Calculator Trust Guide
How to use Ask Uncle G calculators wisely without treating estimates as guarantees.
Calculators can be confusing — especially when results look similar even after changing inputs. This guide explains what the numbers mean and when to trust them.
Trust Principles
1. Measure carefully
Small measurement errors multiply through the calculation. Remeasure before you rely on a result.
2. Recalculate after changing inputs
If a result is already showing and you change any number, the result may be stale. Click Recalculate to update it.
3. Read the explanation, not just the final number
The breakdown table, raw number, and explanation panel tell more than the single rounded result.
4. Use raw numbers and rounded numbers together
Raw gallons of 1.99 and 2.05 both round to 2, but they represent different situations. Both numbers matter.
5. Add reasonable waste where appropriate
Waste factors account for cuts, breakage, and layout. Not adding waste can leave you short.
6. Verify product labels
Coverage rates, bag yields, and material quantities vary by brand, surface, and conditions. Always check the label.
7. Ask qualified professionals for safety-critical work
Structural, electrical, plumbing, gas, permit-required, and public-infrastructure work requires professional judgment.
8. Do not treat calculator output as approval
Calculator output is a planning estimate — not a permit, not a code review, not a structural design, and not a contractor recommendation.
What Recalculate Means
- ▸If a result is already showing and you change any input, the displayed result may be stale — it reflects the old inputs, not your new ones.
- ▸The 'Inputs changed' banner tells you the result needs updating before you can trust it.
- ▸The Recalculate button (with the refresh icon) updates the result using the newest inputs you entered.
- ▸After clicking Recalculate, the banner disappears — confirming the result now matches the current inputs.
- ▸This protects you from accidentally trusting old numbers after making a change.
- ▸Always click Recalculate before copying, printing, or acting on a result after changing any input.
What the Calculators Do NOT Do
- Do not guarantee exact material quantities
- Do not price projects or give cost estimates
- Do not recommend stores, brands, or products
- Do not verify contractors or professionals
- Do not give permit, code, or inspection advice
- Do not give structural engineering advice
- Do not provide installation instructions
- Do not replace qualified professional judgment
- Do not save user project data
- Do not submit anything to any government, contractor, or authority
When to Call Qualified Help
- ▸Gas smell — evacuate and call your gas company or emergency services immediately
- ▸Sparks, burning smell, or electrical issues — do not touch, call a licensed electrician
- ▸Water near electricity — stop, do not enter, call a licensed electrician
- ▸Structural movement, cracking, or settling — call a licensed structural engineer
- ▸Mold, sewage, or biohazard — do not disturb, call a licensed remediation professional
- ▸Public sidewalks, aprons, or access routes — contact your municipality
- ▸Driveways — structural design, drainage, permits, and codes require a qualified contractor
- ▸Electrical, plumbing, HVAC, or roof work — requires licensed professionals in most jurisdictions
- ▸Medical or emergency concerns — call 911 or your local emergency number
Future Features — Not Yet Built
These are future ideas. They are clearly marked as not built. No claim is made that they exist today.
- →Metric / imperial measurement toggle for calculators
- →International measurement support
- →Unit conversion support for paint and concrete calculators
- →Printable calculator result packs with saved layouts
- →More example comparisons for additional project types
- →Broader public user testing before sponsor outreach