Practical tools for real-world problems
Calculate, check, compare and understand what to do next.
Featured tools
Brick quantity calculator
How many bricks you need for a wall, with a reverse mode for a fixed brick count.
Concrete volume calculator
How much concrete you need for a slab, footing or base, with a reverse mode.
Cups to grams by ingredient
Convert a US cup measurement to grams for common baking ingredients.
Recipe scaler
Scale a recipe to a different number of servings, with a reverse mode for a fixed ingredient amount.
YAML Semantic Difference Checker
Shows how the same YAML means something different under YAML 1.1 vs YAML 1.2 rules.
EV charging cost calculator
What an EV charge will cost, from battery size, charge range and electricity price.
MPG to L/100km converter
Converts UK mpg fuel economy figures to litres-per-100km.
Appliance running-cost calculator
How much it costs to run any electrical appliance from its power rating and usage.
LED lighting cost calculator
How much it costs to run a set of LED bulbs from their wattage, count and daily use.
Food portions estimator
Works out roughly how much food to prepare or order for an event.
Pizza quantity estimator
Works out how many pizzas to order for a party.
Markdown Portability Preflight
Checks Markdown source for constructs that render differently across GitHub-Flavored Markdown, strict CommonMark and stripped-down renderers.
Mulch calculator
How much bark or wood-chip mulch you need for a bed, with a reverse mode for a fixed bag count.
Topsoil calculator
How much topsoil you need for a bed, border or levelling job, in cubic metres and bags.
Moving-cost planner
A rough budget for a house move by property size, distance and packing option.
Solar payback estimator (with explicit assumptions)
Roughly how many years a home solar PV system takes to pay for itself.
DPI calculator
Works out the DPI an image will print at, from its pixel width and print size.
Print-size calculator
Works out the largest size you can print an image at a chosen quality.
Download-time calculator
Estimates how long a download will take from the file size and connection speed.
GB/MB/TB converter
Converts a data amount between megabytes, gigabytes and terabytes.
Add/subtract days
Adds or subtracts a number of days from a date.
Days between dates
Works out exactly how many days are between two dates.
Browse by category
Build
Material, measurement and project tools for construction and DIY.
- Block quantity calculator
- Brick quantity calculator
- Concrete bag calculator
Cook
Cooking and baking conversion tools.
- Baking-pan area converter
- Cake-tin size converter
- Cups to grams by ingredient
dev
- Date String Portability Checker
- .env Portability Preflight
- Regex Portability Checker
Drive
Vehicle costs, EV charging, fuel and journey tools.
- Annual mileage cost
- Battery energy to range reverse estimator
- Diesel journey cost
Energy
Energy and appliance running-cost tools.
- Air-conditioner cost calculator
- Appliance running-cost calculator
- Battery runtime calculator
Events
Event and party planning tools.
- Cake servings calculator
- Catering portions estimator
- Chair quantity calculator
files
- EML/MIME Import Doctor
- Markdown Portability Preflight
- MIME Attachment Filename Doctor
Garden
Garden and landscaping material tools.
- Compost calculator
- Decking calculator
- Fence panel calculator
Home
Property and home-project budgeting tools.
- Extension rough-cost estimator
- Flooring budget estimator
- Heating-energy estimator
Image, printing and dimension tools.
- Aspect-ratio calculator
- DPI calculator
- Image-resize dimensions
Tech
Data, internet and technology tools.
- Audio file-size estimator
- Bitrate calculator
- Data-usage calculator
Time
Time and scheduling tools.
- Add/subtract days
- Break-time calculator
- Business days between dates
How PracticalBench tools work
Runs in your browser. Every calculator on this site computes locally — nothing you enter is uploaded, see our methodology.
Assumptions shown, not hidden. Every tool states what it assumes and what it doesn't cover.
Free, no account. No sign-up, no paywall to use a tool.