Linear Interpolation is a very efficient and useful technique to get a required data from a limited source of data. In Civil Engineering we have to deal with a lot of calculations like minimum thickness table in Reinforced concrete structures, in Structural Number Calculation in Transportation engineering and so many.

 linear interpolation calculation tool

Linear interpolation is a technique of curve fitting in which if a straight line is faced, one can easy find the various points on that line.

### What is Interpolation

This tool is provided specially for civil engineers, to help them in their estimation work and in the various civil engineering calculation.

### Linear Interpolation Calculation

/** the form elements **/
#hongkiat-form { box-sizing: border-box; }
#hongkiat-form .txtinput {
display: block;
font-family: “Helvetica Neue”, Arial, sans-serif;
border-style: solid;
border-width: 1px;
border-color: #dedede;
margin-bottom: 20px;
font-size: 14px;
width:100px;
color: #777;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-webkit-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-moz-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-o-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
}
#hongkiat-form .txtinput:focus {
color: #333;
border-color: rgba(41, 92, 161, 0.4);
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(41, 92, 161, 0.6);
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-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(41, 92, 161, 0.6);
outline: 0 none;
}
#hongkiat-form input#name {
background: #fff url(‘images/user.png’) 5px 4px no-repeat;
}
#hongkiat-form input#email {
background: #fff url(‘images/email.png’) 5px 4px no-repeat;
}
#hongkiat-form input#website {
background: #fff url(‘images/website.png’) 5px 4px no-repeat;
}
#hongkiat-form input#telephone {
background: #fff url(‘images/phone.png’) 5px 4px no-repeat;
}
#hongkiat-form textarea {
display: block;
font-family: “Helvetica Neue”, Arial, sans-serif;
border-style: solid;
border-width: 1px;
border-color: #dedede;
margin-bottom: 15px;
font-size: 1.5em;
width: 90%;
height: 180px;
color: #777;
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
-moz-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset;
transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-webkit-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-moz-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
-o-transition: border 0.15s linear 0s, box-shadow 0.15s linear 0s, color 0.15s linear 0s;
}
#hongkiat-form textarea:focus {
color: #333;
border-color: rgba(41, 92, 161, 0.4);
box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(40, 90, 160, 0.6);
-moz-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(40, 90, 160, 0.6);
-webkit-box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) inset, 0 0 8px rgba(40, 90, 160, 0.6);
outline: 0 none;
}
#hongkiat-form textarea.txtblock {
background: #fff url(‘images/speech.png’) 5px 4px no-repeat;
}
#hongkiat-form #slider { width: 60%; }
#hongkiat-form #aligned {
box-sizing: border-box;
float: left;
width: 450px;
margin-right: 50px;
}
#hongkiat-form #aside {
float: left;
width: 250px;
box-sizing: border-box;
}
#wrapping { width: 100%; box-sizing: border-box; }
font-size: 17px;
color: #676767;
border: 1px solid #aaa;
width: 200px;
}
/** custom buttons **/
#buttons { display: block; padding-top: 10px; }
#buttons #resetbtn {
display: block;
float: left;
color: #515151;
margin-right: 20px;
height: 3em;
outline: 0;
font-weight: bold;
font-size: 1.3em;
white-space: nowrap;
word-wrap: normal;
vertical-align: middle;
cursor: pointer;
background-color: #fff;
background-image: -moz-linear-gradient(top, rgb(255,255,255) 2%, rgb(240,240,240) 2%, rgb(222,222,222) 100%);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(2%,rgb(255,255,255)), color-stop(2%,rgb(240,240,240)), color-stop(100%,rgb(222,222,222)));
