What the calculator is for
The Calculadora de intervalo de revisión gives you an estimate of how often a given garden tool needs proper attention, whether that is sharpening a blade, oiling a hinge, or having a power tool looked at by someone qualified. You tell it how the tool is used and stored, and it returns a rough interval rather than a fixed date, because two spades bought on the same day can wear at very different rates depending on the soil behind them and the shed they live in.
Why one interval never fits every tool
A forged steel spade used weekly on heavy clay will blunt and pit faster than the same spade used twice a season on a well-drained allotment, because clay is abrasive and holds moisture against the blade long after you have finished digging. Stainless steel resists that corrosion better than carbon steel, but it is not immune, and a tool left damp in a corner will still need attention sooner than one that is wiped down and hung up. Power tools add another layer: a petrol strimmer needs its air filter and spark plug checked on a schedule that has nothing to do with how often you sharpen a hoe. The calculator is built to reflect these differences rather than hand out the same six-month reminder to everyone.
What the calculator asks you for
To produce a useful estimate, it needs a handful of details about the tool and how you actually use it:
- The type of tool, since a border spade, a pair of secateurs, and a petrol hedge trimmer wear in different ways
- The material, because carbon steel, stainless steel, and powder-coated finishes each have different tolerances for damp and neglect
- How often you use it through the growing season
- Where and how you store it, since a damp shed does more damage than a dry one
- Whether it runs on petrol, mains power, or battery, for anything with a motor
From those answers it works out a rough interval for sharpening, oiling, or a fuller inspection, and flags anything that looks overdue based on what you have entered.
Reading the result without over-trusting it
The number the calculator gives you is a starting point, not a verdict, and it can be wrong if the details you enter do not quite match reality or if a tool has had a harder season than usual. A spade that hit a run of flint and stone needs a look sooner than the calendar suggests, whatever the estimate says. Treat the result as a prompt to go and check the tool yourself, feeling for a burr on the edge or grit in a hinge.
Fitting servicing into the gardening year
Most of this work sits naturally around the edges of the season. Fewer gardeners feel like stopping to sharpen a hoe in June, but autumn clearance and the quiet weeks before spring are exactly when tools are idle enough to go over properly. The seasonal tool planner lays out what typically needs doing and when across the UK gardening calendar, and it pairs well with the interval estimates here if you want to batch the work rather than chase individual reminders. For the actual techniques involved, from removing rust to re-oiling a wooden handle, the tool care and maintenance guide covers the steps in more detail than a calculator result can.
When the interval says replace
Sometimes what the calculator flags as overdue is really a sign that a tool has reached the end of what sharpening or oiling can fix, particularly with a stamped blade that has been reground several times and is now too thin to hold an edge. In that case the sensible move is to price up a replacement for something that is on its way out. The tool finder is a reasonable place to start if you are not sure what you actually need to replace a tool that has done its job and is now past helping.