Free Calculators & Tools for Networking, Electrical & Everyday Use
Calculate power, plan networks, convert units, check battery runtime, generate passwords, estimate fuel cost, and more. Instant results, no sign-up.
๐ Networking & IT Tools
Subnet Calculator
Network, broadcast, mask & hosts
IP Range Calculator
Count IPs between two addresses
WiFi Coverage
How many APs for your space?
AP Capacity
Users, devices & bandwidth per AP
PtP Link Budget
FSPL, received signal & margin
Fresnel Zone
Wireless clearance calculator
PoE Voltage Drop
Voltage & power loss over cable
dBm โ mW
Convert wireless power levels
Bandwidth Calculator
Transfer time, Mbps & MB/s
VLAN Planning
Subnet & gateway planner
WiFi Password Generator
Secure random WiFi passwords
WiFi QR Code Generator
QR code for instant WiFi access
Password Generator
Strong random passwords
MAC Address Generator
Random MAC in any format
UUID Generator
Generate UUID v4 identifiers
JSON Formatter
Format, minify & validate JSON
Base64 Encoder / Decoder
Encode and decode Base64 text
URL Encoder / Decoder
Percent-encode and decode URLs
๐ Battery & Backup Calculators
Battery Runtime
Any voltage, Ah, and load
Battery Runtime 12V
12V systems: car, RV, marine
Battery Runtime 24V
24V off-grid & telecom systems
Battery Runtime 48V
48V solar & EV battery banks
Battery Capacity
Required Ah for autonomy days
Battery Charging Time
Hours to reach target SoC
UPS Runtime
How long will your UPS last?
UPS Size
What VA rating do you need?
โก Electrical Calculators
Watts to Amps
DC, single & three phase
Amps to Watts
DC, single & three phase
kW to Amps
Single & three phase
Amps to kW
Single & three phase
kVA to kW
Apparent to real power
kW to kVA
Real to apparent power
Volts to Watts
AC and DC circuits
Watts to Volts
AC and DC circuits
Power Factor
From kW/kVA, P/Q, or angle
Single Phase Current
kW, V, PF to amps
3 Phase Current
Three phase amps calculation
Electrical Load
Multi-circuit total load
Voltage Drop
Copper & aluminum wire
๐ง Sizing & Selection Tools
Wire Size (AWG)
NEC-based sizing with VD check
Cable Size (mmยฒ)
IEC metric cable sizing
Breaker Size
Standard & continuous loads
Fuse Size
Motor and general loads
Inverter Size
Running, surge, and margin
Generator Size
Running + surge watts
Solar Panel Size
By daily kWh and sun hours
Battery Capacity
Ah and kWh needed
UPS Size
What VA rating do you need?
House Load
Appliance checklist to panel size
๐ก Energy & Cost Calculators
Electricity Cost
Watts to daily/monthly cost
Monthly Bill
kWh usage to monthly bill
Appliance Energy
Multi-appliance cost calculator
Energy Usage
kWh and cost from watts
kWh to Cost
Instant cost from kWh
EV Charging Cost
Cost to charge any EV
AC Consumption
BTU and EER to cost
Heater Consumption
Running cost of electric heaters
Refrigerator Energy
Monthly fridge running cost
Solar Savings
Payback & 25-year savings
๐๏ธ Everyday Tools
Percentage
% of, what %, % change
Discount
Final price after discount
Profit Margin
Revenue, cost & margin
Markup
Selling price from cost + markup
Average
Mean, median, min, max
Unit Converter
Length, weight, temp, speed & more
Date Calculator
Days between dates, add & subtract
Time Duration
Time diff & decimal conversion
VAT Calculator
Add or remove sales tax
Price Per Unit
Compare two items by unit cost
Fuel Cost
Trip cost by km/L, L/100km or mpg
Word Counter
Words, chars, sentences, reading time
Text Case Converter
UPPER, lower, Title, Sentence, slug