Fuel Cost Calculator
Plan your travel budget with this comprehensive fuel cost calculator. Enter your trip distance, vehicle's fuel efficiency (MPG or L/100km), and current gas prices to get instant cost estimates. Compare different vehicles, calculate daily or monthly commute costs, and see how fuel efficiency impacts your wallet. Perfect for automotive websites, travel planning apps, and fleet management tools.
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export function fuelCostCalculator(form: FormTs) {
form.addRow(row => {
row.addTextPanel('header', {
computedValue: () => 'Fuel Cost Calculator',
customStyles: { 'font-size': '1.5rem', 'font-weight': '600', 'color': '#1e293b' }
});
});
form.addSpacer({ height: 20 });
// Unit System Section
const unitSection = form.addSubform('units', { title: '📐 Unit System' });
unitSection.addRow(row => {
row.addRadioButton('unitSystem', {
label: 'Measurement System',
options: [
{ id: 'us', name: 'US (miles, gallons, $/gallon)' },
{ id: 'metric', name: 'Metric (km, liters, $/liter)' }
],
defaultValue: 'us',
isRequired: true
});
});
// Trip Details Section
const tripSection = form.addSubform('trip', { title: '🚗 Trip Details' });
tripSection.addRow(row => {
row.addCheckbox('useAddresses', {
label: 'Calculate distance from addresses',
defaultValue: true,
tooltip: 'Use address inputs to calculate distance automatically'
});
});
tripSection.addRow(row => {
row.addAddress('originAddress', {
label: 'Starting Point',
placeholder: 'Enter starting address...',
distanceUnit: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'miles' : 'km',
isRequired: () => tripSection.checkbox('useAddresses')?.value() === true,
isVisible: () => tripSection.checkbox('useAddresses')?.value() === true
});
});
tripSection.addRow(row => {
row.addAddress('destAddress', {
label: 'Destination',
placeholder: 'Enter destination address...',
showMap: true,
showDistance: true,
referenceAddress: () => tripSection.address('originAddress')?.value() ?? null,
distanceUnit: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'miles' : 'km',
isRequired: () => tripSection.checkbox('useAddresses')?.value() === true,
isVisible: () => tripSection.checkbox('useAddresses')?.value() === true
});
});
tripSection.addRow(row => {
row.addDecimal('distance', {
label: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'Trip Distance (miles)' : 'Trip Distance (km)',
min: 0,
max: 100000,
defaultValue: 250,
placeholder: 'e.g. 250',
isRequired: () => tripSection.checkbox('useAddresses')?.value() !== true,
isVisible: () => tripSection.checkbox('useAddresses')?.value() !== true,
computedValue: () => {
if (tripSection.checkbox('useAddresses')?.value() === true) {
const destField = tripSection.address('destAddress');
return destField?.distance() ?? null;
}
return null;
}
}, '1fr');
row.addCheckbox('roundTrip', {
label: 'Round Trip',
defaultValue: false,
tooltip: 'Check if you need to return'
}, '1fr');
});
tripSection.addRow(row => {
row.addTextPanel('distanceInfo', {
computedValue: () => {
if (tripSection.checkbox('useAddresses')?.value() !== true) return '';
const destField = tripSection.address('destAddress');
const dist = destField?.distance();
if (dist == null) return 'Enter both addresses to calculate distance';
const unit = unitSection.radioButton('unitSystem')?.value() === 'us' ? 'miles' : 'km';
return `📍 Calculated distance: ${Math.round(dist)} ${unit}`;
},
customStyles: { 'font-size': '0.9rem', 'color': '#0369a1', 'background': '#e0f2fe', 'padding': '10px', 'border-radius': '6px' },
isVisible: () => tripSection.checkbox('useAddresses')?.value() === true
});
});
tripSection.addRow(row => {
row.addDropdown('tripType', {
label: 'Trip Type',
options: [
{ id: 'one-time', name: 'One-time Trip' },
{ id: 'daily', name: 'Daily Commute' },
{ id: 'weekly', name: 'Weekly Trip' }
],
defaultValue: 'one-time'
});
});
// Helper to get distance from addresses or manual input
const getTripDistance = () => {
if (tripSection.checkbox('useAddresses')?.value() === true) {
const destField = tripSection.address('destAddress');
return destField?.distance() ?? 250;
}
return getTripDistance();
};
// Vehicle Section
const vehicleSection = form.addSubform('vehicle', { title: '🚙 Vehicle Information' });
vehicleSection.addRow(row => {
row.addDecimal('fuelEfficiency', {
label: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'Fuel Efficiency (MPG)' : 'Fuel Efficiency (L/100km)',
min: 1,
max: unitSection.radioButton('unitSystem')?.value() === 'us' ? 100 : 30,
