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ABI Calculator

ABI Calculator

Ankle-Brachial Index for Peripheral Artery Disease Assessment

Medical Tool: This calculator is for educational purposes. Always consult healthcare professionals for diagnosis and treatment.

The ABI test should be performed by trained medical personnel.

Enter Blood Pressure Measurements

Arm Measurements (Systolic)

mmHg
mmHg

Ankle Measurements (Systolic)

mmHg
mmHg
ABI Interpretation Guide
ABI < 0.4 Severe PAD
  • Severe arterial disease
  • High risk of critical limb ischemia
  • Urgent vascular referral needed
  • May have rest pain or tissue loss
ABI 0.4 - 0.7 Moderate PAD
  • Moderate arterial disease
  • Likely to have claudication symptoms
  • Vascular specialist consultation recommended
  • Risk factor modification crucial
ABI 0.7 - 0.9 Mild PAD
  • Mild arterial disease
  • May have mild claudication
  • Exercise therapy beneficial
  • Monitor and manage risk factors
ABI 0.9 - 1.3 Normal
  • Normal arterial flow
  • No significant PAD
  • Continue healthy lifestyle
  • Regular monitoring if risk factors present
ABI > 1.3 Non-compressible
  • Calcified, stiff arteries
  • Common in diabetes or kidney disease
  • ABI may be unreliable
  • Consider toe-brachial index (TBI)
PAD Risk Factors

Smoking

Most significant modifiable risk factor

Diabetes

Increases PAD risk 2-4 times

High Blood Pressure

Damages artery walls over time

High Cholesterol

Contributes to plaque buildup

Age Over 50

Risk increases with age

Family History

Genetic predisposition to PAD

Previous Measurements

No previous measurements

01
01
PAD Detection

Calculates Ankle-Brachial Index from simple blood pressure measurements. Identifies peripheral artery disease with colour-coded severity indicators from normal to severe.

02
02
Dual Leg Assessment

Compares both legs independently to detect asymmetric disease patterns. Visual markers on an intuitive scale show exactly where each leg's ABI falls within medical ranges.

03
03
Clinical Interpretation

Provides detailed medical guidance for five ABI ranges with specific recommendations. From urgent vascular referral needs to routine monitoring advice based on established guidelines.

04
04
Measurement History

Stores up to 10 previous tests with complete blood pressure readings and ABI results. Track disease progression or treatment effectiveness over time with timestamped records.

Ankle-Brachial Index

Detect Peripheral Artery Disease Early with Our ABI Calculator

Input systolic blood pressure readings from both arms and ankles; the tool instantly calculates your Ankle-Brachial Index using the medically-validated formula trusted by vascular specialists worldwide. The visual results display shows precisely where each leg falls on the PAD severity spectrum—from green (normal 0.9-1.3) through yellow and orange to red zones indicating moderate to severe disease.

 

Clear medical interpretations explain what your numbers mean, whether you need urgent specialist referral or can manage with lifestyle modifications. Essential for anyone over 50, diabetics, or those with cardiovascular risk factors, this calculator helps identify reduced blood flow to the legs before serious complications develop. The saved history feature allows you to monitor changes between GP visits, providing valuable data for healthcare decisions whilst maintaining complete privacy on your device.

real testimonials

What They
Say About Our
ABI Tool?

— Dorothy Pemberton
"My vascular consultant showed me how to do ABI measurements at home after my PAD diagnosis. This tool makes it so much simpler than working out the maths myself. The colour-coded results are perfect - I can see straight away if I'm in the green zone or creeping towards orange. Been tracking my readings monthly since starting walking therapy and I'm chuffed to see improvement from 0.72 to 0.85!"
— Dorothy Pemberton
Bristol
— Malcolm Richards
"This calculator helped me understand what the numbers meant when the practice nurse did my ABI test. Only criticism is that it took me a moment to work out which ankle reading to use - perhaps clearer instructions about posterior tibial vs dorsalis pedis would help? Still, the interpretations are spot-on, and it correctly identified my moderate PAD (0.65 both legs)."
— Malcolm Richards
Leeds
— Sylvia Thornton
"After my husband's leg amputation due to undiagnosed PAD, I've been paranoid about my own circulation. The district nurse taught me to use a doppler device and this calculator makes perfect sense of the readings. The visual scale is genius - even with my cataracts, I can see where the markers sit."
— Sylvia Thornton
Southampton
— Geoffrey Hutchins
"As a retired GP myself, I appreciate the accuracy of this calculator. Diagnosed with PAD three years ago, I monitor my ABI regularly. The asymmetry detection is particularly clever - it flagged up a 0.2 difference between my legs that warranted further investigation. Turned out I had significant stenosis on the left side. The clinical recommendations align perfectly with NICE guidelines."
— Geoffrey Hutchins
Edinburgh
— Gladys Fletcher
"Marvellous calculator that possibly saved my leg! Was getting terrible pain in my calf, which I'd dismissed as old age. My daughter (a nurse) did my blood pressures and we used this calculator - shocked to see 0.38 on my right leg (severe PAD)! The urgent referral recommendation prompted immediate action. Within a week, I'd had emergency vascular surgery."
— Gladys Fletcher
Birmingham