National Education Funding Estimator

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.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; } }

National Education Funding Estimator

Estimates total national (or district-level) education funding by combining federal, state, and local contributions, adjusted for student demographics such as special education and English language learner (ELL) populations.

Total Student Enrollment

Total number of enrolled K-12 students

Base Per-Pupil Expenditure (USD)

Average base spending per student per year (national avg ~$13,000)

Federal Funding Share (%)

Percentage of total funding from federal sources (historically ~8%)

State Funding Share (%)

Percentage of total funding from state sources (historically ~47%)

Special Education Students (%)

Percentage of students receiving special education services (~14% nationally)

Special Education Funding Weight

Multiplier for special ed students relative to base PPE (typical range: 1.5–2.3)

English Language Learner Students (%)

Percentage of students classified as ELL (~10% nationally)

ELL Funding Weight

Multiplier for ELL students relative to base PPE (typical range: 1.1–1.5)

Title I Eligible Students (%)

Percentage of students in Title I (low-income) schools (~25% nationally)

Title I Supplemental Funding per Eligible Student (USD)

Additional federal Title I dollars per eligible student (avg ~$1,500)

Calculate Funding Estimate Fill in the fields above and click Calculate.

function natCalc() { var resultDiv = document.getElementById("nat_result");

// --- Parse inputs --- var enrollment = parseFloat(document.getElementById("nat_enrollment").value); var basePPE = parseFloat(document.getElementById("nat_base_ppe").value); var federalPct = parseFloat(document.getElementById("nat_federal_pct").value); var statePct = parseFloat(document.getElementById("nat_state_pct").value); var spedPct = parseFloat(document.getElementById("nat_sped_pct").value); var spedWeight = parseFloat(document.getElementById("nat_sped_weight").value); var ellPct = parseFloat(document.getElementById("nat_ell_pct").value); var ellWeight = parseFloat(document.getElementById("nat_ell_weight").value); var title1Pct = parseFloat(document.getElementById("nat_title1_pct").value); var title1Supp = parseFloat(document.getElementById("nat_title1_supplement").value);

// --- Validation --- var errors = []; if (isNaN(enrollment) || enrollment 100) errors.push("Federal Funding Share must be between 0% and 100%."); if (isNaN(statePct) || statePct 100) errors.push("State Funding Share must be between 0% and 100%."); if (!isNaN(federalPct) && !isNaN(statePct) && (federalPct + statePct) > 100) errors.push("Federal + State shares cannot exceed 100% (local share would be negative)."); if (isNaN(spedPct) || spedPct 100) errors.push("Special Education percentage must be between 0% and 100%."); if (isNaN(spedWeight) || spedWeight 100) errors.push("ELL percentage must be between 0% and 100%."); if (isNaN(ellWeight) || ellWeight 100) errors.push("Special Education % + ELL % cannot exceed 100%."); if (isNaN(title1Pct) || title1Pct 100) errors.push("Title I eligible percentage must be between 0% and 100%."); if (isNaN(title1Supp) || title1Supp 0) { resultDiv.innerHTML = "Please fix the following errors:" + errors.map(function(e){ return ""; }).join("") + ""; return; }

// --- Derived shares --- var localPct = 100 - federalPct - statePct; // remainder goes to local

// --- Student population segments --- // Overlap-aware: special ed and ELL students may overlap; we treat them as additive // adjustments on top of the general population base. var spedStudents = enrollment * (spedPct / 100); var ellStudents = enrollment * (ellPct / 100); var title1Students = enrollment * (title1Pct / 100);

// General students = those not in sped or ELL (approximate, no double-count correction // applied here since weights are marginal additions above base) var generalStudents = enrollment; // base applies to all; weights are incremental

// --- Weighted Enrollment (Adequacy Model) --- // Formula: // Weighted Enrollment = Enrollment // + SpEd_Students * (SpEd_Weight - 1) // + ELL_Students * (ELL_Weight - 1) // // This adds the extra cost above base for each weighted group. var weightedEnrollment = enrollment + spedStudents * (spedWeight - 1) + ellStudents * (ellWeight - 1);

