17 tables

Reference Tables

Browse Numbivo reference tables for technical lookup values, correction factors and quick checks. Use a calculator when your own inputs need to be processed.

Choose a reference table by the value you need to look up

Numbivo currently publishes reference tables across Home & Energy, Construction, Finance, Automotive and Business. Use a table when the main task is to find a factor, conversion, benchmark or ready-made comparison value. If your own inputs must be processed into a result, use the Calculators; for decision context use Guides; for structured fundamentals use the Academy.

Home & EnergyHeating and energy reference values

Look up radiator correction factors and other values used alongside household-energy calculations.

ConstructionMaterials, density, waste and units

Use density, rebar-weight, waste-allowance and construction-unit tables when checking takeoffs and orders.

FinanceInterest, loan, inflation and present-value factors

Compare factor tables for compounding, repayments, purchasing power, savings goals and discounted value.

AutomotiveFuel, EV, tyre and braking references

Convert fuel economy, compare charging time, inspect tyre-size references and check braking distance by speed.

BusinessMarkup, break-even and discount references

Use compact tables to compare markup versus margin, break-even revenue and the extra sales needed after a discount.

TablesRadiator Correction Factor Table – ΔT50, ΔT40, ΔT30

Quick-reference ΔT radiator correction factors for converting ΔT50 catalogue output to lower-temperature output and reverse sizing.

TablesBuilding Material Density Table – Bulk Density in kg/m³, t/m³ & lb/ft³

Typical construction material density ranges with unit conversions, material-state guidance and volume-to-mass examples.

TablesRebar Weight Table – kg/m, lb/ft, Bar Sizes & Stock Weights

Reference kg/m and lb/ft values for metric and US rebar, with stock weights, formulas, tonnage examples and takeoff checks.

TablesConstruction Material Waste Allowance Table – Percentages & Ordering Guide

Planning waste ranges for common construction materials, with formulas, package rounding, spare-stock guidance and examples.

TablesConstruction Unit Conversion Table – Length, Area, Volume & Weight

Quick construction unit conversions for measurements and material takeoffs.

TablesCompound Interest Table – Growth Factors by Rate & Year

Look up annual compound growth factors, end-of-year contribution factors, sample balances and exact or Rule-of-72 doubling times.

TablesPresent Value Factor Table – Discount & Annuity Factors

Look up PVIF and PVIFA discount factors, current values of future money and the effect of ordinary versus due annuity timing.

TablesLoan Payment Table – Monthly Payment per $1,000 Borrowed

Estimate principal-and-interest payments per $1,000 financed for terms from one to thirty years and compare the effect of rate and term.

TablesInflation Table – Future Prices & Purchasing Power by Year

Look up future prices, remaining purchasing power and cumulative inflation for common constant-rate scenarios from one to thirty years.

TablesSavings Goal Table – Monthly Savings per $10,000 Target

Look up the monthly end-of-period contribution needed for each $10,000 of target balance across common rates and terms from one to thirty years.

TablesFuel Economy Conversion Table – MPG, L/100 km & km/L

Look up common fuel economy conversions between L/100 km, kilometres per litre, US miles per gallon and Imperial miles per gallon.

TablesEV Charging Time Table – Battery Size & Charger Power

Compare ideal EV charging times by usable battery capacity, charge window and effective AC or DC charging power.

TablesBraking Distance by Speed Table – Thinking & Stopping

Check typical thinking, braking and total stopping distances by speed, with a separate metric model and reaction-time reference.

TablesTyre Size Reference Table – Diameter & Circumference

Check nominal dimensions for common R14 to R20 passenger-car tyres and learn how width, aspect ratio and rim diameter combine.

TablesMarkup to Margin Conversion Table – Markup vs Margin

Quick-reference markup-to-margin and margin-to-markup conversion table with formulas and $100-cost price examples.

TablesDiscount vs Required Sales Increase Table

Reference matrix showing the sales-volume increase required to offset discounts at different starting contribution margins.

TablesBreak-even Revenue Table – Fixed Costs & Contribution Margin

Reference tables for break-even revenue and units across common fixed-cost and contribution-margin scenarios.

What are Numbivo reference tables for?

A reference table is useful when the task is mainly to look up, compare or convert a known value. It should save time without hiding the assumptions behind the number. Numbivo therefore keeps lookup data on dedicated Table pages and leaves personalised arithmetic to calculators.

