Every calculator, planner and reference page published on The Useful Site, grouped by subject. There are 305 tools across eleven subjects, each listed once.

There is one guide as well — long-form explanations rather than calculators. Browse the guides.

For a quicker route, use the search box at the top of any page, or open the full search page and describe the problem you are trying to solve.

Technology 28 tools

Storage, networking, Windows, backups and practical IT tools.

Home & DIY 42 tools

Materials, measurements, decorating and household project planning.

Finance & Budgeting 50 tools

Savings, borrowing, household costs and everyday money decisions.

Gardening 28 tools

Soil, planting, water, compost and garden project calculations.

Food & Drink 9 tools

Oven settings, roasting times, conversions, scaling and quantities for a crowd.

Travel & Transport 25 tools

Journey times, fuel, luggage, parking and holiday planning.

Health & Wellbeing 26 tools

Everyday health estimates with clear limits and sensible guidance.

Hobbies & Interests 22 tools

Scale models, 3D printing, photography, astronomy and collections.

Yarn & Needlecraft 14 tools

Knitting, crochet, cross stitch and embroidery quantities, gauge and sizing.

Everyday Life 29 tools

Small calculations that make ordinary decisions easier.

Forensic Science 31 tools

Educational pathology, entomology and crime-scene calculation tools.

Writing & Self-Publishing 1 tool

Site information

AboutWho built the site and why it exists. My PromiseThe standards applied across the site. ContactSuggestions, corrections and feedback. Suggest a ToolTell me what is missing from the site. Editorial PolicyHow content is written, checked and maintained. Research & TestingHow calculations are researched and verified. References & SourcesThe published material behind the calculations. AccessibilityMy accessibility commitments and known limits. PrivacyWhat the site does and does not collect, and why. Terms of useThe terms under which the tools and guidance are provided. DisclaimerThe limits of every estimate on the site. Privacy PolicyHow site and advertising data are handled. Cookie PolicyWhich cookies are set and why. Terms of UseThe conditions for using the site.
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