.411 (male) / −0.329 (female) below κ, else −1.209 · MDRD: 175 × SCr^−1.154 × age^−0.203 × 0.742 [female] × 1.212 [Black]

• Pick the κ threshold and exponent for gender; use α below κ and −1.209 at or above it.
• Multiply the base 141 by the creatinine ratio power and the 0.993-per-year age decay.
• Apply the female (1.018) and Black (1.159) multipliers as applicable.

Pro tips

• A GFR above 60 with no proteinuria is usually adequate for most patients.
• GFR naturally declines with age — compare against the population mean for your age band.

FAQ

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GFR Calculator

Estimates kidney function (eGFR) from serum creatinine, age, gender and race using the CKD-EPI equation, with the MDRD and Mayo Quadratic results for comparison, classified by CKD stage.

#gfr calculator#egfr#ckd-epi#mdrd#kidney function

Live calculate

Presets

Serum Creatinine (SCr)

mg/dL

Age

years

Gender

MaleFemale

Race

BlackNot Black

Live mode: results update as you type.

eGFR (CKD-EPI 2009)

99 mL/min/1.73m²

Normal / CKD1 · GFR above 60 is usually adequate

CKD-EPI: 99 mL/min/1.73m²
MDRD (IDMS): 89 mL/min/1.73m²
Mayo Quadratic: 120 mL/min/1.73m²
CKD stage: Normal / CKD1
Inputs: SCr 0.90 mg/dL · male · 50 yr

Chronic Kidney Disease stages

99.2mL/min/1.73m²

Normal (CKD1)

Kidney failure (CKD5)< 15Severe (CKD4)15–30Moderate (CKD3)30–60Mild (CKD2)60–90Normal (CKD1)90+

Formula comparison

Formula	eGFR (mL/min/1.73m²)
CKD-EPI 2009	99
MDRD study (IDMS-traceable)	89
Mayo Quadratic	120

Population mean eGFR: 20-29 yr 116 · 30-39 yr 107 · 40-49 yr 99 · 50-59 yr 93 · 60-69 yr 85 · 70+ yr 75.

eGFR is interpreted alongside urine protein tests and trends over time — a single value does not diagnose kidney disease. Estimates for informational purposes only — not medical advice.

Most useful next

Formula

• Pick the κ threshold and exponent for gender; use α below κ and −1.209 at or above it.
• Multiply the base 141 by the creatinine ratio power and the 0.993-per-year age decay.
• Apply the female (1.018) and Black (1.159) multipliers as applicable.

Pro tips

• A GFR above 60 with no proteinuria is usually adequate for most patients.
• GFR naturally declines with age — compare against the population mean for your age band.

FAQ

Related Calculators

More Health tools you might need.