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Percentage Calculator

The complete toolkit for all your percentage calculations

Difference %

Example: Between 100 and 120 = 20%

Variation %

Example : 100 Β±10% = 110 or 90

Simple variation

Example: 200 β†’ 250 = +25%

Value in %

Example: 100 = 10% of 1000

Coefficient Γ—

Example: 1000 = 100 Γ— 10

Before addition

Example: 110+10% = 100 Before addition

Before discount

Example: 100 before -10% = 90

Addition %

Example: 100+10% = 110

Deduction %

Example: 100-10% = 110

πŸ’‘ Calculations with VAT Included or without VAT

πŸ”’ Pre-tax β†’ Tax-inclusive

100€ Ex. VAT + 10% of taxes = 110€ Inc. VAT
+10% of taxes of 100€ Ex. VAT = 10€ of taxes

πŸ”’ Tax-inclusive β†’ Pre-tax

110€ Inc. VAT with 10% of taxes = 100€ Ex. VAT
110€ Inc. VAT - 100€ Ex. VAT = 10€ of taxes

🏷️ Practical discount calculation examples

πŸ”» Apply a discount

150€ - 20% of discount = 120€
discount of 20% on 150€ = 30€ of savings
You save 30€ thanks to this discount

πŸ” Find the original price

120€ after 20% of discount = 150€ original price
original price 150€ - 30€ discount = 120€
The discount was 30€

🎯 Cascade discounts (example)

Initial price
200€
1st discount (-30%)
140€
(-60€)
2nd discount (-10%)
126€
(-14€)
πŸ’‘ Total savings : 74€ (37% of initial price)

πŸ“ Remember : Cascade discounts don't add up! A 30% then 10% discount β‰  40% total discount. Each discount applies to the already reduced price.

⚑ SLA (Service Level Agreement) calculation examples

βœ… Calculate uptime

8736h uptime / 8760h total = 99.73% availability
Downtime : 24h (0.27%)
Good SLA level, satisfactory availability

⏱️ Allowed downtime

8760h total period Γ— 0.1% Allowed downtime = 8.76h max downtime
max downtime : 526 minutes / 0.4 days
Downtime budget: 8.76h per year

πŸ“Š Standard SLA levels (per year)

99%
87.6h/an
Basic
99.9%
8.76h/an
Good
99.99%
52.6min/an
Excellent
99.999%
5.3min/an
Exceptional

πŸ”§ Technical note : SLA measures service availability. The higher the percentage, the less downtime is allowed. A 99.9% SLA only permits 8h45 of downtime per year!

Professional calculator - All your percentage calculations in one click

Understanding Percentages

A simple and practical guide to master all percentage calculations

What is a percentage?

A percentage is a way to represent a fraction of a quantity relative to a hundred. It's a way to compare a part to a whole, noted with the "%" symbol.

πŸ’‘ Concrete example:

If you get 80% on a test, it means you got 80 points out of 100 possible.

Difference between two numbers

Formula:

(Number 1 Γ· Number 2) Γ— 100

Example:

20 Γ· 80 = 0.25 0.25 Γ— 100 = 25% 20 therefore corresponds to 25% of 80

Multiplier coefficient

Formula:

Number 1 Γ· Number 2 = coefficient

Example:

25 Γ· 50 = 0.5 Verification: 50 Γ— 0.5 = 25 βœ“

Reduction calculations (sales)

πŸ“‰ Price after reduction

Formula:

Price A Γ— (1 - percentage/100)

Example:

€50 with 10% discount €50 Γ— (1 - 10/100) = €50 Γ— 0.9 = €45

πŸ“ˆ Price before reduction

Formula:

Price B Γ· (1 - percentage/100)

Example:

€45 after 10% discount €45 Γ· (1 - 10/100) = €45 Γ· 0.9 = €50

Why are percentages important?

πŸ’° Finance

Calculating discounts, interest, price increases, investments

πŸ”¬ Sciences

Representing proportions, growth rates, statistics

πŸŽ“ Education

Performance grading, calculating averages, evaluations

Conclusion

Percentage is a powerful mathematical tool for representing fractions relative to a hundred. Mastering percentage calculations is an essential skill that allows you to better manage your finances, interpret data and make informed decisions in daily life.