defaultValue: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 28 : 8.5,
placeholder: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'e.g. 28' : 'e.g. 8.5',
isRequired: true,
tooltip: () => unitSection.radioButton('unitSystem')?.value() === 'us'
? 'Miles per gallon - higher is better'
: 'Liters per 100km - lower is better'
}, '1fr');
row.addDropdown('drivingConditions', {
label: 'Driving Conditions',
options: [
{ id: 'city', name: 'City (stop and go)' },
{ id: 'highway', name: 'Highway (cruise)' },
{ id: 'mixed', name: 'Mixed' }
],
defaultValue: 'mixed',
tooltip: 'Affects fuel efficiency estimate'
}, '1fr');
});
vehicleSection.addRow(row => {
row.addTextPanel('conditionAdjustment', {
computedValue: () => {
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
const adjustments: Record<string, string> = {
'city': 'City driving typically reduces efficiency by 10-15%',
'highway': 'Highway driving often improves efficiency by 5-10%',
'mixed': 'Using your entered efficiency as-is'
};
return adjustments[conditions] || '';
},
customStyles: { 'font-size': '0.85rem', 'color': '#64748b', 'text-align': 'center' }
});
});
// Fuel Price Section
const priceSection = form.addSubform('price', { title: '⛽ Fuel Price' });
priceSection.addRow(row => {
row.addDecimal('fuelPrice', {
label: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'Price per Gallon' : 'Price per Liter',
min: 0,
max: 20,
defaultValue: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 3.50 : 1.65,
placeholder: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? 'e.g. 3.50' : 'e.g. 1.65',
isRequired: true
}, '1fr');
row.addDropdown('fuelType', {
label: 'Fuel Type',
options: [
{ id: 'regular', name: 'Regular Unleaded' },
{ id: 'midgrade', name: 'Mid-Grade' },
{ id: 'premium', name: 'Premium' },
{ id: 'diesel', name: 'Diesel' }
],
defaultValue: 'regular'
}, '1fr');
});
form.addSpacer({ height: 20, showLine: true, lineStyle: 'dashed' });
// Results Section
const resultsSection = form.addSubform('results', { title: '📊 Trip Cost Breakdown', isCollapsible: false });
resultsSection.addRow(row => {
row.addPriceDisplay('totalDistance', {
label: 'Total Distance',
computedValue: () => {
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
return isRoundTrip ? distance * 2 : distance;
},
variant: 'default',
prefix: '',
suffix: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? ' miles' : ' km'
}, '1fr');
row.addPriceDisplay('fuelNeeded', {
label: 'Fuel Needed',
computedValue: () => {
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const totalDistance = isRoundTrip ? distance * 2 : distance;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
// Adjust efficiency based on conditions
let adjustedEfficiency = efficiency;
if (unitSystem === 'us') {
if (conditions === 'city') adjustedEfficiency = efficiency * 0.85;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 1.05;
} else {
// For L/100km, higher is worse
if (conditions === 'city') adjustedEfficiency = efficiency * 1.15;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 0.95;
}
let fuelNeeded: number;
if (unitSystem === 'us') {
fuelNeeded = totalDistance / adjustedEfficiency;
} else {
fuelNeeded = (totalDistance / 100) * adjustedEfficiency;
}
return Math.round(fuelNeeded * 100) / 100;
},
variant: 'default',
prefix: '',
suffix: () => unitSection.radioButton('unitSystem')?.value() === 'us' ? ' gallons' : ' liters'
}, '1fr');
});
resultsSection.addRow(row => {
row.addPriceDisplay('tripCost', {
label: 'Trip Fuel Cost',
computedValue: () => {
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const totalDistance = isRoundTrip ? distance * 2 : distance;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const fuelPrice = priceSection.decimal('fuelPrice')?.value() || (unitSystem === 'us' ? 3.50 : 1.65);
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
let adjustedEfficiency = efficiency;
if (unitSystem === 'us') {
if (conditions === 'city') adjustedEfficiency = efficiency * 0.85;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 1.05;
} else {
if (conditions === 'city') adjustedEfficiency = efficiency * 1.15;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 0.95;
}
let fuelNeeded: number;
if (unitSystem === 'us') {
fuelNeeded = totalDistance / adjustedEfficiency;
} else {
fuelNeeded = (totalDistance / 100) * adjustedEfficiency;
}
return Math.round(fuelNeeded * fuelPrice * 100) / 100;
},
variant: 'large'
});
});
// Cost per Distance
