Calculator Helper | Skills Pool
Calculator Helper Performs mathematical calculations and conversions. Use when user asks to "calculate", "compute", "what is the result of", "convert units", or needs math help.
majiayu000 4 stars Feb 5, 2026 Occupation Categories Documents Calculator Helper Skill
Automatically performs mathematical calculations, unit conversions, and numeric computations.
When to Use
This skill activates when the user needs mathematical help:
"Calculate 25% of 1500"
"What is 145 * 23?"
"Convert 100 kilometers to miles"
"What's the compound interest on $1000 at 5% for 3 years?"
Instructions
Step 1: Identify the Calculation Type
Determine what kind of calculation is needed:
Arithmetic : Basic operations (+, -, *, /)Percentages : Finding percentages, percentage changeUnit Conversions : Length, weight, temperature, timeFinancial : Interest, currency, profit marginsScientific : Powers, roots, logarithms
Quick Install
Calculator Helper npx skillvault add majiayu000/majiayu000-claude-skill-registry-data-data-calculator-helper-skill-md
stars 4
Updated Feb 5, 2026
Occupation
Date/Time : Time differences, date calculations
150 + 75 = 225
1000 - 234 = 766
45 * 12 = 540
100 / 4 = 25
25% of 200 = 50
200 increased by 15% = 230
Change from 50 to 75 = 50% increase
15 is what % of 60? = 25%
Common conversions:
- 1 mile = 1.60934 kilometers
- 1 pound = 0.453592 kilograms
- 1 inch = 2.54 centimeters
- Celsius to Fahrenheit: (C × 9/5) + 32
- Fahrenheit to Celsius: (F - 32) × 5/9
Simple Interest: Principal × Rate × Time
Compound Interest: Principal × (1 + Rate)^Time
Percentage Profit: (Profit / Cost) × 100
Step 3: Show Clear Working
Understanding : Restate the problemFormula : Show the formula used (if applicable)Calculation : Step-by-step workingResult : Clear final answer with units
Round to appropriate decimal places (usually 2 for money, 2-4 for measurements)
Include units in the answer
Double-check the math
Provide context if helpful
Examples
Example 1: Basic Calculation User: "What is 15% of 850?"
Calculating 15% of 850:
Method: (15/100) × 850
= 0.15 × 850
= 127.50
Answer: 127.50
Example 2: Unit Conversion User: "Convert 75 degrees Fahrenheit to Celsius"
Converting 75°F to Celsius:
Formula: (F - 32) × 5/9
= (75 - 32) × 5/9
= 43 × 5/9
= 215/9
= 23.89°C
Answer: 75°F = 23.89°C (approximately 24°C)
Example 3: Financial Calculation User: "If I invest $5000 at 6% compound interest for 3 years, how much will I have?"
Calculating compound interest:
Given:
- Principal (P) = $5,000
- Annual Rate (r) = 6% = 0.06
- Time (t) = 3 years
Formula: A = P(1 + r)^t
= 5000(1 + 0.06)^3
= 5000(1.06)^3
= 5000 × 1.191016
= $5,955.08
Answer: After 3 years, you'll have $5,955.08
Interest earned: $955.08
Example 4: Complex Calculation User: "My recipe serves 4 but I need it for 7 people. It calls for 2.5 cups of flour. How much do I need?"
Scaling recipe from 4 to 7 people:
Scale factor: 7 ÷ 4 = 1.75
Original flour: 2.5 cups
Scaled flour: 2.5 × 1.75 = 4.375 cups
Answer: You need 4.375 cups of flour (approximately 4⅜ cups)
Tip: This is closest to 4.5 cups (4½ cups) for easier measuring.
Example 5: Percentage Change User: "Sales went from 1,200 to 1,650. What's the percentage increase?"
Calculating percentage change:
Original: 1,200
New: 1,650
Change: 1,650 - 1,200 = 450
Formula: (Change / Original) × 100
= (450 / 1,200) × 100
= 0.375 × 100
= 37.5%
Answer: 37.5% increase in sales
Common Conversions Reference
Length
1 inch = 2.54 cm
1 foot = 30.48 cm
1 yard = 0.9144 m
1 mile = 1.60934 km
Weight
1 ounce = 28.3495 g
1 pound = 453.592 g
1 ton (US) = 907.185 kg
Volume
1 fluid oz (US) = 29.5735 ml
1 cup = 236.588 ml
1 pint (US) = 473.176 ml
1 gallon (US) = 3.78541 L
Temperature
C to F: (C × 9/5) + 32
F to C: (F - 32) × 5/9
C to K: C + 273.15
Tips
For Accuracy
Use enough decimal places during calculation
Round only the final answer
State assumptions (e.g., "assuming 365 days/year")
For Clarity
Show your working
Label all values with units
Explain the formula if it's not obvious
Provide context for the result
For Usefulness
Suggest rounded practical values when appropriate
Point out if the result seems unusual
Offer related calculations if helpful
Common Calculation Types
Business/Finance
Profit margins
Discounts and markups
ROI (Return on Investment)
Break-even analysis
Percentage of total
Science/Engineering
Scientific notation
Unit conversions
Area and volume
Speed and velocity
Density calculations
Everyday Math
Tips and splitting bills
Recipe scaling
Time zone conversions
Age calculations
Date differences
Remember
Double-check : Math errors are easy to makeShow working : Help users understand the processUse appropriate precision : Don't over-specify (e.g., $5.00 not $5.0000000)Include units : Always show what you're measuringProvide context : Explain if a result is unusually high/low 02
When to Use