background-image: -webkit-linear-gradient(top, rgb(255,255,255) 2%,rgb(240,240,240) 2%,rgb(222,222,222) 100%);
background-image: -o-linear-gradient(top, rgb(255,255,255) 2%,rgb(240,240,240) 2%,rgb(222,222,222) 100%); background-image: -ms-linear-gradient(top, rgb(255,255,255) 2%,rgb(240,240,240) 2%,rgb(222,222,222) 100%);
background-image: linear-gradient(top, rgb(255,255,255) 2%,rgb(240,240,240) 2%,rgb(222,222,222) 100%);
border: 1px solid #969696;
box-shadow: 0 1px 2px rgba(144, 144, 144, 0.4);
-moz-box-shadow: 0 1px 2px rgba(144, 144, 144, 0.4);
-webkit-box-shadow: 0 1px 2px rgba(144, 144, 144, 0.4);
text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
}
#buttons #resetbtn:hover {
text-shadow: 0 1px 1px rgba(255, 255, 255, 0.75);
color: #818181;
background-color: #fff;
background-image: -moz-linear-gradient(top, rgb(255,255,255) 2%, rgb(244,244,244) 2%, rgb(229,229,229) 100%);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(2%,rgb(255,255,255)), color-stop(2%,rgb(244,244,244)), color-stop(100%,rgb(229,229,229)));
background-image: -webkit-linear-gradient(top, rgb(255,255,255) 2%,rgb(244,244,244) 2%,rgb(229,229,229) 100%);background-image: -o-linear-gradient(top, rgb(255,255,255) 2%,rgb(244,244,244) 2%,rgb(229,229,229) 100%); background-image: -ms-linear-gradient(top, rgb(255,255,255) 2%,rgb(244,244,244) 2%,rgb(229,229,229) 100%); background-image: linear-gradient(top, rgb(255,255,255) 2%,rgb(244,244,244) 2%,rgb(229,229,229) 100%);
border-color: #aeaeae;
box-shadow: inset 0 1px 0 rgba(256,256,256,0.4),0 1px 3px rgba(0,0,0,0.5);
}
#submitbtn {
display: block;
float: left;
height: 3em;
border: 1px solid;
outline: 0;
font-weight: bold;
font-size: 14px;
color: #fff;
white-space: nowrap;
word-wrap: normal;
vertical-align: middle;
cursor: pointer;
border-color: #5e890a #5e890a #000;
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-ms-box-shadow: inset 0 1px 0 rgba(256,256,256, .35);
-webkit-box-shadow: inset 0 1px 0 rgba(256,256,256, .35);
box-shadow: inset 0 1px 0 rgba(256,256,256, .35);
background-color: rgb(226,238,175);
background-image: -moz-linear-gradient(top, rgb(226,238,175) 3%, rgb(188,216,77) 3%, rgb(144,176,38) 100%);
background-image: -webkit-gradient(linear, left top, left bottom, color-stop(3%,rgb(226,238,175)), color-stop(3%,rgb(188,216,77)), color-stop(100%,rgb(144,176,38)));
background-image: -webkit-linear-gradient(top, rgb(226,238,175) 3%,rgb(188,216,77) 3%,rgb(144,176,38) 100%);
background-image: -o-linear-gradient(top, rgb(226,238,175) 3%,rgb(188,216,77) 3%,rgb(144,176,38) 100%);
background-image: -ms-linear-gradient(top, rgb(226,238,175) 3%,rgb(188,216,77) 3%,rgb(144,176,38) 100%);
background-image: linear-gradient(top, rgb(226,238,175) 3%,rgb(188,216,77) 3%,rgb(144,176,38) 100%);
}
#submitbtn:hover, #submitbtn:active {
border-color: #7c9826 #7c9826 #000;
color: #fff;
-moz-box-shadow: inset 0 1px 0 rgba(256,256,256,0.4),0 1px 3px rgba(0,0,0,0.5);
-ms-box-shadow: inset 0 1px 0 rgba(256,256,256,0.4),0 1px 3px rgba(0,0,0,0.5);
-webkit-box-shadow: inset 0 1px 0 rgba(256,256,256,0.4),0 1px 3px rgba(0,0,0,0.5);
box-shadow: inset 0 1px 0 rgba(256,256,256,0.4),0 1px 3px rgba(0,0,0,0.5);
background: rgb(228,237,189);
background: -moz-linear-gradient(top, rgb(228,237,189) 2%, rgb(207,219,120) 3%, rgb(149,175,54) 100%);
background: -webkit-gradient(linear, left top, left bottom, color-stop(2%,rgb(228,237,189)), color-stop(3%,rgb(207,219,120)), color-stop(100%,rgb(149,175,54)));
background: -webkit-linear-gradient(top, rgb(228,237,189) 2%,rgb(207,219,120) 3%,rgb(149,175,54) 100%);
background: -o-linear-gradient(top, rgb(228,237,189) 2%,rgb(207,219,120) 3%,rgb(149,175,54) 100%); background: -ms-linear-gradient(top, rgb(228,237,189) 2%,rgb(207,219,120) 3%,rgb(149,175,54) 100%); background: linear-gradient(top, rgb(228,237,189) 2%,rgb(207,219,120) 3%,rgb(149,175,54) 100%);