EV Range vs. Charging Time Calculator

ANA›Life Services Authority›National Calculator Authority›EV Range vs. Charging Time Calculator

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EV Range vs. Charging Time Calculator

Estimate your electric vehicle's charging time and driving range based on battery capacity, charger power, and efficiency.

Battery Capacity (kWh)

Total usable battery capacity of your EV (e.g. Tesla Model 3 LR ≈ 75 kWh)

Current State of Charge (%)

Your battery's current charge level

Target State of Charge (%)

Desired charge level (80% recommended for daily use to preserve battery health)

Charger Power (kW)

Level 1 ≈ 1.4 kW | Level 2 ≈ 7.2–19.2 kW | DC Fast ≈ 50–350 kW

Charger Efficiency (%)

Typical AC charging efficiency is 85–92%; DC fast charging is 92–95%

Energy Consumption (Wh/mile)

Average EV uses 250–400 Wh/mile (EPA combined). Check your vehicle's spec sheet.

Calculate

### Results

function evCalc() { const errEl = document.getElementById('ev-error'); const resEl = document.getElementById('ev-result'); const gridEl = document.getElementById('ev-result-grid'); errEl.style.display = 'none'; resEl.style.display = 'none'; gridEl.innerHTML = '';

// --- Read inputs --- const batteryKwh = parseFloat(document.getElementById('ev-battery-capacity').value); const currentSoc = parseFloat(document.getElementById('ev-current-soc').value); const targetSoc = parseFloat(document.getElementById('ev-target-soc').value); const chargerKw = parseFloat(document.getElementById('ev-charger-power').value); const efficiencyPct = parseFloat(document.getElementById('ev-charger-efficiency').value); const consumptionWh = parseFloat(document.getElementById('ev-consumption').value);

// --- Validation --- const errors = []; if (isNaN(batteryKwh) || batteryKwh 99) errors.push("Current SoC must be between 0% and 99%."); if (isNaN(targetSoc) || targetSoc 100) errors.push("Target SoC must be between 1% and 100%."); if (!isNaN(currentSoc) && !isNaN(targetSoc) && targetSoc 100) errors.push("Charger efficiency must be between 50% and 100%."); if (isNaN(consumptionWh) || consumptionWh 0) { errEl.innerHTML = errors.map(e => '⚠ ' + e).join(''); errEl.style.display = 'block'; return; }

// --- Core Formulas ---

// 1. Energy needed to charge (kWh drawn from grid, accounting for efficiency losses) // Energy stored in battery = batteryKwh × (targetSoc - currentSoc) / 100 // Grid energy required = Energy stored / (efficiency / 100) const energyToStore_kWh = batteryKwh * (targetSoc - currentSoc) / 100; const efficiency = efficiencyPct / 100; const gridEnergy_kWh = energyToStore_kWh / efficiency;

// 2. Charging time (hours) = Grid energy (kWh) / Charger power (kW) const chargingTime_hrs = gridEnergy_kWh / chargerKw; const chargingTime_min = chargingTime_hrs * 60; const hours = Math.floor(chargingTime_hrs); const minutes = Math.round((chargingTime_hrs - hours) * 60);

// 3. Range added from this charge session (miles) // Usable energy added (kWh) = energyToStore_kWh // Range (miles) = (energyToStore_kWh × 1000 Wh/kWh) / consumptionWh per mile const rangeAdded_miles = (energyToStore_kWh * 1000) / consumptionWh;

// 4. Total range at target SoC (miles) // Total usable energy at target SoC = batteryKwh × targetSoc / 100 const totalEnergy_kWh = batteryKwh * targetSoc / 100; const totalRange_miles = (totalEnergy_kWh * 1000) / consumptionWh;

// 5. Effective charging rate (miles of range added per hour of charging) const milesPerHour = rangeAdded_miles / chargingTime_hrs;

// 6. Cost estimate (informational, using US avg ~$0.16/kWh) const costPerKwh = 0.16; const estimatedCost = gridEnergy_kWh * costPerKwh;

// --- Format time string --- let timeStr = ''; if (hours > 0 && minutes > 0) timeStr = hours + ' hr ' + minutes + ' min'; else if (hours > 0) timeStr = hours + ' hr'; else timeStr = minutes + ' min';

// --- Display results --- const results = [ { label: 'Energy to Store in Battery', value: energyToStore_kWh.toFixed(2) + ' kWh', note: 'Net energy added to battery pack' }, { label: 'Grid Energy Required', value: gridEnergy_kWh.toFixed(2) + ' kWh', note: 'Includes charger efficiency losses' }, { label: 'Charging Time', value: timeStr, note: '(' + chargingTime_min.toFixed(0) + ' minutes total)' }, { label: 'Range Added This Session', value: rangeAdded_miles.toFixed(1) + ' miles', note: 'Based on ' + consumptionWh + ' Wh/mile consumption' }, { label: 'Total Range at Target SoC', value: totalRange_miles.toFixed(1) + ' miles', note: 'At ' + targetSoc + '% charge' }, { label: 'Effective Charging Speed', value: milesPerHour.toFixed(1) + ' miles/hr', note: 'Miles of range gained per hour of charging' }, { label: 'Estimated Charging Cost', value: '$' + estimatedCost.toFixed(2), note: 'At $0.16/kWh US avg (home charging)' }, ];

results.forEach(r => { const card = document.createElement('div'); card.className = 'calc-result-card'; card.innerHTML = '' + r.label + '' + '' + r.value + '' + '' + r.note + ''; gridEl.appendChild(card); });

resEl.style.display = 'block'; }

.calc-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-bottom: 20px; } .calc-field { display: flex; flex-direction: column; gap: 4px; } .calc-field label { font-weight: 600; font-size: 0.9rem; } .calc-field input { padding: 8px 10px; border: 1px solid #ccc; border-radius: 6px; font-size: 1rem; } .calc-field small { color: #666; font-size: 0.78rem; } .calc-result-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; margin-top: 12px; } .calc-result-card { background: #f0f7ff; border: 1px solid #c3daf9; border-radius: 8px; padding: 14px; } .calc-result-label { font-size: 0.82rem; color: #555; margin-bottom: 4px; } .calc-result-value { font-size: 1.4rem; font-weight: 700; color: #1a73e8; } .calc-result-note { font-size: 0.75rem; color: #777; margin-top: 4px; }

#### Formulas Used

1. Energy to store in battery (kWh): E_stored = Battery_Capacity × (Target_SoC − Current_SoC) / 100

2. Grid energy required (kWh): E_grid = E_stored / Charger_Efficiency Accounts for heat and conversion losses during AC→DC conversion.

3. Charging time (hours): T = E_grid / Charger_Power

4. Range added (miles): Range_added = (E_stored × 1000) / Energy_Consumption_Wh_per_mile

5. Total range at target SoC (miles): Range_total = (Battery_Capacity × Target_SoC / 100 × 1000) / Energy_Consumption

6. Effective charging speed (miles/hr): Speed = Range_added / T

#### Assumptions & References

More Calculators

References

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