smtcalc.com  ·  For the Shop Floor & Engineering Desk

Practical SMT Tools
That Actually Work

Free, no-nonsense calculators and process tools. Built by electronics manufacturing professionals, not an agency. No accounts. No ads. Just results.

17 Tools Available
100% Free Always
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Available Tools

Moisture & Materials
MSL Bake Calculator
Bake time for moisture-sensitive devices per J-STD-033D. Enter MSL level, body thickness, and floor life exposure to get required bake time at 40, 90, or 125°C.
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Moisture & Materials
Bare Board Bake Calculator
Required drying time for bare PCBs before assembly. Based on board material group and storage history using the Arrhenius diffusion model.
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Moisture & Materials
MSL Tracker
Free Excel workbook for floor life tracking across your production floor. Color-coded dashboard, bake logging, and RH correction per J-STD-033D. Requires Excel 2021 or 365.
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Moisture & Materials
Solder Alloy Reference
Compare RoHS lead-free alloys side by side. Filter by process type, sort by thermal properties. Covers SAC305, SN100C, BiSn, Innolot, and more.
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Paste & Print
Stencil Architect
Validate stencil apertures against IPC-7525 rules. Instant feedback on area ratio, aspect ratio, and paste release -- before you order the stencil.
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Paste & Print
Pin-in-Paste Calculator
Aperture dimensions and paste volume for through-hole reflow. Supports round and rectangular pins. Based on IPC-7525A and Pappus-Guldin fillet geometry.
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Paste & Print
Solder Paste Volume Calculator
Aperture volume, deposit after transfer efficiency, and solder volume after reflow. IPC-7525A area ratio verdict. Rectangular and circular apertures.
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Paste & Print
Flux Designator Decoder
Decode any J-STD-004B flux designator to base material, activity level, and halide content. Reverse lookup from properties to designator. All 24 codes covered.
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Process & Quality
SMT Defect Diagnostics
Structured defect tree for bridging, opens, tombstoning, voiding, HiP, cold joints, and more. Ranked root causes with specific corrective actions.
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Process & Quality
SMD Resistor Code Calculator
Decode SMD resistor markings on the spot. 3-digit, 4-digit, and EIA-96 precision codes. Reverse lookup from resistance value to code.
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Line Performance
SMT Capacity Calculator
SMT line throughput in boards per hour. Factors in component count, feeder setup, OEE, shift model, and machine cycle times.
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Line Performance
Reflow Throughput Calculator
Check if your reflow oven keeps up with the line. Calculate minimum tunnel length for a target production rate. Includes P&P bottleneck check.
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Line Performance
Placement Speed Verifier
Actual derated placement rate from real production data. Enter elapsed time and product mix for true CPH -- not the datasheet number.
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Line Performance
SMT Line Capacity Planner
Full-line capacity across printer, placer, and reflow. Models OEE, panelisation, changeover losses, and multi-product scenarios. Free Excel download.
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Planning & Reference
AOI ROI Calculator
ROI for AOI machine investment. FTE model comparing manual vs. automated inspection. DCF analysis with residual value and a 10-year savings chart.
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Planning & Reference
SMT Equipment ROI Calculator
Business case for a pick-and-place line upgrade. NPV, IRR, and year-by-year cash flow across up to five machines. For the finance department.
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Planning & Reference
IPC Standards Finder
Find the right IPC or J-STD document fast. 75+ indexed standards across assembly, PCB design, materials, cleaning, and more.
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Planning & Reference
SMT Slots
SMT-themed slot machine. IC chips pay the jackpot, resistors pay the least. Five win lines and a doubling feature. For entertainment only.
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Built by People Who
Work in the Industry

Every tool on SMTCalc was built by engineers and technicians who have spent time on the shop floor. No bloat, no sales pitch -- just the calculations you need, done correctly.

Browse all 17 tools →
IPC & JEDEC Standard References
Calculations are grounded in J-STD-033, IPC-7525, and other published standards -- not approximations.
No Account, No Paywall
Every tool is fully free. No email required, no feature-gating, no premium tier. Open and use.
Works on the Shop Floor
Designed for mobile and tablet use. Fast load, minimal UI, results first.
Continuously Updated
Tools are reviewed and updated as standards evolve. New tools added based on real engineer requests.