// --- Base Total Funding (before Title I supplement) --- // Total_Base_Funding = Weighted_Enrollment * Base_PPE var totalBaseFunding = weightedEnrollment * basePPE;

// --- Title I Supplemental Funding --- // Title1_Funding = Title1_Students * Title1_Supplement_Per_Student var title1Funding = title1Students * title1Supp;

// --- Grand Total Funding --- // Total_Funding = Total_Base_Funding + Title1_Funding var totalFunding = totalBaseFunding + title1Funding;

// --- Funding by Source --- // Federal and State shares apply to base funding; Title I is entirely federal. var federalBase = totalBaseFunding * (federalPct / 100); var stateBase = totalBaseFunding * (statePct / 100); var localBase = totalBaseFunding * (localPct / 100); var federalTotal = federalBase + title1Funding; // Title I is federal var stateTotal = stateBase; var localTotal = localBase;

// --- Effective Per-Pupil Expenditure --- var effectivePPE = totalFunding / enrollment;

// --- Formatting helper --- function fmt(n) { if (n >= 1e12) return "$" + (n / 1e12).toFixed(2) + " trillion"; if (n >= 1e9) return "$" + (n / 1e9).toFixed(2) + " billion"; if (n >= 1e6) return "$" + (n / 1e6).toFixed(2) + " million"; return "$" + n.toLocaleString("en-US", {minimumFractionDigits:0, maximumFractionDigits:0}); } function fmtPct(n) { return n.toFixed(1) + "%"; } function fmtN(n) { return Math.round(n).toLocaleString("en-US"); }

// --- Output --- resultDiv.innerHTML = "### Funding Estimate Results " +

"" + "MetricValue" +

"Total Estimated Funding" + fmt(totalFunding) + "" + "Base Funding (Weighted Enrollment × Base PPE)" + fmt(totalBaseFunding) + "" + "Title I Supplemental Funding" + fmt(title1Funding) + "" +

"Funding by Source" + "Federal (incl. Title I)" + fmt(federalTotal) + " (" + fmtPct(federalTotal/totalFunding100) + ")" + "State" + fmt(stateTotal) + " (" + fmtPct(stateTotal/totalFunding100) + ")" + "Local" + fmt(localTotal) + " (" + fmtPct(localTotal/totalFunding*100) + ")" +

"Enrollment Breakdown" + "Total Enrollment" + fmtN(enrollment) + "" + "Weighted Enrollment" + fmtN(weightedEnrollment) + "" + "Special Education Students" + fmtN(spedStudents) + " (" + fmtPct(spedPct) + ")" + "ELL Students" + fmtN(ellStudents) + " (" + fmtPct(ellPct) + ")" + "Title I Eligible Students" + fmtN(title1Students) + " (" + fmtPct(title1Pct) + ")" +

"Per-Pupil Metrics" + "Base Per-Pupil Expenditure$" + basePPE.toLocaleString() + "" + "Effective Per-Pupil Expenditure$" + Math.round(effectivePPE).toLocaleString() + "" + ""; }

#### Formulas Used

1. Weighted Enrollment (Adequacy Weighting Model):

Weighted Enrollment = Enrollment + (Enrollment × SpEd%) × (SpEd Weight − 1) + (Enrollment × ELL%) × (ELL Weight − 1) The weights represent the incremental cost above the base for each student group. A SpEd weight of 1.9 means special ed students cost 90% more than a general education student.

2. Base Total Funding:

Base Total Funding = Weighted Enrollment × Base Per-Pupil Expenditure

3. Title I Supplemental Funding:

Title I Funding = (Enrollment × Title I%) × Title I Supplement per Student

4. Grand Total Funding:

Total Funding = Base Total Funding + Title I Funding

5. Funding by Source:

Federal Funding = (Base Total Funding × Federal%) + Title I Funding State Funding = Base Total Funding × State% Local Funding = Base Total Funding × Local% where Local% = 100% − Federal% − State%

6. Effective Per-Pupil Expenditure:

Effective PPE = Total Funding ÷ Total Enrollment

#### Assumptions & References

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