resultsSection.addRow(row => {
row.addTextPanel('costPerDistance', {
computedValue: () => {
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const efficiencyValue = vehicleSection.decimal('fuelEfficiency')?.value();
const fuelPriceValue = priceSection.decimal('fuelPrice')?.value();
const isValidNumber = (val: unknown): val is number =>
typeof val === 'number' && !Number.isNaN(val);
const defaults = {
us: { efficiency: 28, fuelPrice: 3.50 },
metric: { efficiency: 8.5, fuelPrice: 1.65 }
};
const currentDefaults = unitSystem === 'us' ? defaults.us : defaults.metric;
const efficiency = isValidNumber(efficiencyValue) ? efficiencyValue : currentDefaults.efficiency;
const fuelPrice = isValidNumber(fuelPriceValue) ? fuelPriceValue : currentDefaults.fuelPrice;
if (efficiency <= 0) {
return 'Enter valid fuel efficiency';
}
let costPerUnit: number;
if (unitSystem === 'us') {
costPerUnit = fuelPrice / efficiency; // $ per mile
return `Cost: $${(Number(costPerUnit) || 0).toFixed(2)} per mile`;
} else {
costPerUnit = (efficiency / 100) * fuelPrice; // $ per km
return `Cost: $${(Number(costPerUnit) || 0).toFixed(2)} per km`;
}
},
customStyles: { 'font-size': '0.95rem', 'color': '#475569', 'text-align': 'center', 'font-weight': '500' }
});
});
// Recurring Costs Section
const recurringSection = form.addSubform('recurring', { title: '📅 Recurring Costs', isCollapsible: false });
recurringSection.addRow(row => {
row.addPriceDisplay('dailyCost', {
label: 'Daily Cost',
computedValue: () => {
const tripType = tripSection.dropdown('tripType')?.value() || 'one-time';
if (tripType === 'one-time') return 0;
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const totalDistance = isRoundTrip ? distance * 2 : distance;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const fuelPrice = priceSection.decimal('fuelPrice')?.value() || (unitSystem === 'us' ? 3.50 : 1.65);
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
let adjustedEfficiency = efficiency;
if (unitSystem === 'us') {
if (conditions === 'city') adjustedEfficiency = efficiency * 0.85;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 1.05;
} else {
if (conditions === 'city') adjustedEfficiency = efficiency * 1.15;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 0.95;
}
let fuelNeeded: number;
if (unitSystem === 'us') {
fuelNeeded = totalDistance / adjustedEfficiency;
} else {
fuelNeeded = (totalDistance / 100) * adjustedEfficiency;
}
const tripCost = fuelNeeded * fuelPrice;
if (tripType === 'daily') return Math.round(tripCost * 100) / 100;
if (tripType === 'weekly') return Math.round((tripCost / 7) * 100) / 100;
return 0;
},
variant: 'default',
isVisible: () => tripSection.dropdown('tripType')?.value() !== 'one-time'
}, '1fr');
row.addPriceDisplay('weeklyCost', {
label: 'Weekly Cost',
computedValue: () => {
const tripType = tripSection.dropdown('tripType')?.value() || 'one-time';
if (tripType === 'one-time') return 0;
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const totalDistance = isRoundTrip ? distance * 2 : distance;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const fuelPrice = priceSection.decimal('fuelPrice')?.value() || (unitSystem === 'us' ? 3.50 : 1.65);
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
let adjustedEfficiency = efficiency;
if (unitSystem === 'us') {
if (conditions === 'city') adjustedEfficiency = efficiency * 0.85;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 1.05;
} else {
if (conditions === 'city') adjustedEfficiency = efficiency * 1.15;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 0.95;
}
let fuelNeeded: number;
if (unitSystem === 'us') {
fuelNeeded = totalDistance / adjustedEfficiency;
} else {
fuelNeeded = (totalDistance / 100) * adjustedEfficiency;
}
const tripCost = fuelNeeded * fuelPrice;
if (tripType === 'daily') return Math.round(tripCost * 5 * 100) / 100; // 5 work days
if (tripType === 'weekly') return Math.round(tripCost * 100) / 100;
return 0;
},
variant: 'default',
isVisible: () => tripSection.dropdown('tripType')?.value() !== 'one-time'
}, '1fr');
row.addPriceDisplay('monthlyCost', {
label: 'Monthly Cost',
computedValue: () => {
const tripType = tripSection.dropdown('tripType')?.value() || 'one-time';
if (tripType === 'one-time') return 0;
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const totalDistance = isRoundTrip ? distance * 2 : distance;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const fuelPrice = priceSection.decimal('fuelPrice')?.value() || (unitSystem === 'us' ? 3.50 : 1.65);
