Free calculators
Every calculator runs in your browser, shows how the math works and includes a worked example you can check by hand.
Trucking
- Free toolIFTA Fuel Tax CalculatorFree IFTA fuel tax calculator for owner operators. Enter miles, gallons and each jurisdiction's tax rate to see fleet MPG and the tax you owe or the credit you earn.
- Free toolCost Per Mile and Break-EvenFree trucking cost per mile calculator. Add fuel, maintenance, tires and monthly fixed costs to find your true cost per mile, profit per mile and break-even miles.
- Free toolPer Diem CalculatorFree per diem calculator for truck drivers. Enter days away, the current rate and the deductible percentage to estimate your meal allowance deduction.
Network and homelab
- Free toolIPv4 Subnet and VLSM CalculatorFree IPv4 subnet calculator and VLSM planner. Get network, broadcast, mask, usable hosts, then split a block into right-sized subnets for each VLAN.
- Free toolPoE Power Budget CalculatorFree PoE power budget calculator. Add your phones, access points and cameras to see total draw against the switch's PoE budget and how much headroom is left.
- Free toolUPS Runtime CalculatorFree UPS runtime calculator. Enter battery voltage, amp-hours, load and efficiency to estimate how long your UPS keeps a rack or homelab running.
- Free toolHomelab Electricity Cost CalculatorFree homelab electricity cost calculator. Add each server, switch and NAS with watts and hours to see the monthly and yearly power bill, with optional cooling overhead.
- Free toolBandwidth Oversubscription CalculatorFree network oversubscription calculator. Compare total access port speed to uplink capacity and get the oversubscription ratio for a switch or a layer.