The current table library spans five topic areas and includes conversion tables, factor tables, planning ranges and scenario comparisons. Each detail page explains what the rows and columns mean, how to use the values and when a product-specific, project-specific or contractual source should take priority.

Construction reference tables

Construction tables help with the inputs that sit around a material calculation. The Building Material Density Table supports volume-to-mass checks, the Rebar Weight Table links bar diameter with mass per unit length, and the Construction Unit Conversion Table helps prevent mm, cm, m, ft and volume-unit mistakes.

The Construction Material Waste Allowance Table is different: it provides planning ranges and explains why waste allowance, package rounding and deliberate spare stock should not be treated as the same thing.

Finance reference tables

Finance tables are useful when you want to inspect how rate and time change a result before entering a personalised scenario. Numbivo includes tables for compound-interest factors, present-value factors, loan payment per 1,000, inflation and purchasing power, and monthly savings contributions.

These tables are comparison aids, not substitutes for a full cash-flow calculation when dates, fees, variable rates, taxes or irregular payments matter.

Automotive reference tables

The automotive set covers different lookup jobs: Fuel Economy Conversion compares L/100 km, km/L and MPG; EV Charging Time compares battery-energy and charger-power combinations; the Tyre Size Reference Table explains common tyre dimensions; and the Braking Distance by Speed Table shows how distance changes as speed rises under defined assumptions.

A lookup row should not be mistaken for a guarantee. Real charging power can taper, tyre fitment depends on the vehicle, and braking distance varies with tyres, road, weather, brakes and driver reaction.

Business reference tables

Business tables make related pricing measures easier to compare without repeatedly rebuilding the same scenario. The Markup–Margin Conversion Table shows why a 25% markup is not a 25% margin. The Break-even Revenue Table links contribution margin with the sales required to cover fixed cost, while the Discount Required Sales Increase Table illustrates how a price cut can require disproportionate extra volume to preserve gross profit.

Home & Energy reference data

The Radiator Output Correction Factor Table is used when a radiator output quoted at one reference temperature must be adjusted to another operating condition. It is a good example of why a table needs context: radiator ΔT is based on mean water temperature relative to room temperature and should not be confused with the flow-to-return temperature drop.

Table, calculator, Guide or Academy?

Use a Table when you already understand the quantity and need to look up a value. Use a Calculator when several user inputs must be processed into a result. Use a Guide when the main question is interpretation, comparison or workflow. Use the Academy when the underlying concepts need to be learned in sequence.

Keeping these roles separate prevents a table from becoming a second version of a calculator and makes it clearer when to look up a value and when to run a calculation.

How to use a technical table safely

  1. Identify the exact quantity. A factor, percentage, density, payment factor and conversion ratio are not interchangeable.
  2. Read the units. Check whether the value is per metre, per m², per m³, per 1,000, per month or another basis.
  3. Check the reference condition. Many table values only make sense under a stated rate, temperature, speed, term or product assumption.
  4. Prefer specific data when available. Manufacturer, supplier, lender, contract or project data should replace a generic planning value when the actual case is known.
  5. Use the table in the correct direction. Some rows are multipliers, others are divisors or comparison values. Follow the formula on the detail page.

What makes a useful Numbivo reference table?

The data should appear high on the page, the units and assumptions should be explicit, at least one worked example should show how a value is used, and the page should state where the lookup stops being sufficient. If the next step needs personal or project inputs, the table should lead to the appropriate calculator rather than pretending to provide a final answer.

FAQ – Reference Tables

What is a Numbivo Reference Table for?
It is for quick lookup, comparison or conversion when you already know which technical or financial quantity you need.
When should I use a table instead of a calculator?
Use a table when one lookup value is the main task. Use a calculator when several inputs must be combined into a personalised result.
Which topics are covered by Numbivo Tables?
The current library covers Home & Energy, Construction, Finance, Automotive and Business reference data.
Are table values universal?
No. Some values depend on a formula, reference condition, product, rate, time period or planning assumption. Read the notes on the detail page and prefer specific source data where available.
Can I use a table value for a final purchase or technical decision?
A table can support a check or estimate, but the final decision may require manufacturer data, supplier information, project documents, contracts or professional requirements.
Why do some tables link to calculators?
A table provides a lookup value; a calculator can then combine that value with your own inputs. Linking the two keeps each page focused on a distinct task.