All MKGT Electrical Calculators
Explore MKGT’s free calculators for 12V, 24V and 60V systems. These tools help with cable sizing, voltage drop, fuse selection, battery runtime planning and campervan or off-grid electrical design. Use them together as part of one practical workflow: calculate, check, protect and then choose the right MKGT cable range.
Popular Paths
Not sure which tool to use first? Follow one of these simple paths to move from question to calculator, then to guide and product collection.
Sizing a Cable
Start with cable sizing, confirm voltage drop, then read the relevant guide before choosing the right cable range.
Planning a Campervan Build
Estimate daily usage, size the system, then read the wiring guide and move into battery and cable products.
Planning Solar
Estimate panel requirements, choose solar cable, review fuse guidance and move into the right product range.
Core sizing tools
Cable Size Calculator
Estimate the correct cable cross-section for 12V, 24V and 60V circuits based on system voltage, load current, one-way cable length and acceptable voltage drop.
Voltage Drop Calculator
Check estimated voltage loss in volts and percent for a selected cable size, current and cable length. Useful for automotive, campervan, leisure battery and charging circuits.
Fuse Size Calculator
Estimate a practical fuse rating based on load current or power, selected system voltage and a sensible design margin for real-world installations.
Battery Runtime Calculator
Estimate how long a battery can power your load based on Ah capacity, battery type, system voltage, power draw and optional inverter efficiency.
Campervan Cable Size Calculator
Choose the correct cable size for campervan and motorhome circuits, including interior loads, charging circuits and longer low-voltage cable runs.
Campervan Electrical System Calculator
Add your devices and estimate daily energy usage, battery size and solar requirements for a campervan, van conversion or off-grid electrical setup.
Solar Panel Size Calculator
Estimate the solar panel size needed for campervan and off-grid electrical systems based on daily energy usage and charging goals.
DC-DC Charger Cable Size Calculator
Choose a suitable cable size for DC-DC charger installations, including alternator to charger and charger to leisure battery runs.
Which calculator should I use?
If you are choosing wiring for a new circuit, the best place to start is usually the Cable Size Calculator. Once you have a cable size in mind, you can then use the Voltage Drop Calculator to check the expected voltage loss for a specific cable run.
If you also need to choose circuit protection, use the Fuse Size Calculator. For battery planning and load duration, use the Battery Runtime Calculator. For larger van conversion or off-grid planning, the campervan tools are usually the better fit.
Suggested workflow for most users
- Start with the Cable Size Calculator to estimate the required cable cross-section.
- Use the Voltage Drop Calculator to verify voltage loss for the cable size you plan to use.
- Use the Fuse Size Calculator to estimate a suitable fuse value for the circuit.
- Use the Battery Runtime Calculator if the circuit is battery powered and runtime matters.
- Use the Campervan Electrical System Calculator for full system design and off-grid planning.
Quick guide
| Tool | Best for | Main output |
|---|---|---|
| Cable Size Calculator | Choosing a cable size for a new circuit | Recommended cable size and voltage drop estimate |
| Voltage Drop Calculator | Checking a chosen cable size | Voltage loss in volts and percent |
| Fuse Size Calculator | Choosing circuit protection | Suggested fuse rating |
| Battery Runtime Calculator | Battery usage planning | Estimated runtime |
| Campervan Electrical System Calculator | Full van or off-grid setup planning | Energy, battery and solar sizing |
Recommended MKGT product routes
- 2 core 12V flat automotive cable
- 2 core 12V round automotive cable
- Battery / welding cable
- Browse all MKGT collections
Related knowledge clusters
Explore the MKGT Knowledge Hub
The MKGT Knowledge Hub brings together technical guides, electrical calculators and wiring references designed to support installers, vehicle builders and low-voltage system designers working with 12V, 24V and 60V systems.
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