Every profession's recurring calculations, now in your pocket. No paper, no cell references — just your formula. Save once, run forever.
VAT calculation, gross-to-net salary, depreciation, profit margin — every accountant's daily recurring operations. Save once, run for every client with the same formula.
?Gross Price (tax-incl.) [number] = gross_price
?VAT Rate (%) [number] = vat_rate
@VAT_Amount = gross_price * vat_rate / (100 + vat_rate)
#VAT Amount = @VAT_Amount
#Net Price (ex-VAT) = gross_price - @VAT_Amount
?Gross Salary [number] = gross
?Social Security Rate (%) [number] = ss_rate
?Income Tax Rate (%) [number] = tax_rate
@Social_Sec = gross * ss_rate / 100
@Taxable = gross - @Social_Sec
@Income_Tax = @Taxable * tax_rate / 100
#Social Security = @Social_Sec
#Income Tax = @Income_Tax
#Net Salary = gross - @Social_Sec - @Income_Tax
* Enter your applicable rates. Rates vary by country and income bracket.
?Cost Price [number] = cost
?Target Profit Margin (%) [number] = margin
#Selling Price = cost / (1 - margin / 100)
#Profit Amount = cost * margin / (100 - margin)
#Markup on Cost (%) = margin / (100 - margin) * 100
?Asset Value [number] = value
?Useful Life (Years) [number] = life
#Annual Depreciation = value / life
#Monthly Depreciation = value / life / 12
#Depreciation Rate (%) = 100 / life
Compound interest, loan repayment, return on investment — you don't have to rework the same financial logic from scratch each time.
?Principal [number] = principal
?Annual Interest Rate (%) [number] = rate
?Term (Years) [number] = years
@Balance = principal * POWER(1 + rate / 100, years)
#Total Balance = @Balance
#Interest Earned = @Balance - principal
#Growth Factor = POWER(1 + rate / 100, years)
?Loan Amount [number] = loan
?Monthly Interest Rate (%) [number] = monthly_rate
?Term (Months) [number] = term
@r = monthly_rate / 100
@Factor = POWER(1 + @r, term)
@Payment = loan * @r * @Factor / (@Factor - 1)
#Monthly Payment = @Payment
#Total Repayment = @Payment * term
#Total Interest = @Payment * term - loan
?Investment Amount [number] = investment
?Revenue Earned [number] = revenue
#ROI (%) = (revenue - investment) / investment * 100
#Net Profit / Loss = revenue - investment
Concrete volume, material quantities, floor tiling and paint calculations — instant results on site or with a client.
?Length (m) [number] = length
?Width (m) [number] = width
?Height (m) [number] = height
@Volume = length * width * height
#Concrete Volume (m³) = @Volume
#Cement Bags (50 kg) = CEILING(@Volume * 350 / 50)
#Sand (tonnes) = ROUND(@Volume * 0.7, 2)
* Based on C20 concrete mix ratios
?Room Length (m) [number] = length
?Room Width (m) [number] = width
?Waste Allowance (%) [number] = waste
@Net_Area = length * width
#Net Area (m²) = @Net_Area
#Material to Purchase (m²) = ROUND(@Net_Area * (1 + waste / 100), 2)
?Total Wall Area (m²) [number] = wall_area
?Doors & Windows Area (m²) [number] = openings
?Number of Coats [number] = coats
@Paintable_Area = wall_area - openings
#Paintable Area (m²) = @Paintable_Area
#Paint Required (litres) = CEILING(@Paintable_Area * coats / 12)
* 1 litre of paint ≈ 12 m² per coat
Torque, mechanical power, efficiency and pressure calculations — engineering equations now in your pocket, stepped and readable.
?Force (N) [number] = force
?Moment Arm (m) [number] = arm
?Rotational Speed (rpm) [number] = rpm
@Torque = force * arm
@Angular_Speed = rpm * 2 * 3.14159 / 60
#Torque (N·m) = @Torque
#Angular Speed (rad/s) = @Angular_Speed
#Mechanical Power (W) = @Torque * @Angular_Speed
?Input Power (W) [number] = input_power
?Output Power (W) [number] = output_power
#Efficiency (%) = output_power / input_power * 100
#Power Loss (W) = input_power - output_power
?Force (N) [number] = force
?Area (m²) [number] = area
#Pressure (Pa) = force / area
#Pressure (bar) = force / area / 100000
#Pressure (atm) = force / area / 101325
Quadratic equation roots, circle calculations, combinatorics — mathematical formulas in stepped, readable form.
?Coefficient a [number] = a
?Coefficient b [number] = b
?Coefficient c [number] = c
@Discriminant = b * b - 4 * a * c
#Discriminant (Δ) = @Discriminant
#x₁ = (-b + SQRT(@Discriminant)) / (2 * a)
#x₂ = (-b - SQRT(@Discriminant)) / (2 * a)
* Δ must be ≥ 0 (negative Δ yields no real roots)
?Radius (r) [number] = r
@PI = 3.14159265
#Area = @PI * r * r
#Circumference = 2 * @PI * r
#Diameter = 2 * r
?Total Elements (n) [number] = n
?Selected Elements (k) [number] = k
#C(n,k) = FACTORIAL(n) / (FACTORIAL(k) * FACTORIAL(n - k))
Distance between two points, slope gradient and angle, plot area — coordinate and measurement calculations, step by step.
?X1 Coordinate (m) [number] = x1
?Y1 Coordinate (m) [number] = y1
?X2 Coordinate (m) [number] = x2
?Y2 Coordinate (m) [number] = y2
@dx = x2 - x1
@dy = y2 - y1
#Distance (m) = SQRT(@dx * @dx + @dy * @dy)
?Horizontal Distance (m) [number] = horiz
?Vertical Height Difference (m) [number] = vert
@Slope_Ratio = vert / horiz
#Gradient (%) = @Slope_Ratio * 100
?Frontage (m) [number] = frontage
?Depth (m) [number] = depth
#Area (m²) = frontage * depth
#Area (acres) = frontage * depth / 4047
#Area (hectares) = frontage * depth / 10000
Moles and molecules, dilution calculations, pH — laboratory and field chemistry, step by step and error-proof.
?Mass of Substance (g) [number] = mass
?Molar Mass (g/mol) [number] = molar_mass
@Moles = mass / molar_mass
#Amount of Substance (mol) = @Moles
#Number of Molecules = @Moles * 6.022 * POWER(10, 23)
?Initial Concentration (mol/L) [number] = c1
?Initial Volume (mL) [number] = v1
?Target Concentration (mol/L) [number] = c2
#Required Final Volume (mL) = c1 * v1 / c2
#Water to Add (mL) = c1 * v1 / c2 - v1
?H⁺ Ion Concentration (mol/L) [number] = h_ion
#pH = -LOG10(h_ion)
#pOH = 14 + LOG10(h_ion)
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