const conditions = vehicleSection.dropdown('drivingConditions')?.value() || 'mixed';
let adjustedEfficiency = efficiency;
if (unitSystem === 'us') {
if (conditions === 'city') adjustedEfficiency = efficiency * 0.85;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 1.05;
} else {
if (conditions === 'city') adjustedEfficiency = efficiency * 1.15;
else if (conditions === 'highway') adjustedEfficiency = efficiency * 0.95;
}
let fuelNeeded: number;
if (unitSystem === 'us') {
fuelNeeded = totalDistance / adjustedEfficiency;
} else {
fuelNeeded = (totalDistance / 100) * adjustedEfficiency;
}
const tripCost = fuelNeeded * fuelPrice;
if (tripType === 'daily') return Math.round(tripCost * 22 * 100) / 100; // ~22 work days
if (tripType === 'weekly') return Math.round(tripCost * 4.33 * 100) / 100;
return 0;
},
variant: 'success',
isVisible: () => tripSection.dropdown('tripType')?.value() !== 'one-time'
}, '1fr');
});
recurringSection.addRow(row => {
row.addTextPanel('recurringNote', {
computedValue: () => {
const tripType = tripSection.dropdown('tripType')?.value() || 'one-time';
if (tripType === 'one-time') {
return 'Select "Daily Commute" or "Weekly Trip" above to see recurring costs';
}
return tripType === 'daily' ? 'Based on 5 working days per week, 22 days per month' : 'Based on 4.33 weeks per month';
},
customStyles: { 'font-size': '0.85rem', 'color': '#64748b', 'text-align': 'center' }
});
});
// Summary Section
const summarySection = form.addSubform('summary', {
title: '🧾 Summary',
isCollapsible: false,
sticky: 'bottom'
});
summarySection.addRow(row => {
row.addTextPanel('summaryText', {
computedValue: () => {
const unitSystem = unitSection.radioButton('unitSystem')?.value() || 'us';
const distance = getTripDistance();
const isRoundTrip = tripSection.checkbox('roundTrip')?.value() || false;
const efficiency = vehicleSection.decimal('fuelEfficiency')?.value() || (unitSystem === 'us' ? 28 : 8.5);
const fuelPrice = priceSection.decimal('fuelPrice')?.value() || (unitSystem === 'us' ? 3.50 : 1.65);
const totalDistance = isRoundTrip ? distance * 2 : distance;
const distanceUnit = unitSystem === 'us' ? 'miles' : 'km';
const efficiencyUnit = unitSystem === 'us' ? 'MPG' : 'L/100km';
const volumeUnit = unitSystem === 'us' ? 'gallon' : 'liter';
// Show route info if addresses are used
let routeInfo = '';
if (tripSection.checkbox('useAddresses')?.value() === true) {
const originAddr = tripSection.address('originAddress')?.value();
const destAddr = tripSection.address('destAddress')?.value();
const originCity = originAddr?.formattedAddress?.split(',')[0] || 'Start';
const destCity = destAddr?.formattedAddress?.split(',')[0] || 'End';
routeInfo = `${originCity} → ${destCity} | `;
}
return `${routeInfo}${totalDistance} ${distanceUnit}${isRoundTrip ? ' (round trip)' : ''} at ${efficiency} ${efficiencyUnit} @ $${(Number(fuelPrice) || 0).toFixed(2)}/${volumeUnit}`;
},
customStyles: { 'font-size': '0.95rem', 'font-weight': '500', 'text-align': 'center', 'color': '#1e293b' }
});
});
summarySection.addRow(row => {
row.addTextPanel('disclaimer', {
computedValue: () => 'Estimates based on average conditions. Actual fuel costs may vary based on driving style, traffic, weather, and vehicle condition.',
customStyles: { 'font-size': '0.8rem', 'color': '#64748b', 'text-align': 'center' }
});
});
form.configureSubmitButton({
label: 'Save Trip'
});
}
Frequently Asked Questions
How do I find my car's MPG?
Check your car's specifications, look at the window sticker (for new cars), or calculate it yourself by dividing miles driven by gallons used. Many modern cars also display real-time MPG on the dashboard.
What's the difference between city and highway MPG?
City MPG is typically lower due to frequent stopping and starting. Highway MPG is usually higher because of consistent speeds. For mixed driving, use a combined average or estimate 60% city / 40% highway.
How can I improve my fuel efficiency?
Maintain proper tire pressure, avoid aggressive acceleration, use cruise control on highways, remove excess weight, keep up with maintenance, and avoid excessive idling.
Can I use this for electric vehicles?
This calculator is designed for gasoline/diesel vehicles. For EVs, you'd need to calculate electricity costs differently (kWh/mile and electricity rates).
Can I customize this calculator?
Yes. You can adjust all parameters, set default fuel prices for your region, and embed it on your automotive or travel website.