Arduino Project Cost Calculator
Component cost from project parts list.
About this calculator
This calculator builds a bottom-up bill-of-materials estimate for an Arduino or similar microcontroller project rather than pulling from a fixed parts catalog. You supply the board cost plus counts and average unit costs for shields/modules and sensors, and a running count of passive components (resistors, capacitors, LEDs, headers) priced at a flat $0.10 each — a reasonable average in hobby quantities. On top of those line items it adds a connector and wiring allowance that scales with your module and sensor count ($5 base plus $0.50 per shield or sensor, covering jumper wires, headers, and breadboard needs) plus flat estimates for a power supply ($8) and whatever PCB and enclosure costs you enter directly.
Shipping is modeled as a flat $5 for orders with a subtotal under $25, switching to 8% of the subtotal above that threshold — a rough proxy for the fact that hobbyist orders from multiple suppliers rarely ship free below a minimum. The final "Total + Contingency" figure adds a 10% buffer on top of the pre-shipping project subtotal, a realistic cushion for the parts that inevitably get fried, miswired, or need a second try. Because every cost here is an average or estimate you supply rather than a live price lookup, accuracy depends entirely on how well your per-unit figures reflect what you'll actually pay — bulk sensor packs, marketplace deals, and import shipping fees can all swing the real total well outside a quick estimate like this.
Inputs
Results
Electronics Subtotal ($)
$66.50
Project Subtotal ($)
$96.50
How to Use This Calculator
- Enter the cost of your microcontroller board and the number of shields or expansion modules.
- Set average shield and sensor costs along with total passive component count and cost.
- Include PCB and 3D-printed enclosure costs if applicable.
- Review the electronics subtotal, project subtotal, estimated shipping, and grand total with contingency.
How the result changes with Shields / Modules
| Shields / Modules | Electronics Subtotal ($) | Project Subtotal ($) |
|---|---|---|
| 1 | $58.00 | $88.00 |
| 1.5 | $58.00 | $88.00 |
| 3 | $75.00 | $105.00 |
| 5 | $92.00 | $122.00 |
What each input means
- Microcontroller Board ($)
- Cost of main board (Arduino Uno ~$25, Nano ~$12, ESP32 ~$8, Mega ~$40).
- Shields / Modules
- Number of add-on shields or breakout modules (motor driver, relay, display, etc.).
- Avg Shield Cost ($)
- Average cost per shield/module.
- Sensor Count
- Number of sensors (temperature, motion, light, distance, etc.).
- Avg Sensor Cost ($)
- Average cost per sensor.
- Passive Components
- Total resistors, capacitors, LEDs, diodes, transistors, wire, headers.
- PCB / Breadboard ($)
- Cost for PCB fabrication or breadboard/perfboard.
- Enclosure ($)
- Project enclosure (3D printed, off-the-shelf, or custom).
What each result means
- Electronics Subtotal ($)
- Total cost of electronic components only.
- Project Subtotal ($)
- All costs before shipping (includes PCB, enclosure, power supply).
- Est. Shipping ($)
- Estimated shipping cost.
- Grand Total ($)
- Total project cost including shipping.
- Contingency (10%) ($)
- Budget buffer for mistakes and replacement parts.
- Total + Contingency ($)
- Grand total with 10% contingency for a realistic budget.
- Shields Total ($)
- Total shield/module cost.
- Sensors Total ($)
- Total sensor cost.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMicrocontroller Board ($) = 25, Shields / Modules = 2, Avg Shield Cost ($) = 8, Sensor Count = 3 = 8 input(s) provided
- Calculate Electronics SubtotalElectronics Subtotal = boardCost + shieldTotal + sensorTotal + passiveTotal + connectorCost66.5 = $66.5
- Calculate Project SubtotalProject Subtotal = componentSubtotal + pcbCost + enclosureCost + powerSupplyCost96.5 = $96.5
- Calculate Est. Shipping7.72 = $7.72
- Calculate Grand TotalGrand Total = projectSubtotal + shippingEstimate104.22 = $104.22
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Where does the $0.10-per-passive-component figure come from, and can I adjust it?
It's a fixed constant baked into the engine, representing a reasonable average unit cost for resistors, capacitors, LEDs, diodes, and headers bought in hobby quantities — it isn't an input you can change directly. If your project uses unusually expensive passives (precision resistors, tantalum capacitors) or you're buying in bulk at a lower per-unit price, adjust your Passive Components count up or down to compensate, since the dollar-per-unit rate itself is not exposed.
Why does the connector/wiring allowance change when I add more shields or sensors?
The formula is a $5 base cost plus $0.50 per shield and per sensor, on the reasoning that every additional module or sensor you connect typically needs its own jumper wires and header pins, so the wiring budget scales with your module count rather than staying flat. It's a proxy estimate, not a parts-counted total, so a project using ribbon cables or a custom harness instead of jumpers may cost noticeably less than this line suggests.
Why does shipping jump from a flat $5 to a percentage-based estimate?
The engine switches at a $25 project subtotal: below that threshold it assumes a flat $5 shipping charge (typical for a single small hobbyist order), and at or above it switches to 8% of the subtotal, reflecting that larger orders often span multiple suppliers or heavier packages. It's a simplified two-tier model, not a real shipping-rate lookup, so actual costs will vary by vendor, weight, and how many separate packages your parts arrive in.
What's the difference between Grand Total and Total + Contingency?
Grand Total is the project subtotal (electronics, PCB, enclosure, power supply) plus the shipping estimate. Total + Contingency takes that same grand total and adds a separate 10% buffer calculated from the pre-shipping project subtotal — accounting for the parts that inevitably get fried during soldering, miswired, or need a second attempt. Budget to the Total + Contingency figure if you want realistic headroom for a first build.
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