Goal Attainment Score Calculator
ANA›Life Services Authority›National Calculator Authority›Goal Attainment Score Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Goal Attainment Score Calculator
Goal Attainment Scaling (GAS) calculates a standardized T-score from individualized patient or program goals, each weighted by importance and difficulty. A T-score of 50 means goals were met exactly as expected.
Enter up to 5 goals. For each goal, select the attainment level achieved and assign a weight (importance).
#### Goal 1
Attainment Level Achieved
-- Select -- -2: Much less than expected -1: Somewhat less than expected 0: Expected outcome (goal met) 1: Somewhat more than expected 2: Much more than expected
Weight / Importance (1–4)
#### Goal 2 (optional)
Attainment Level Achieved
-- Not used -- -2: Much less than expected -1: Somewhat less than expected 0: Expected outcome (goal met) 1: Somewhat more than expected 2: Much more than expected
Weight / Importance (1–4)
#### Goal 3 (optional)
Attainment Level Achieved
-- Not used -- -2: Much less than expected -1: Somewhat less than expected 0: Expected outcome (goal met) 1: Somewhat more than expected 2: Much more than expected
Weight / Importance (1–4)
#### Goal 4 (optional)
Attainment Level Achieved
-- Not used -- -2: Much less than expected -1: Somewhat less than expected 0: Expected outcome (goal met) 1: Somewhat more than expected 2: Much more than expected
Weight / Importance (1–4)
#### Goal 5 (optional)
Attainment Level Achieved
-- Not used -- -2: Much less than expected -1: Somewhat less than expected 0: Expected outcome (goal met) 1: Somewhat more than expected 2: Much more than expected
Weight / Importance (1–4)
Inter-goal Correlation (ρ) — default 0.30
Typical value is 0.30 (Kiresuk & Sherman, 1968). Range: 0–0.99.
Calculate GAS T-Score
function goaCalc() { var resultDiv = document.getElementById('goa-result'); resultDiv.style.display = 'none'; resultDiv.innerHTML = '';
// Collect goals var goals = []; for (var i = 1; i ⚠ Goal 1 is required. Please select an attainment level.'; return; } if (levelVal === '') continue; // optional goal not used
var level = parseFloat(levelVal); var weight = parseFloat(weightVal);
if (isNaN(weight) || weight 4 || !Number.isInteger(weight)) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Goal ' + i + ': Weight must be a whole number between 1 and 4.'; return; } goals.push({ level: level, weight: weight, index: i }); }
if (goals.length === 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Please enter at least one goal.'; return; }
var rhoEl = document.getElementById('goa-rho'); var rho = parseFloat(rhoEl.value); if (isNaN(rho) || rho = 1) { resultDiv.style.display = 'block'; resultDiv.innerHTML = '⚠ Inter-goal correlation (ρ) must be between 0 and 0.99.'; return; }
// GAS T-score formula (Kiresuk & Sherman, 1968): // T = 50 + 10 * (Σ w_i * x_i) / sqrt( (1-ρ) * Σ w_i² + ρ * (Σ w_i)² ) // where x_i = attainment level (-2 to +2), w_i = weight
var sumWX = 0; var sumW2 = 0; var sumW = 0;
for (var g = 0; g ⚠ Cannot compute score: denominator is zero. Check weights and correlation.'; return; }
var tScore = 50 + 10 * (sumWX / denominator); tScore = Math.round(tScore * 10) / 10;
// Interpretation var interpretation = ''; var interpColor = ''; if (tScore = 40 && tScore 50 && tScore Goal ' + goals[g].index + '' + levelLabel + '' + goals[g].weight + '' + (goals[g].weight * goals[g].level).toFixed(1) + ''; }
resultDiv.style.display = 'block'; resultDiv.innerHTML = '### GAS T-Score: ' + tScore.toFixed(1) + ' ' + '' + interpretation + '
' + '' + '' + 'Goal' + 'Level (x)' + 'Weight (w)' + 'w × x' + '' + tableRows + '' + '' + 'Σ(w × x): ' + sumWX.toFixed(2) + ' | ' + 'Σw²: ' + sumW2.toFixed(2) + ' | ' + '(Σw)²: ' + (sumW * sumW).toFixed(2) + ' | ' + 'ρ: ' + rho.toFixed(2) + ' | ' + 'Denominator: ' + denominator.toFixed(4) + '
'; }
#### Formula
GAS T-Score (Kiresuk & Sherman, 1968):
T = 50 + 10 × [ Σ(wᵢ · xᵢ) ] / √[ (1 − ρ) · Σwᵢ² + ρ · (Σwᵢ)² ]
- xᵢ = attainment level for goal i: −2 (much less), −1 (less), 0 (expected), +1 (more), +2 (much more)
- wᵢ = weight (importance) assigned to goal i (integer 1–4)
- ρ = estimated inter-goal correlation (default 0.30)
- T = 50 when all goals are met exactly as expected (x = 0 for all goals)
#### Assumptions & References
- Reference: Kiresuk, T.J., & Sherman, R.E. (1968). Goal attainment scaling: A general method for evaluating comprehensive community mental health programs. Community Mental Health Journal, 4(6), 443–453.
- Reference: Kiresuk, T.J., Smith, A., & Cardillo, J.E. (Eds.). (1994). Goal Attainment Scaling: Applications, Theory, and Measurement. Lawrence Erlbaum Associates.
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